Content-Security-Policy: default-src 'none' Content-Type: text/plain; charset=UTF-8 Content-Length: 34025 Content-Disposition: inline; filename="tclUnixInit.c" Last-Modified: Fri, 19 Jul 2024 06:07:03 GMT Expires: Mon, 17 Jul 2034 06:07:03 GMT ETag: "f2918d702804116012bb4ea1271f731dd44b084e" /* * tclUnixInit.c -- * * Contains the Unix-specific interpreter initialization functions. * * Copyright (c) 1995-1997 Sun Microsystems, Inc. * Copyright (c) 1999 by Scriptics Corporation. * All rights reserved. * * RCS: @(#) $Id: tclUnixInit.c,v 1.34.2.16 2009/10/05 02:41:18 das Exp $ */ #if defined(HAVE_COREFOUNDATION) #include #endif #include "tclInt.h" #include "tclPort.h" #include #ifdef HAVE_LANGINFO # include # ifdef __APPLE__ # if defined(HAVE_WEAK_IMPORT) && MAC_OS_X_VERSION_MIN_REQUIRED < 1030 /* Support for weakly importing nl_langinfo on Darwin. */ # define WEAK_IMPORT_NL_LANGINFO extern char *nl_langinfo(nl_item) WEAK_IMPORT_ATTRIBUTE; # endif # endif #endif #if defined(__FreeBSD__) && defined(__GNUC__) # include #endif #if defined(__bsdi__) # include # if _BSDI_VERSION > 199501 # include # endif #endif /* * The Init script (common to Windows and Unix platforms) is * defined in tkInitScript.h */ #include "tclInitScript.h" /* Used to store the encoding used for binary files */ static Tcl_Encoding binaryEncoding = NULL; /* Has the basic library path encoding issue been fixed */ static int libraryPathEncodingFixed = 0; /* * Tcl tries to use standard and homebrew methods to guess the right * encoding on the platform. However, there is always a final fallback, * and this value is it. Make sure it is a real Tcl encoding. */ #ifndef TCL_DEFAULT_ENCODING #define TCL_DEFAULT_ENCODING "iso8859-1" #endif /* * Default directory in which to look for Tcl library scripts. The * symbol is defined by Makefile. */ static char defaultLibraryDir[sizeof(TCL_LIBRARY)+200] = TCL_LIBRARY; /* * Directory in which to look for packages (each package is typically * installed as a subdirectory of this directory). The symbol is * defined by Makefile. */ static char pkgPath[sizeof(TCL_PACKAGE_PATH)+200] = TCL_PACKAGE_PATH; /* * The following table is used to map from Unix locale strings to * encoding files. If HAVE_LANGINFO is defined, then this is a fallback * table when the result from nl_langinfo isn't a recognized encoding. * Otherwise this is the first list checked for a mapping from env * encoding to Tcl encoding name. */ typedef struct LocaleTable { CONST char *lang; CONST char *encoding; } LocaleTable; static CONST LocaleTable localeTable[] = { #ifdef HAVE_LANGINFO {"gb2312-1980", "gb2312"}, {"ansi-1251", "cp1251"}, /* Solaris gets this wrong. */ #ifdef __hpux {"SJIS", "shiftjis"}, {"eucjp", "euc-jp"}, {"euckr", "euc-kr"}, {"euctw", "euc-cn"}, {"greek8", "cp869"}, {"iso88591", "iso8859-1"}, {"iso88592", "iso8859-2"}, {"iso88595", "iso8859-5"}, {"iso88596", "iso8859-6"}, {"iso88597", "iso8859-7"}, {"iso88598", "iso8859-8"}, {"iso88599", "iso8859-9"}, {"iso885915", "iso8859-15"}, {"roman8", "iso8859-1"}, {"tis620", "tis-620"}, {"turkish8", "cp857"}, {"utf8", "utf-8"}, #endif /* __hpux */ #endif /* HAVE_LANGINFO */ {"ja_JP.SJIS", "shiftjis"}, {"ja_JP.EUC", "euc-jp"}, {"ja_JP.eucJP", "euc-jp"}, {"ja_JP.JIS", "iso2022-jp"}, {"ja_JP.mscode", "shiftjis"}, {"ja_JP.ujis", "euc-jp"}, {"ja_JP", "euc-jp"}, {"Ja_JP", "shiftjis"}, {"Jp_JP", "shiftjis"}, {"japan", "euc-jp"}, #ifdef hpux {"japanese", "shiftjis"}, {"ja", "shiftjis"}, #else {"japanese", "euc-jp"}, {"ja", "euc-jp"}, #endif {"japanese.sjis", "shiftjis"}, {"japanese.euc", "euc-jp"}, {"japanese-sjis", "shiftjis"}, {"japanese-ujis", "euc-jp"}, {"ko", "euc-kr"}, {"ko_KR", "euc-kr"}, {"ko_KR.EUC", "euc-kr"}, {"ko_KR.euc", "euc-kr"}, {"ko_KR.eucKR", "euc-kr"}, {"korean", "euc-kr"}, {"ru", "iso8859-5"}, {"ru_RU", "iso8859-5"}, {"ru_SU", "iso8859-5"}, {"zh", "cp936"}, {"zh_CN.gb2312", "euc-cn"}, {"zh_CN.GB2312", "euc-cn"}, {"zh_CN.GBK", "euc-cn"}, {"zh_TW.Big5", "big5"}, {"zh_TW", "euc-tw"}, {NULL, NULL} }; #ifdef HAVE_COREFOUNDATION static int MacOSXGetLibraryPath _ANSI_ARGS_(( Tcl_Interp *interp, int maxPathLen, char *tclLibPath)); #endif /* HAVE_COREFOUNDATION */ #if defined(__APPLE__) && (defined(TCL_LOAD_FROM_MEMORY) || ( \ defined(MAC_OS_X_VERSION_MIN_REQUIRED) && ( \ (defined(TCL_THREADS) && MAC_OS_X_VERSION_MIN_REQUIRED < 1030) || \ (defined(__LP64__) && MAC_OS_X_VERSION_MIN_REQUIRED < 1050) || \ (defined(HAVE_COREFOUNDATION) && MAC_OS_X_VERSION_MIN_REQUIRED < 1050)\ ))) /* * Need to check Darwin release at runtime in tclUnixFCmd.c and tclLoadDyld.c: * initialize release global at startup from uname(). */ #define GET_DARWIN_RELEASE 1 long tclMacOSXDarwinRelease = 0; #endif /* *--------------------------------------------------------------------------- * * TclpInitPlatform -- * * Initialize all the platform-dependant things like signals and * floating-point error handling. * * Called at process initialization time. * * Results: * None. * * Side effects: * None. * *--------------------------------------------------------------------------- */ void TclpInitPlatform() { tclPlatform = TCL_PLATFORM_UNIX; /* * Make sure, that the standard FDs exist. [Bug 772288] */ if (TclOSseek(0, (Tcl_SeekOffset) 0, SEEK_CUR) == -1 && errno == EBADF) { open("/dev/null", O_RDONLY); } if (TclOSseek(1, (Tcl_SeekOffset) 0, SEEK_CUR) == -1 && errno == EBADF) { open("/dev/null", O_WRONLY); } if (TclOSseek(2, (Tcl_SeekOffset) 0, SEEK_CUR) == -1 && errno == EBADF) { open("/dev/null", O_WRONLY); } /* * The code below causes SIGPIPE (broken pipe) errors to * be ignored. This is needed so that Tcl processes don't * die if they create child processes (e.g. using "exec" or * "open") that terminate prematurely. The signal handler * is only set up when the first interpreter is created; * after this the application can override the handler with * a different one of its own, if it wants. */ #ifdef SIGPIPE (void) signal(SIGPIPE, SIG_IGN); #endif /* SIGPIPE */ #if defined(__FreeBSD__) && defined(__GNUC__) /* * Adjust the rounding mode to be more conventional. Note that FreeBSD * only provides the __fpsetreg() used by the following two for the GNU * Compiler. When using, say, Intel's icc they break. (Partially based on * patch in BSD ports system from root@celsius.bychok.com) */ fpsetround(FP_RN); fpsetmask(0L); #endif #if defined(__bsdi__) && (_BSDI_VERSION > 199501) /* * Find local symbols. Don't report an error if we fail. */ (void) dlopen (NULL, RTLD_NOW); /* INTL: Native. */ #endif #ifdef GET_DARWIN_RELEASE { struct utsname name; if (!uname(&name)) { tclMacOSXDarwinRelease = strtol(name.release, NULL, 10); } } #endif } /* *--------------------------------------------------------------------------- * * TclpInitLibraryPath -- * * Initialize the library path at startup. We have a minor * metacircular problem that we don't know the encoding of the * operating system but we may need to talk to operating system * to find the library directories so that we know how to talk to * the operating system. * * We do not know the encoding of the operating system. * We do know that the encoding is some multibyte encoding. * In that multibyte encoding, the characters 0..127 are equivalent * to ascii. * * So although we don't know the encoding, it's safe: * to look for the last slash character in a path in the encoding. * to append an ascii string to a path. * to pass those strings back to the operating system. * * But any strings that we remembered before we knew the encoding of * the operating system must be translated to UTF-8 once we know the * encoding so that the rest of Tcl can use those strings. * * This call sets the library path to strings in the unknown native * encoding. TclpSetInitialEncodings() will translate the library * path from the native encoding to UTF-8 as soon as it determines * what the native encoding actually is. * * Called at process initialization time. * * Results: * Return 1, indicating that the UTF may be dirty and require "cleanup" * after encodings are initialized. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int TclpInitLibraryPath(path) CONST char *path; /* Path to the executable in native * multi-byte encoding. */ { #define LIBRARY_SIZE 32 Tcl_Obj *pathPtr, *objPtr; CONST char *str; Tcl_DString buffer, ds; int pathc; CONST char **pathv; char installLib[LIBRARY_SIZE], developLib[LIBRARY_SIZE]; Tcl_DStringInit(&ds); pathPtr = Tcl_NewObj(); /* * Initialize the substrings used when locating an executable. The * installLib variable computes the path as though the executable * is installed. The developLib computes the path as though the * executable is run from a develpment directory. */ sprintf(installLib, "lib/tcl%s", TCL_VERSION); sprintf(developLib, "tcl%s/library", TCL_PATCH_LEVEL); /* * Look for the library relative to default encoding dir. */ str = Tcl_GetDefaultEncodingDir(); if ((str != NULL) && (str[0] != '\0')) { objPtr = Tcl_NewStringObj(str, -1); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); } /* * Look for the library relative to the TCL_LIBRARY env variable. * If the last dirname in the TCL_LIBRARY path does not match the * last dirname in the installLib variable, use the last dir name * of installLib in addition to the orginal TCL_LIBRARY path. */ str = getenv("TCL_LIBRARY"); /* INTL: Native. */ Tcl_ExternalToUtfDString(NULL, str, -1, &buffer); str = Tcl_DStringValue(&buffer); if ((str != NULL) && (str[0] != '\0')) { /* * If TCL_LIBRARY is set, search there. */ objPtr = Tcl_NewStringObj(str, -1); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_SplitPath(str, &pathc, &pathv); if ((pathc > 0) && (strcasecmp(installLib + 4, pathv[pathc-1]) != 0)) { /* * If TCL_LIBRARY is set but refers to a different tcl * installation than the current version, try fiddling with the * specified directory to make it refer to this installation by * removing the old "tclX.Y" and substituting the current * version string. */ pathv[pathc - 1] = installLib + 4; str = Tcl_JoinPath(pathc, pathv, &ds); objPtr = Tcl_NewStringObj(str, Tcl_DStringLength(&ds)); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_DStringFree(&ds); } ckfree((char *) pathv); } /* * Look for the library relative to the executable. This algorithm * should be the same as the one in the tcl_findLibrary procedure. * * This code looks in the following directories: * * /../ * (e.g. /usr/local/bin/../lib/tcl8.4) * /../../ * (e.g. /usr/local/TclPro/solaris-sparc/bin/../../lib/tcl8.4) * /../library * (e.g. /usr/src/tcl8.4.0/unix/../library) * /../../library * (e.g. /usr/src/tcl8.4.0/unix/solaris-sparc/../../library) * /../../ * (e.g. /usr/src/tcl8.4.0/unix/../../tcl8.4.0/library) * /../../../ * (e.g. /usr/src/tcl8.4.0/unix/solaris-sparc/../../../tcl8.4.0/library) */ /* * The variable path holds an absolute path. Take care not to * overwrite pathv[0] since that might produce a relative path. */ if (path != NULL) { int i, origc; CONST char **origv; Tcl_SplitPath(path, &origc, &origv); pathc = 0; pathv = (CONST char **) ckalloc((unsigned int)(origc * sizeof(char *))); for (i=0; i< origc; i++) { if (origv[i][0] == '.') { if (strcmp(origv[i], ".") == 0) { /* do nothing */ } else if (strcmp(origv[i], "..") == 0) { pathc--; } else { pathv[pathc++] = origv[i]; } } else { pathv[pathc++] = origv[i]; } } if (pathc > 2) { str = pathv[pathc - 2]; pathv[pathc - 2] = installLib; path = Tcl_JoinPath(pathc - 1, pathv, &ds); pathv[pathc - 2] = str; objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds)); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_DStringFree(&ds); } if (pathc > 3) { str = pathv[pathc - 3]; pathv[pathc - 3] = installLib; path = Tcl_JoinPath(pathc - 2, pathv, &ds); pathv[pathc - 3] = str; objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds)); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_DStringFree(&ds); } if (pathc > 2) { str = pathv[pathc - 2]; pathv[pathc - 2] = "library"; path = Tcl_JoinPath(pathc - 1, pathv, &ds); pathv[pathc - 2] = str; objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds)); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_DStringFree(&ds); } if (pathc > 3) { str = pathv[pathc - 3]; pathv[pathc - 3] = "library"; path = Tcl_JoinPath(pathc - 2, pathv, &ds); pathv[pathc - 3] = str; objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds)); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_DStringFree(&ds); } if (pathc > 3) { str = pathv[pathc - 3]; pathv[pathc - 3] = developLib; path = Tcl_JoinPath(pathc - 2, pathv, &ds); pathv[pathc - 3] = str; objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds)); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_DStringFree(&ds); } if (pathc > 4) { str = pathv[pathc - 4]; pathv[pathc - 4] = developLib; path = Tcl_JoinPath(pathc - 3, pathv, &ds); pathv[pathc - 4] = str; objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds)); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); Tcl_DStringFree(&ds); } ckfree((char *) origv); ckfree((char *) pathv); } /* * Finally, look for the library relative to the compiled-in path. * This is needed when users install Tcl with an exec-prefix that * is different from the prtefix. */ { #ifdef HAVE_COREFOUNDATION char tclLibPath[MAXPATHLEN + 1]; if (MacOSXGetLibraryPath(NULL, MAXPATHLEN, tclLibPath) == TCL_OK) { str = tclLibPath; } else #endif /* HAVE_COREFOUNDATION */ { str = defaultLibraryDir; } if (str[0] != '\0') { objPtr = Tcl_NewStringObj(str, -1); Tcl_ListObjAppendElement(NULL, pathPtr, objPtr); } } TclSetLibraryPath(pathPtr); Tcl_DStringFree(&buffer); return 1; /* 1 indicates that pathPtr may be dirty utf (needs cleaning) */ } /* *--------------------------------------------------------------------------- * * TclpSetInitialEncodings -- * * Based on the locale, determine the encoding of the operating * system and the default encoding for newly opened files. * * Called at process initialization time, and part way through * startup, we verify that the initial encodings were correctly * setup. Depending on Tcl's environment, there may not have been * enough information first time through (above). * * Results: * None. * * Side effects: * The Tcl library path is converted from native encoding to UTF-8, * on the first call, and the encodings may be changed on first or * second call. * *--------------------------------------------------------------------------- */ void TclpSetInitialEncodings() { CONST char *encoding = NULL; int i, setSysEncCode = TCL_ERROR; Tcl_Obj *pathPtr; /* * Determine the current encoding from the LC_* or LANG environment * variables. We previously used setlocale() to determine the locale, * but this does not work on some systems (e.g. Linux/i386 RH 5.0). */ #ifdef HAVE_LANGINFO if ( #ifdef WEAK_IMPORT_NL_LANGINFO nl_langinfo != NULL && #endif setlocale(LC_CTYPE, "") != NULL) { Tcl_DString ds; /* * Use a DString so we can overwrite it in name compatability * checks below. */ Tcl_DStringInit(&ds); encoding = Tcl_DStringAppend(&ds, nl_langinfo(CODESET), -1); Tcl_UtfToLower(Tcl_DStringValue(&ds)); #ifdef HAVE_LANGINFO_DEBUG fprintf(stderr, "encoding '%s'", encoding); #endif if (encoding[0] == 'i' && encoding[1] == 's' && encoding[2] == 'o' && encoding[3] == '-') { char *p, *q; /* need to strip '-' from iso-* encoding */ for(p = Tcl_DStringValue(&ds)+3, q = Tcl_DStringValue(&ds)+4; *p; *p++ = *q++); } else if (encoding[0] == 'i' && encoding[1] == 'b' && encoding[2] == 'm' && encoding[3] >= '0' && encoding[3] <= '9') { char *p, *q; /* if langinfo reports "ibm*" we should use "cp*" */ p = Tcl_DStringValue(&ds); *p++ = 'c'; *p++ = 'p'; for(q = p+1; *p ; *p++ = *q++); } else if ((*encoding == '\0') || !strcmp(encoding, "ansi_x3.4-1968")) { /* Use iso8859-1 for empty or 'ansi_x3.4-1968' encoding */ encoding = "iso8859-1"; } #ifdef HAVE_LANGINFO_DEBUG fprintf(stderr, " ?%s?", encoding); #endif setSysEncCode = Tcl_SetSystemEncoding(NULL, encoding); if (setSysEncCode != TCL_OK) { /* * If this doesn't return TCL_OK, the encoding returned by * nl_langinfo or as we translated it wasn't accepted. Do * this fallback check. If this fails, we will enter the * old fallback below. */ for (i = 0; localeTable[i].lang != NULL; i++) { if (strcmp(localeTable[i].lang, encoding) == 0) { setSysEncCode = Tcl_SetSystemEncoding(NULL, localeTable[i].encoding); break; } } } #ifdef HAVE_LANGINFO_DEBUG fprintf(stderr, " => '%s'\n", encoding); #endif Tcl_DStringFree(&ds); } #ifdef HAVE_LANGINFO_DEBUG else { fprintf(stderr, "setlocale returned NULL\n"); } #endif #endif /* HAVE_LANGINFO */ if (setSysEncCode != TCL_OK) { /* * Classic fallback check. This tries a homebrew algorithm to * determine what encoding should be used based on env vars. */ char *langEnv = getenv("LC_ALL"); encoding = NULL; if (langEnv == NULL || langEnv[0] == '\0') { langEnv = getenv("LC_CTYPE"); } if (langEnv == NULL || langEnv[0] == '\0') { langEnv = getenv("LANG"); } if (langEnv == NULL || langEnv[0] == '\0') { langEnv = NULL; } if (langEnv != NULL) { for (i = 0; localeTable[i].lang != NULL; i++) { if (strcmp(localeTable[i].lang, langEnv) == 0) { encoding = localeTable[i].encoding; break; } } /* * There was no mapping in the locale table. If there is an * encoding subfield, we can try to guess from that. */ if (encoding == NULL) { char *p; for (p = langEnv; *p != '\0'; p++) { if (*p == '.') { p++; break; } } if (*p != '\0') { Tcl_DString ds; Tcl_DStringInit(&ds); encoding = Tcl_DStringAppend(&ds, p, -1); Tcl_UtfToLower(Tcl_DStringValue(&ds)); setSysEncCode = Tcl_SetSystemEncoding(NULL, encoding); if (setSysEncCode != TCL_OK) { encoding = NULL; } Tcl_DStringFree(&ds); } } #ifdef HAVE_LANGINFO_DEBUG fprintf(stderr, "encoding fallback check '%s' => '%s'\n", langEnv, encoding); #endif } if (setSysEncCode != TCL_OK) { if (encoding == NULL) { encoding = TCL_DEFAULT_ENCODING; } Tcl_SetSystemEncoding(NULL, encoding); } /* * Initialize the C library's locale subsystem. This is required * for input methods to work properly on X11. We only do this for * LC_CTYPE because that's the necessary one, and we don't want to * affect LC_TIME here. The side effect of setting the default * locale should be to load any locale specific modules that are * needed by X. [BUG: 5422 3345 4236 2522 2521]. * In HAVE_LANGINFO, this call is already done above. */ #ifndef HAVE_LANGINFO setlocale(LC_CTYPE, ""); #endif } /* * In case the initial locale is not "C", ensure that the numeric * processing is done in "C" locale regardless. This is needed because * Tcl relies on routines like strtod, but should not have locale * dependent behavior. */ setlocale(LC_NUMERIC, "C"); if ((libraryPathEncodingFixed == 0) && strcmp("identity", Tcl_GetEncodingName(Tcl_GetEncoding(NULL, NULL))) ) { /* * Until the system encoding was actually set, the library path was * actually in the native multi-byte encoding, and not really UTF-8 * as advertised. We cheated as follows: * * 1. It was safe to allow the Tcl_SetSystemEncoding() call to * append the ASCII chars that make up the encoding's filename to * the names (in the native encoding) of directories in the library * path, since all Unix multi-byte encodings have ASCII in the * beginning. * * 2. To open the encoding file, the native bytes in the file name * were passed to the OS, without translating from UTF-8 to native, * because the name was already in the native encoding. * * Now that the system encoding was actually successfully set, * translate all the names in the library path to UTF-8. That way, * next time we search the library path, we'll translate the names * from UTF-8 to the system encoding which will be the native * encoding. */ pathPtr = TclGetLibraryPath(); if (pathPtr != NULL) { int objc; Tcl_Obj **objv; objc = 0; Tcl_ListObjGetElements(NULL, pathPtr, &objc, &objv); for (i = 0; i < objc; i++) { int length; char *string; Tcl_DString ds; string = Tcl_GetStringFromObj(objv[i], &length); Tcl_ExternalToUtfDString(NULL, string, length, &ds); Tcl_SetStringObj(objv[i], Tcl_DStringValue(&ds), Tcl_DStringLength(&ds)); Tcl_DStringFree(&ds); } } libraryPathEncodingFixed = 1; } /* This is only ever called from the startup thread */ if (binaryEncoding == NULL) { /* * Keep the iso8859-1 encoding preloaded. The IO package uses * it for gets on a binary channel. */ binaryEncoding = Tcl_GetEncoding(NULL, "iso8859-1"); } } /* *--------------------------------------------------------------------------- * * TclpSetVariables -- * * Performs platform-specific interpreter initialization related to * the tcl_library and tcl_platform variables, and other platform- * specific things. * * Results: * None. * * Side effects: * Sets "tclDefaultLibrary", "tcl_pkgPath", and "tcl_platform" Tcl * variables. * *---------------------------------------------------------------------- */ void TclpSetVariables(interp) Tcl_Interp *interp; { #ifndef NO_UNAME struct utsname name; #endif int unameOK; CONST char *user; Tcl_DString ds; #ifdef HAVE_COREFOUNDATION char tclLibPath[MAXPATHLEN + 1]; #if MAC_OS_X_VERSION_MAX_ALLOWED > 1020 /* * Set msgcat fallback locale to current CFLocale identifier. */ CFLocaleRef localeRef; if (CFLocaleCopyCurrent != NULL && CFLocaleGetIdentifier != NULL && (localeRef = CFLocaleCopyCurrent())) { CFStringRef locale = CFLocaleGetIdentifier(localeRef); if (locale) { char loc[256]; if (CFStringGetCString(locale, loc, 256, kCFStringEncodingUTF8)) { if (!Tcl_CreateNamespace(interp, "::tcl::mac", NULL, NULL)) { Tcl_ResetResult(interp); } Tcl_SetVar(interp, "::tcl::mac::locale", loc, TCL_GLOBAL_ONLY); } } CFRelease(localeRef); } #endif if (MacOSXGetLibraryPath(interp, MAXPATHLEN, tclLibPath) == TCL_OK) { CONST char *str; Tcl_DString ds; CFBundleRef bundleRef; Tcl_SetVar(interp, "tclDefaultLibrary", tclLibPath, TCL_GLOBAL_ONLY); Tcl_SetVar(interp, "tcl_pkgPath", tclLibPath, TCL_GLOBAL_ONLY); Tcl_SetVar(interp, "tcl_pkgPath", " ", TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); str = TclGetEnv("DYLD_FRAMEWORK_PATH", &ds); if ((str != NULL) && (str[0] != '\0')) { char *p = Tcl_DStringValue(&ds); /* convert DYLD_FRAMEWORK_PATH from colon to space separated */ do { if(*p == ':') *p = ' '; } while (*p++); Tcl_SetVar(interp, "tcl_pkgPath", Tcl_DStringValue(&ds), TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); Tcl_SetVar(interp, "tcl_pkgPath", " ", TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); Tcl_DStringFree(&ds); } if ((bundleRef = CFBundleGetMainBundle())) { CFURLRef frameworksURL; Tcl_StatBuf statBuf; if((frameworksURL = CFBundleCopyPrivateFrameworksURL(bundleRef))) { if(CFURLGetFileSystemRepresentation(frameworksURL, TRUE, (unsigned char*) tclLibPath, MAXPATHLEN) && ! TclOSstat(tclLibPath, &statBuf) && S_ISDIR(statBuf.st_mode)) { Tcl_SetVar(interp, "tcl_pkgPath", tclLibPath, TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); Tcl_SetVar(interp, "tcl_pkgPath", " ", TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); } CFRelease(frameworksURL); } if((frameworksURL = CFBundleCopySharedFrameworksURL(bundleRef))) { if(CFURLGetFileSystemRepresentation(frameworksURL, TRUE, (unsigned char*) tclLibPath, MAXPATHLEN) && ! TclOSstat(tclLibPath, &statBuf) && S_ISDIR(statBuf.st_mode)) { Tcl_SetVar(interp, "tcl_pkgPath", tclLibPath, TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); Tcl_SetVar(interp, "tcl_pkgPath", " ", TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); } CFRelease(frameworksURL); } } Tcl_SetVar(interp, "tcl_pkgPath", pkgPath, TCL_GLOBAL_ONLY | TCL_APPEND_VALUE); } else #endif /* HAVE_COREFOUNDATION */ { Tcl_SetVar(interp, "tclDefaultLibrary", defaultLibraryDir, TCL_GLOBAL_ONLY); Tcl_SetVar(interp, "tcl_pkgPath", pkgPath, TCL_GLOBAL_ONLY); } #ifdef DJGPP Tcl_SetVar2(interp, "tcl_platform", "platform", "dos", TCL_GLOBAL_ONLY); #else Tcl_SetVar2(interp, "tcl_platform", "platform", "unix", TCL_GLOBAL_ONLY); #endif unameOK = 0; #ifndef NO_UNAME if (uname(&name) >= 0) { CONST char *native; unameOK = 1; native = Tcl_ExternalToUtfDString(NULL, name.sysname, -1, &ds); Tcl_SetVar2(interp, "tcl_platform", "os", native, TCL_GLOBAL_ONLY); Tcl_DStringFree(&ds); /* * The following code is a special hack to handle differences in * the way version information is returned by uname. On most * systems the full version number is available in name.release. * However, under AIX the major version number is in * name.version and the minor version number is in name.release. */ if ((strchr(name.release, '.') != NULL) || !isdigit(UCHAR(name.version[0]))) { /* INTL: digit */ Tcl_SetVar2(interp, "tcl_platform", "osVersion", name.release, TCL_GLOBAL_ONLY); } else { Tcl_SetVar2(interp, "tcl_platform", "osVersion", name.version, TCL_GLOBAL_ONLY); Tcl_SetVar2(interp, "tcl_platform", "osVersion", ".", TCL_GLOBAL_ONLY|TCL_APPEND_VALUE); Tcl_SetVar2(interp, "tcl_platform", "osVersion", name.release, TCL_GLOBAL_ONLY|TCL_APPEND_VALUE); } Tcl_SetVar2(interp, "tcl_platform", "machine", name.machine, TCL_GLOBAL_ONLY); } #endif if (!unameOK) { Tcl_SetVar2(interp, "tcl_platform", "os", "", TCL_GLOBAL_ONLY); Tcl_SetVar2(interp, "tcl_platform", "osVersion", "", TCL_GLOBAL_ONLY); Tcl_SetVar2(interp, "tcl_platform", "machine", "", TCL_GLOBAL_ONLY); } /* * Copy USER or LOGNAME environment variable into tcl_platform(user) */ Tcl_DStringInit(&ds); user = TclGetEnv("USER", &ds); if (user == NULL) { user = TclGetEnv("LOGNAME", &ds); if (user == NULL) { user = ""; } } Tcl_SetVar2(interp, "tcl_platform", "user", user, TCL_GLOBAL_ONLY); Tcl_DStringFree(&ds); } /* *---------------------------------------------------------------------- * * TclpFindVariable -- * * Locate the entry in environ for a given name. On Unix this * routine is case sensetive, on Windows this matches mixed case. * * Results: * The return value is the index in environ of an entry with the * name "name", or -1 if there is no such entry. The integer at * *lengthPtr is filled in with the length of name (if a matching * entry is found) or the length of the environ array (if no matching * entry is found). * * Side effects: * None. * *---------------------------------------------------------------------- */ int TclpFindVariable(name, lengthPtr) CONST char *name; /* Name of desired environment variable * (native). */ int *lengthPtr; /* Used to return length of name (for * successful searches) or number of non-NULL * entries in environ (for unsuccessful * searches). */ { int i, result = -1; register CONST char *env, *p1, *p2; Tcl_DString envString; Tcl_DStringInit(&envString); for (i = 0, env = environ[i]; env != NULL; i++, env = environ[i]) { p1 = Tcl_ExternalToUtfDString(NULL, env, -1, &envString); p2 = name; for (; *p2 == *p1; p1++, p2++) { /* NULL loop body. */ } if ((*p1 == '=') && (*p2 == '\0')) { *lengthPtr = p2 - name; result = i; goto done; } Tcl_DStringFree(&envString); } *lengthPtr = i; done: Tcl_DStringFree(&envString); return result; } /* *---------------------------------------------------------------------- * * Tcl_Init -- * * This procedure is typically invoked by Tcl_AppInit procedures * to find and source the "init.tcl" script, which should exist * somewhere on the Tcl library path. * * Results: * Returns a standard Tcl completion code and sets the interp's * result if there is an error. * * Side effects: * Depends on what's in the init.tcl script. * *---------------------------------------------------------------------- */ int Tcl_Init(interp) Tcl_Interp *interp; /* Interpreter to initialize. */ { Tcl_Obj *pathPtr; if (tclPreInitScript != NULL) { if (Tcl_Eval(interp, tclPreInitScript) == TCL_ERROR) { return (TCL_ERROR); }; } pathPtr = TclGetLibraryPath(); if (pathPtr == NULL) { pathPtr = Tcl_NewObj(); } Tcl_IncrRefCount(pathPtr); Tcl_SetVar2Ex(interp, "tcl_libPath", NULL, pathPtr, TCL_GLOBAL_ONLY); Tcl_DecrRefCount(pathPtr); return Tcl_Eval(interp, initScript); } /* *---------------------------------------------------------------------- * * Tcl_SourceRCFile -- * * This procedure is typically invoked by Tcl_Main of Tk_Main * procedure to source an application specific rc file into the * interpreter at startup time. * * Results: * None. * * Side effects: * Depends on what's in the rc script. * *---------------------------------------------------------------------- */ void Tcl_SourceRCFile(interp) Tcl_Interp *interp; /* Interpreter to source rc file into. */ { Tcl_DString temp; CONST char *fileName; Tcl_Channel errChannel; fileName = Tcl_GetVar(interp, "tcl_rcFileName", TCL_GLOBAL_ONLY); if (fileName != NULL) { Tcl_Channel c; CONST char *fullName; Tcl_DStringInit(&temp); fullName = Tcl_TranslateFileName(interp, fileName, &temp); if (fullName == NULL) { /* * Couldn't translate the file name (e.g. it referred to a * bogus user or there was no HOME environment variable). * Just do nothing. */ } else { /* * Test for the existence of the rc file before trying to read it. */ c = Tcl_OpenFileChannel(NULL, fullName, "r", 0); if (c != (Tcl_Channel) NULL) { Tcl_Close(NULL, c); if (Tcl_EvalFile(interp, fullName) != TCL_OK) { errChannel = Tcl_GetStdChannel(TCL_STDERR); if (errChannel) { Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp)); Tcl_WriteChars(errChannel, "\n", 1); } } } } Tcl_DStringFree(&temp); } } /* *---------------------------------------------------------------------- * * TclpCheckStackSpace -- * * Detect if we are about to blow the stack. Called before an * evaluation can happen when nesting depth is checked. * * Results: * 1 if there is enough stack space to continue; 0 if not. * * Side effects: * None. * *---------------------------------------------------------------------- */ int TclpCheckStackSpace() { /* * This function is unimplemented on Unix platforms. */ return 1; } /* *---------------------------------------------------------------------- * * MacOSXGetLibraryPath -- * * If we have a bundle structure for the Tcl installation, * then check there first to see if we can find the libraries * there. * * Results: * TCL_OK if we have found the tcl library; TCL_ERROR otherwise. * * Side effects: * Same as for Tcl_MacOSXOpenVersionedBundleResources. * *---------------------------------------------------------------------- */ #ifdef HAVE_COREFOUNDATION static int MacOSXGetLibraryPath(Tcl_Interp *interp, int maxPathLen, char *tclLibPath) { int foundInFramework = TCL_ERROR; #ifdef TCL_FRAMEWORK foundInFramework = Tcl_MacOSXOpenVersionedBundleResources(interp, "com.tcltk.tcllibrary", TCL_FRAMEWORK_VERSION, 0, maxPathLen, tclLibPath); #endif return foundInFramework; } #endif /* HAVE_COREFOUNDATION */ on> Tcl is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful.
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path: root/unix/tclUnixPipe.c
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/* 
 * tclUnixPipe.c --
 *
 *	This file implements the UNIX-specific exec pipeline functions,
 *	the "pipe" channel driver, and the "pid" Tcl command.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclUnixPipe.c,v 1.23.2.7 2006/08/02 20:04:40 das Exp $
 */

#include "tclInt.h"
#include "tclPort.h"

#ifdef USE_VFORK
#define fork vfork
#endif

/*
 * The following macros convert between TclFile's and fd's.  The conversion
 * simple involves shifting fd's up by one to ensure that no valid fd is ever
 * the same as NULL.
 */

#define MakeFile(fd) ((TclFile)(((int)fd)+1))
#define GetFd(file) (((int)file)-1)

/*
 * This structure describes per-instance state of a pipe based channel.
 */

typedef struct PipeState {
    Tcl_Channel channel;/* Channel associated with this file. */
    TclFile inFile;	/* Output from pipe. */
    TclFile outFile;	/* Input to pipe. */
    TclFile errorFile;	/* Error output from pipe. */
    int numPids;	/* How many processes are attached to this pipe? */
    Tcl_Pid *pidPtr;	/* The process IDs themselves. Allocated by
                         * the creator of the pipe. */
    int isNonBlocking;	/* Nonzero when the pipe is in nonblocking mode.
                         * Used to decide whether to wait for the children
                         * at close time. */
} PipeState;

/*
 * Declarations for local procedures defined in this file:
 */

static int	PipeBlockModeProc _ANSI_ARGS_((ClientData instanceData,
		    int mode));
static int	PipeCloseProc _ANSI_ARGS_((ClientData instanceData,
		    Tcl_Interp *interp));
static int	PipeGetHandleProc _ANSI_ARGS_((ClientData instanceData,
		    int direction, ClientData *handlePtr));
static int	PipeInputProc _ANSI_ARGS_((ClientData instanceData,
		    char *buf, int toRead, int *errorCode));
static int	PipeOutputProc _ANSI_ARGS_((
		    ClientData instanceData, CONST char *buf, int toWrite,
		    int *errorCode));
static void	PipeWatchProc _ANSI_ARGS_((ClientData instanceData, int mask));
static void	RestoreSignals _ANSI_ARGS_((void));
static int	SetupStdFile _ANSI_ARGS_((TclFile file, int type));

/*
 * This structure describes the channel type structure for command pipe
 * based IO:
 */

static Tcl_ChannelType pipeChannelType = {
    "pipe",			/* Type name. */
    TCL_CHANNEL_VERSION_4,	/* v4 channel */
    PipeCloseProc,		/* Close proc. */
    PipeInputProc,		/* Input proc. */
    PipeOutputProc,		/* Output proc. */
    NULL,			/* Seek proc. */
    NULL,			/* Set option proc. */
    NULL,			/* Get option proc. */
    PipeWatchProc,		/* Initialize notifier. */
    PipeGetHandleProc,		/* Get OS handles out of channel. */
    NULL,			/* close2proc. */
    PipeBlockModeProc,		/* Set blocking or non-blocking mode.*/
    NULL,			/* flush proc. */
    NULL,			/* handler proc. */
    NULL,                       /* wide seek proc */
    NULL,                       /* thread action proc */
};

/*
 *----------------------------------------------------------------------
 *
 * TclpMakeFile --
 *
 *	Make a TclFile from a channel.
 *
 * Results:
 *	Returns a new TclFile or NULL on failure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

TclFile
TclpMakeFile(channel, direction)
    Tcl_Channel channel;	/* Channel to get file from. */
    int direction;		/* Either TCL_READABLE or TCL_WRITABLE. */
{
    ClientData data;

    if (Tcl_GetChannelHandle(channel, direction, (ClientData *) &data)
	    == TCL_OK) {
	return MakeFile((int)data);
    } else {
	return (TclFile) NULL;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TclpOpenFile --
 *
 *	Open a file for use in a pipeline.  
 *
 * Results:
 *	Returns a new TclFile handle or NULL on failure.
 *
 * Side effects:
 *	May cause a file to be created on the file system.
 *
 *----------------------------------------------------------------------
 */

TclFile
TclpOpenFile(fname, mode)
    CONST char *fname;		/* The name of the file to open. */
    int mode;			/* In what mode to open the file? */
{
    int fd;
    CONST char *native;
    Tcl_DString ds;

    native = Tcl_UtfToExternalDString(NULL, fname, -1, &ds);
    fd = TclOSopen(native, mode, 0666);			/* INTL: Native. */
    Tcl_DStringFree(&ds);
    if (fd != -1) {
        fcntl(fd, F_SETFD, FD_CLOEXEC);

	/*
	 * If the file is being opened for writing, seek to the end
	 * so we can append to any data already in the file.
	 */

	if ((mode & O_WRONLY) && !(mode & O_APPEND)) {
	    TclOSseek(fd, (Tcl_SeekOffset) 0, SEEK_END);
	}

	/*
	 * Increment the fd so it can't be 0, which would conflict with
	 * the NULL return for errors.
	 */

	return MakeFile(fd);
    }
    return NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpCreateTempFile --
 *
 *	This function creates a temporary file initialized with an
 *	optional string, and returns a file handle with the file pointer
 *	at the beginning of the file.
 *
 * Results:
 *	A handle to a file.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

TclFile
TclpCreateTempFile(contents)
    CONST char *contents;	/* String to write into temp file, or NULL. */
{
    char fileName[L_tmpnam + 9];
    CONST char *native;
    Tcl_DString dstring;
    int fd;

    /*
     * We should also check against making more then TMP_MAX of these.
     */

    strcpy(fileName, P_tmpdir);				/* INTL: Native. */
    if (fileName[strlen(fileName) - 1] != '/') {
	strcat(fileName, "/");				/* INTL: Native. */
    }
    strcat(fileName, "tclXXXXXX");
    fd = mkstemp(fileName);				/* INTL: Native. */
    if (fd == -1) {
	return NULL;
    }
    fcntl(fd, F_SETFD, FD_CLOEXEC);
    unlink(fileName);					/* INTL: Native. */

    if (contents != NULL) {
	native = Tcl_UtfToExternalDString(NULL, contents, -1, &dstring);
	if (write(fd, native, strlen(native)) == -1) {
	    close(fd);
	    Tcl_DStringFree(&dstring);
	    return NULL;
	}
	Tcl_DStringFree(&dstring);
	TclOSseek(fd, (Tcl_SeekOffset) 0, SEEK_SET);
    }
    return MakeFile(fd);
}

/*
 *----------------------------------------------------------------------
 *
 * TclpTempFileName --
 *
 *	This function returns unique filename.
 *
 * Results:
 *	Returns a valid Tcl_Obj* with refCount 0, or NULL on failure.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Obj* 
TclpTempFileName()
{
    char fileName[L_tmpnam + 9];
    Tcl_Obj *result = NULL;
    int fd;

    /*
     * We should also check against making more then TMP_MAX of these.
     */

    strcpy(fileName, P_tmpdir);		/* INTL: Native. */
    if (fileName[strlen(fileName) - 1] != '/') {
	strcat(fileName, "/");		/* INTL: Native. */
    }
    strcat(fileName, "tclXXXXXX");
    fd = mkstemp(fileName);		/* INTL: Native. */
    if (fd == -1) {
	return NULL;
    }
    fcntl(fd, F_SETFD, FD_CLOEXEC);
    unlink(fileName);			/* INTL: Native. */

    result = TclpNativeToNormalized((ClientData) fileName);
    close (fd);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpCreatePipe --
 *
 *      Creates a pipe - simply calls the pipe() function.
 *
 * Results:
 *      Returns 1 on success, 0 on failure. 
 *
 * Side effects:
 *      Creates a pipe.
 *
 *----------------------------------------------------------------------
 */

int
TclpCreatePipe(readPipe, writePipe)
    TclFile *readPipe;		/* Location to store file handle for
				 * read side of pipe. */
    TclFile *writePipe;		/* Location to store file handle for
				 * write side of pipe. */
{
    int pipeIds[2];

    if (pipe(pipeIds) != 0) {
	return 0;
    }

    fcntl(pipeIds[0], F_SETFD, FD_CLOEXEC);
    fcntl(pipeIds[1], F_SETFD, FD_CLOEXEC);

    *readPipe = MakeFile(pipeIds[0]);
    *writePipe = MakeFile(pipeIds[1]);
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpCloseFile --
 *
 *	Implements a mechanism to close a UNIX file.
 *
 * Results:
 *	Returns 0 on success, or -1 on error, setting errno.
 *
 * Side effects:
 *	The file is closed.
 *
 *----------------------------------------------------------------------
 */

int
TclpCloseFile(file)
    TclFile file;	/* The file to close. */
{
    int fd = GetFd(file);

    /*
     * Refuse to close the fds for stdin, stdout and stderr.
     */
    
    if ((fd == 0) || (fd == 1) || (fd == 2)) {
        return 0;
    }
    
    Tcl_DeleteFileHandler(fd);
    return close(fd);
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpCreateProcess --
 *
 *	Create a child process that has the specified files as its 
 *	standard input, output, and error.  The child process runs
 *	asynchronously and runs with the same environment variables
 *	as the creating process.
 *
 *	The path is searched to find the specified executable.  
 *
 * Results:
 *	The return value is TCL_ERROR and an error message is left in
 *	the interp's result if there was a problem creating the child 
 *	process.  Otherwise, the return value is TCL_OK and *pidPtr is
 *	filled with the process id of the child process.
 * 
 * Side effects:
 *	A process is created.
 *	
 *---------------------------------------------------------------------------
 */

    /* ARGSUSED */
int
TclpCreateProcess(interp, argc, argv, inputFile, outputFile, errorFile, 
	pidPtr)
    Tcl_Interp *interp;		/* Interpreter in which to leave errors that
				 * occurred when creating the child process.
				 * Error messages from the child process
				 * itself are sent to errorFile. */
    int argc;			/* Number of arguments in following array. */
    CONST char **argv;		/* Array of argument strings in UTF-8.
				 * argv[0] contains the name of the executable
				 * translated using Tcl_TranslateFileName
				 * call).  Additional arguments have not been
				 * converted. */
    TclFile inputFile;		/* If non-NULL, gives the file to use as
				 * input for the child process.  If inputFile
				 * file is not readable or is NULL, the child
				 * will receive no standard input. */
    TclFile outputFile;		/* If non-NULL, gives the file that
				 * receives output from the child process.  If
				 * outputFile file is not writeable or is
				 * NULL, output from the child will be
				 * discarded. */
    TclFile errorFile;		/* If non-NULL, gives the file that
				 * receives errors from the child process.  If
				 * errorFile file is not writeable or is NULL,
				 * errors from the child will be discarded.
				 * errorFile may be the same as outputFile. */
    Tcl_Pid *pidPtr;		/* If this procedure is successful, pidPtr
				 * is filled with the process id of the child
				 * process. */
{
    TclFile errPipeIn, errPipeOut;
    int count, status, fd;
    char errSpace[200 + TCL_INTEGER_SPACE];
    Tcl_DString *dsArray;
    char **newArgv;
    int pid, i;
    
    errPipeIn = NULL;
    errPipeOut = NULL;
    pid = -1;

    /*
     * Create a pipe that the child can use to return error
     * information if anything goes wrong.
     */

    if (TclpCreatePipe(&errPipeIn, &errPipeOut) == 0) {
	Tcl_AppendResult(interp, "couldn't create pipe: ",
		Tcl_PosixError(interp), (char *) NULL);
	goto error;
    }

    /*
     * We need to allocate and convert this before the fork
     * so it is properly deallocated later
     */
    dsArray = (Tcl_DString *) ckalloc(argc * sizeof(Tcl_DString));
    newArgv = (char **) ckalloc((argc+1) * sizeof(char *));
    newArgv[argc] = NULL;
    for (i = 0; i < argc; i++) {
	newArgv[i] = Tcl_UtfToExternalDString(NULL, argv[i], -1, &dsArray[i]);
    }

#ifdef USE_VFORK
    /*
     * After vfork(), do not call code in the child that changes global state,
     * because it is using the parent's memory space at that point and writes
     * might corrupt the parent: so ensure standard channels are initialized in
     * the parent, otherwise SetupStdFile() might initialize them in the child.
     */
    if (!inputFile) {
	Tcl_GetStdChannel(TCL_STDIN);
    }
    if (!outputFile) {
        Tcl_GetStdChannel(TCL_STDOUT);
    }
    if (!errorFile) {
        Tcl_GetStdChannel(TCL_STDERR);
    }
#endif
    pid = fork();
    if (pid == 0) {
	int joinThisError = errorFile && (errorFile == outputFile);

	fd = GetFd(errPipeOut);

	/*
	 * Set up stdio file handles for the child process.
	 */

	if (!SetupStdFile(inputFile, TCL_STDIN)
		|| !SetupStdFile(outputFile, TCL_STDOUT)
		|| (!joinThisError && !SetupStdFile(errorFile, TCL_STDERR))
		|| (joinThisError &&
			((dup2(1,2) == -1) ||
			 (fcntl(2, F_SETFD, 0) != 0)))) {
	    sprintf(errSpace,
		    "%dforked process couldn't set up input/output: ", errno);
	    write(fd, errSpace, (size_t) strlen(errSpace));
	    _exit(1);
	}

	/*
	 * Close the input side of the error pipe.
	 */

	RestoreSignals();
	execvp(newArgv[0], newArgv);			/* INTL: Native. */
	sprintf(errSpace, "%dcouldn't execute \"%.150s\": ", errno, argv[0]);
	write(fd, errSpace, (size_t) strlen(errSpace));
	_exit(1);
    }
    
    /*
     * Free the mem we used for the fork
     */
    for (i = 0; i < argc; i++) {
	Tcl_DStringFree(&dsArray[i]);
    }
    ckfree((char *) dsArray);
    ckfree((char *) newArgv);

    if (pid == -1) {
	Tcl_AppendResult(interp, "couldn't fork child process: ",
		Tcl_PosixError(interp), (char *) NULL);
	goto error;
    }

    /*
     * Read back from the error pipe to see if the child started
     * up OK.  The info in the pipe (if any) consists of a decimal
     * errno value followed by an error message.
     */

    TclpCloseFile(errPipeOut);
    errPipeOut = NULL;

    fd = GetFd(errPipeIn);
    count = read(fd, errSpace, (size_t) (sizeof(errSpace) - 1));
    if (count > 0) {
	char *end;
	errSpace[count] = 0;
	errno = strtol(errSpace, &end, 10);
	Tcl_AppendResult(interp, end, Tcl_PosixError(interp),
		(char *) NULL);
	goto error;
    }
    
    TclpCloseFile(errPipeIn);
    *pidPtr = (Tcl_Pid) pid;
    return TCL_OK;

    error:
    if (pid != -1) {
	/*
	 * Reap the child process now if an error occurred during its
	 * startup.  We don't call this with WNOHANG because that can lead to
	 * defunct processes on an MP system.   We shouldn't have to worry
	 * about hanging here, since this is the error case.  [Bug: 6148]
	 */

	Tcl_WaitPid((Tcl_Pid) pid, &status, 0);
    }
    
    if (errPipeIn) {
	TclpCloseFile(errPipeIn);
    }
    if (errPipeOut) {
	TclpCloseFile(errPipeOut);
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * RestoreSignals --
 *
 *      This procedure is invoked in a forked child process just before
 *      exec-ing a new program to restore all signals to their default
 *      settings.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Signal settings get changed.
 *
 *----------------------------------------------------------------------
 */
 
static void
RestoreSignals()
{
#ifdef SIGABRT
    signal(SIGABRT, SIG_DFL);
#endif
#ifdef SIGALRM
    signal(SIGALRM, SIG_DFL);
#endif
#ifdef SIGFPE
    signal(SIGFPE, SIG_DFL);
#endif
#ifdef SIGHUP
    signal(SIGHUP, SIG_DFL);
#endif
#ifdef SIGILL
    signal(SIGILL, SIG_DFL);
#endif
#ifdef SIGINT
    signal(SIGINT, SIG_DFL);
#endif
#ifdef SIGPIPE
    signal(SIGPIPE, SIG_DFL);
#endif
#ifdef SIGQUIT
    signal(SIGQUIT, SIG_DFL);
#endif
#ifdef SIGSEGV
    signal(SIGSEGV, SIG_DFL);
#endif
#ifdef SIGTERM
    signal(SIGTERM, SIG_DFL);
#endif
#ifdef SIGUSR1
    signal(SIGUSR1, SIG_DFL);
#endif
#ifdef SIGUSR2
    signal(SIGUSR2, SIG_DFL);
#endif
#ifdef SIGCHLD
    signal(SIGCHLD, SIG_DFL);
#endif
#ifdef SIGCONT
    signal(SIGCONT, SIG_DFL);
#endif
#ifdef SIGTSTP
    signal(SIGTSTP, SIG_DFL);
#endif
#ifdef SIGTTIN
    signal(SIGTTIN, SIG_DFL);
#endif
#ifdef SIGTTOU
    signal(SIGTTOU, SIG_DFL);
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * SetupStdFile --
 *
 *	Set up stdio file handles for the child process, using the
 *	current standard channels if no other files are specified.
 *	If no standard channel is defined, or if no file is associated
 *	with the channel, then the corresponding standard fd is closed.
 *
 * Results:
 *	Returns 1 on success, or 0 on failure.
 *
 * Side effects:
 *	Replaces stdio fds.
 *
 *----------------------------------------------------------------------
 */

static int
SetupStdFile(file, type)
    TclFile file;		/* File to dup, or NULL. */
    int type;			/* One of TCL_STDIN, TCL_STDOUT, TCL_STDERR */
{
    Tcl_Channel channel;
    int fd;
    int targetFd = 0;		/* Initializations here needed only to */
    int direction = 0;		/* prevent warnings about using uninitialized
				 * variables. */

    switch (type) {
	case TCL_STDIN:
	    targetFd = 0;
	    direction = TCL_READABLE;
	    break;
	case TCL_STDOUT:
	    targetFd = 1;
	    direction = TCL_WRITABLE;
	    break;
	case TCL_STDERR:
	    targetFd = 2;
	    direction = TCL_WRITABLE;
	    break;
    }

    if (!file) {
	channel = Tcl_GetStdChannel(type);
	if (channel) {
	    file = TclpMakeFile(channel, direction);
	}
    }
    if (file) {
	fd = GetFd(file);
	if (fd != targetFd) {
	    if (dup2(fd, targetFd) == -1) {
		return 0;
	    }

            /*
             * Must clear the close-on-exec flag for the target FD, since
             * some systems (e.g. Ultrix) do not clear the CLOEXEC flag on
             * the target FD.
             */
            
            fcntl(targetFd, F_SETFD, 0);
	} else {
	    /*
	     * Since we aren't dup'ing the file, we need to explicitly clear
	     * the close-on-exec flag.
	     */

	   fcntl(fd, F_SETFD, 0);
	}
    } else {
	close(targetFd);
    }
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpCreateCommandChannel --
 *
 *	This function is called by the generic IO level to perform
 *	the platform specific channel initialization for a command
 *	channel.
 *
 * Results:
 *	Returns a new channel or NULL on failure.
 *
 * Side effects:
 *	Allocates a new channel.
 *
 *----------------------------------------------------------------------
 */

Tcl_Channel
TclpCreateCommandChannel(readFile, writeFile, errorFile, numPids, pidPtr)
    TclFile readFile;		/* If non-null, gives the file for reading. */
    TclFile writeFile;		/* If non-null, gives the file for writing. */
    TclFile errorFile;		/* If non-null, gives the file where errors
				 * can be read. */
    int numPids;		/* The number of pids in the pid array. */
    Tcl_Pid *pidPtr;		/* An array of process identifiers.
                                 * Allocated by the caller, freed when
                                 * the channel is closed or the processes
                                 * are detached (in a background exec). */
{
    char channelName[16 + TCL_INTEGER_SPACE];
    int channelId;
    PipeState *statePtr = (PipeState *) ckalloc((unsigned) sizeof(PipeState));
    int mode;

    statePtr->inFile = readFile;
    statePtr->outFile = writeFile;
    statePtr->errorFile = errorFile;
    statePtr->numPids = numPids;
    statePtr->pidPtr = pidPtr;
    statePtr->isNonBlocking = 0;

    mode = 0;
    if (readFile) {
        mode |= TCL_READABLE;
    }
    if (writeFile) {
        mode |= TCL_WRITABLE;
    }
    
    /*
     * Use one of the fds associated with the channel as the
     * channel id.
     */

    if (readFile) {
	channelId = GetFd(readFile);
    } else if (writeFile) {
	channelId = GetFd(writeFile);
    } else if (errorFile) {
	channelId = GetFd(errorFile);
    } else {
	channelId = 0;
    }

    /*
     * For backward compatibility with previous versions of Tcl, we
     * use "file%d" as the base name for pipes even though it would
     * be more natural to use "pipe%d".
     */

    sprintf(channelName, "file%d", channelId);
    statePtr->channel = Tcl_CreateChannel(&pipeChannelType, channelName,
            (ClientData) statePtr, mode);
    return statePtr->channel;
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetAndDetachPids --
 *
 *	This procedure is invoked in the generic implementation of a
 *	background "exec" (An exec when invoked with a terminating "&")
 *	to store a list of the PIDs for processes in a command pipeline
 *	in the interp's result and to detach the processes.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Modifies the interp's result. Detaches processes.
 *
 *----------------------------------------------------------------------
 */

void
TclGetAndDetachPids(interp, chan)
    Tcl_Interp *interp;
    Tcl_Channel chan;
{
    PipeState *pipePtr;
    Tcl_ChannelType *chanTypePtr;
    int i;
    char buf[TCL_INTEGER_SPACE];

    /*
     * Punt if the channel is not a command channel.
     */

    chanTypePtr = Tcl_GetChannelType(chan);
    if (chanTypePtr != &pipeChannelType) {
        return;
    }

    pipePtr = (PipeState *) Tcl_GetChannelInstanceData(chan);
    for (i = 0; i < pipePtr->numPids; i++) {
        TclFormatInt(buf, (long) TclpGetPid(pipePtr->pidPtr[i]));
        Tcl_AppendElement(interp, buf);
        Tcl_DetachPids(1, &(pipePtr->pidPtr[i]));
    }
    if (pipePtr->numPids > 0) {
        ckfree((char *) pipePtr->pidPtr);
        pipePtr->numPids = 0;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PipeBlockModeProc --
 *
 *	Helper procedure to set blocking and nonblocking modes on a
 *	pipe based channel. Invoked by generic IO level code.
 *
 * Results:
 *	0 if successful, errno when failed.
 *
 * Side effects:
 *	Sets the device into blocking or non-blocking mode.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
static int
PipeBlockModeProc(instanceData, mode)
    ClientData instanceData;		/* Pipe state. */
    int mode;				/* The mode to set. Can be one of
                                         * TCL_MODE_BLOCKING or
                                         * TCL_MODE_NONBLOCKING. */
{
    PipeState *psPtr = (PipeState *) instanceData;
    int curStatus;
    int fd;

#ifndef	USE_FIONBIO    
    if (psPtr->inFile) {
        fd = GetFd(psPtr->inFile);
        curStatus = fcntl(fd, F_GETFL);
        if (mode == TCL_MODE_BLOCKING) {
            curStatus &= (~(O_NONBLOCK));
        } else {
            curStatus |= O_NONBLOCK;
        }
        if (fcntl(fd, F_SETFL, curStatus) < 0) {
            return errno;
        }
    }
    if (psPtr->outFile) {
        fd = GetFd(psPtr->outFile);
        curStatus = fcntl(fd, F_GETFL);
        if (mode == TCL_MODE_BLOCKING) {
            curStatus &= (~(O_NONBLOCK));
        } else {
            curStatus |= O_NONBLOCK;
        }
        if (fcntl(fd, F_SETFL, curStatus) < 0) {
            return errno;
        }
    }
#endif	/* !FIONBIO */

#ifdef	USE_FIONBIO
    if (psPtr->inFile) {
        fd = GetFd(psPtr->inFile);
        if (mode == TCL_MODE_BLOCKING) {
            curStatus = 0;
        } else {
            curStatus = 1;
        }
        if (ioctl(fd, (int) FIONBIO, &curStatus) < 0) {
            return errno;
        }
    }
    if (psPtr->outFile != NULL) {
        fd = GetFd(psPtr->outFile);
        if (mode == TCL_MODE_BLOCKING) {
            curStatus = 0;
        } else {
            curStatus = 1;
        }
        if (ioctl(fd, (int) FIONBIO,  &curStatus) < 0) {
            return errno;
        }
    }
#endif	/* USE_FIONBIO */

    psPtr->isNonBlocking = (mode == TCL_MODE_NONBLOCKING);

    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * PipeCloseProc --
 *
 *	This procedure is invoked by the generic IO level to perform
 *	channel-type-specific cleanup when a command pipeline channel
 *	is closed.
 *
 * Results:
 *	0 on success, errno otherwise.
 *
 * Side effects:
 *	Closes the command pipeline channel.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
static int
PipeCloseProc(instanceData, interp)
    ClientData instanceData;	/* The pipe to close. */
    Tcl_Interp *interp;		/* For error reporting. */
{
    PipeState *pipePtr;
    Tcl_Channel errChan;
    int errorCode, result;

    errorCode = 0;
    result = 0;
    pipePtr = (PipeState *) instanceData;
    if (pipePtr->inFile) {
	if (TclpCloseFile(pipePtr->inFile) < 0) {
	    errorCode = errno;
	}
    }
    if (pipePtr->outFile) {
	if ((TclpCloseFile(pipePtr->outFile) < 0) && (errorCode == 0)) {
	    errorCode = errno;
	}
    }

    if (pipePtr->isNonBlocking || TclInExit()) {
    
	/*
         * If the channel is non-blocking or Tcl is being cleaned up, just
         * detach the children PIDs, reap them (important if we are in a
         * dynamic load module), and discard the errorFile.
         */
        
        Tcl_DetachPids(pipePtr->numPids, pipePtr->pidPtr);
        Tcl_ReapDetachedProcs();

        if (pipePtr->errorFile) {
	    TclpCloseFile(pipePtr->errorFile);
        }
    } else {
        
	/*
         * Wrap the error file into a channel and give it to the cleanup
         * routine.
         */

        if (pipePtr->errorFile) {
	    errChan = Tcl_MakeFileChannel(
		(ClientData) GetFd(pipePtr->errorFile), TCL_READABLE);
        } else {
            errChan = NULL;
        }
        result = TclCleanupChildren(interp, pipePtr->numPids, pipePtr->pidPtr,
                errChan);
    }

    if (pipePtr->numPids != 0) {
        ckfree((char *) pipePtr->pidPtr);
    }
    ckfree((char *) pipePtr);
    if (errorCode == 0) {
        return result;
    }
    return errorCode;
}

/*
 *----------------------------------------------------------------------
 *
 * PipeInputProc --
 *
 *	This procedure is invoked from the generic IO level to read
 *	input from a command pipeline based channel.
 *
 * Results:
 *	The number of bytes read is returned or -1 on error. An output
 *	argument contains a POSIX error code if an error occurs, or zero.
 *
 * Side effects:
 *	Reads input from the input device of the channel.
 *
 *----------------------------------------------------------------------
 */

static int
PipeInputProc(instanceData, buf, toRead, errorCodePtr)
    ClientData instanceData;		/* Pipe state. */
    char *buf;				/* Where to store data read. */
    int toRead;				/* How much space is available
                                         * in the buffer? */
    int *errorCodePtr;			/* Where to store error code. */
{
    PipeState *psPtr = (PipeState *) instanceData;
    int bytesRead;			/* How many bytes were actually
                                         * read from the input device? */

    *errorCodePtr = 0;
    
    /*
     * Assume there is always enough input available. This will block
     * appropriately, and read will unblock as soon as a short read is
     * possible, if the channel is in blocking mode. If the channel is
     * nonblocking, the read will never block.
     * Some OSes can throw an interrupt error, for which we should
     * immediately retry. [Bug #415131]
     */

    do {
	bytesRead = read (GetFd(psPtr->inFile), buf, (size_t) toRead);
    } while ((bytesRead < 0) && (errno == EINTR));

    if (bytesRead < 0) {
	*errorCodePtr = errno;
	return -1;
    } else {
	return bytesRead;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PipeOutputProc--
 *
 *	This procedure is invoked from the generic IO level to write
 *	output to a command pipeline based channel.
 *
 * Results:
 *	The number of bytes written is returned or -1 on error. An
 *	output argument	contains a POSIX error code if an error occurred,
 *	or zero.
 *
 * Side effects:
 *	Writes output on the output device of the channel.
 *
 *----------------------------------------------------------------------
 */

static int
PipeOutputProc(instanceData, buf, toWrite, errorCodePtr)
    ClientData instanceData;		/* Pipe state. */
    CONST char *buf;			/* The data buffer. */
    int toWrite;			/* How many bytes to write? */
    int *errorCodePtr;			/* Where to store error code. */
{
    PipeState *psPtr = (PipeState *) instanceData;
    int written;

    *errorCodePtr = 0;

    /*
     * Some OSes can throw an interrupt error, for which we should
     * immediately retry. [Bug #415131]
     */

    do {
	written = write(GetFd(psPtr->outFile), buf, (size_t) toWrite);
    } while ((written < 0) && (errno == EINTR));

    if (written < 0) {
	*errorCodePtr = errno;
	return -1;
    } else {
	return written;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PipeWatchProc --
 *
 *	Initialize the notifier to watch the fds from this channel.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Sets up the notifier so that a future event on the channel will
 *	be seen by Tcl.
 *
 *----------------------------------------------------------------------
 */

static void
PipeWatchProc(instanceData, mask)
    ClientData instanceData;		/* The pipe state. */
    int mask;				/* Events of interest; an OR-ed
                                         * combination of TCL_READABLE,
                                         * TCL_WRITABEL and TCL_EXCEPTION. */
{
    PipeState *psPtr = (PipeState *) instanceData;
    int newmask;

    if (psPtr->inFile) {
	newmask = mask & (TCL_READABLE | TCL_EXCEPTION);
	if (newmask) {
	    Tcl_CreateFileHandler(GetFd(psPtr->inFile), mask,
		    (Tcl_FileProc *) Tcl_NotifyChannel,
		    (ClientData) psPtr->channel);
	} else {
	    Tcl_DeleteFileHandler(GetFd(psPtr->inFile));
	}
    }
    if (psPtr->outFile) {
	newmask = mask & (TCL_WRITABLE | TCL_EXCEPTION);
	if (newmask) {
	    Tcl_CreateFileHandler(GetFd(psPtr->outFile), mask,
		    (Tcl_FileProc *) Tcl_NotifyChannel,
		    (ClientData) psPtr->channel);
	} else {
	    Tcl_DeleteFileHandler(GetFd(psPtr->outFile));
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * PipeGetHandleProc --
 *
 *	Called from Tcl_GetChannelHandle to retrieve OS handles from
 *	inside a command pipeline based channel.
 *
 * Results:
 *	Returns TCL_OK with the fd in handlePtr, or TCL_ERROR if
 *	there is no handle for the specified direction. 
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static int
PipeGetHandleProc(instanceData, direction, handlePtr)
    ClientData instanceData;	/* The pipe state. */
    int direction;		/* TCL_READABLE or TCL_WRITABLE */
    ClientData *handlePtr;	/* Where to store the handle.  */
{
    PipeState *psPtr = (PipeState *) instanceData;

    if (direction == TCL_READABLE && psPtr->inFile) {
	*handlePtr = (ClientData) GetFd(psPtr->inFile);
	return TCL_OK;
    }
    if (direction == TCL_WRITABLE && psPtr->outFile) {
	*handlePtr = (ClientData) GetFd(psPtr->outFile);
	return TCL_OK;
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_WaitPid --
 *
 *	Implements the waitpid system call on Unix systems.
 *
 * Results:
 *	Result of calling waitpid.
 *
 * Side effects:
 *	Waits for a process to terminate.
 *
 *----------------------------------------------------------------------
 */

Tcl_Pid
Tcl_WaitPid(pid, statPtr, options)
    Tcl_Pid pid;
    int *statPtr;
    int options;
{
    int result;
    pid_t real_pid;

    real_pid = (pid_t) pid;
    while (1) {
	result = (int) waitpid(real_pid, statPtr, options);
	if ((result != -1) || (errno != EINTR)) {
	    return (Tcl_Pid) result;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_PidObjCmd --
 *
 *	This procedure is invoked to process the "pid" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_PidObjCmd(dummy, interp, objc, objv)
    ClientData dummy;		/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST *objv;	/* Argument strings. */
{
    Tcl_Channel chan;
    Tcl_ChannelType *chanTypePtr;
    PipeState *pipePtr;
    int i;
    Tcl_Obj *resultPtr, *longObjPtr;

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "?channelId?");
	return TCL_ERROR;
    }
    if (objc == 1) {
	Tcl_SetLongObj(Tcl_GetObjResult(interp), (long) getpid());
    } else {
        chan = Tcl_GetChannel(interp, Tcl_GetString(objv[1]), NULL);
        if (chan == (Tcl_Channel) NULL) {
	    return TCL_ERROR;
	}
	chanTypePtr = Tcl_GetChannelType(chan);
	if (chanTypePtr != &pipeChannelType) {
	    return TCL_OK;
	}
        pipePtr = (PipeState *) Tcl_GetChannelInstanceData(chan);
	resultPtr = Tcl_GetObjResult(interp);
        for (i = 0; i < pipePtr->numPids; i++) {
	    longObjPtr = Tcl_NewLongObj((long) TclpGetPid(pipePtr->pidPtr[i]));
	    Tcl_ListObjAppendElement(NULL, resultPtr, longObjPtr);
	}
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpFinalizePipes --
 *
 *	Cleans up the pipe subsystem from Tcl_FinalizeThread
 *
 * Results:
 *	None.
 *
 * This procedure carries out no operation on Unix.
 *
 *----------------------------------------------------------------------
 */

void
TclpFinalizePipes()
{
}
generated by cgit v0.12 at 2024-07-19 06:07:03 (GMT)