diff options
Diffstat (limited to 'generic/tclIOUtil.c')
| -rw-r--r-- | generic/tclIOUtil.c | 153 |
1 files changed, 130 insertions, 23 deletions
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c index 6259216..1d4f277 100644 --- a/generic/tclIOUtil.c +++ b/generic/tclIOUtil.c @@ -19,11 +19,17 @@ */ #include "tclInt.h" -#ifdef __WIN32__ +#ifdef _WIN32 # include "tclWinInt.h" #endif #include "tclFileSystem.h" +#ifdef TCL_TEMPLOAD_NO_UNLINK +#ifndef NO_FSTATFS +#include <sys/statfs.h> +#endif +#endif + /* * struct FilesystemRecord -- * @@ -53,12 +59,12 @@ typedef struct FilesystemRecord { typedef struct ThreadSpecificData { int initialized; - int cwdPathEpoch; - int filesystemEpoch; + size_t cwdPathEpoch; + size_t filesystemEpoch; Tcl_Obj *cwdPathPtr; ClientData cwdClientData; FilesystemRecord *filesystemList; - int claims; + size_t claims; } ThreadSpecificData; /* @@ -209,7 +215,7 @@ static FilesystemRecord nativeFilesystemRecord = { * trigger cache cleanup in all threads. */ -static int theFilesystemEpoch = 1; +static size_t theFilesystemEpoch = 1; /* * Stores the linked list of filesystems. A 1:1 copy of this list is also @@ -225,7 +231,7 @@ TCL_DECLARE_MUTEX(filesystemMutex) */ static Tcl_Obj *cwdPathPtr = NULL; -static int cwdPathEpoch = 0; +static size_t cwdPathEpoch = 0; static ClientData cwdClientData = NULL; TCL_DECLARE_MUTEX(cwdMutex) @@ -639,7 +645,7 @@ FsGetFirstFilesystem(void) int TclFSEpochOk( - int filesystemEpoch) + size_t filesystemEpoch) { return (filesystemEpoch == 0 || filesystemEpoch == theFilesystemEpoch); } @@ -660,7 +666,7 @@ Disclaim(void) tsdPtr->claims--; } -int +size_t TclFSEpoch(void) { ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); @@ -707,7 +713,9 @@ FsUpdateCwd( cwdClientData = TclNativeDupInternalRep(clientData); } - cwdPathEpoch++; + if (++cwdPathEpoch == 0) { + ++cwdPathEpoch; + } tsdPtr->cwdPathEpoch = cwdPathEpoch; Tcl_MutexUnlock(&cwdMutex); @@ -784,7 +792,9 @@ TclFinalizeFilesystem(void) } fsRecPtr = tmpFsRecPtr; } - theFilesystemEpoch++; + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } filesystemList = NULL; /* @@ -792,7 +802,7 @@ TclFinalizeFilesystem(void) * filesystem is likely to fail. */ -#ifdef __WIN32__ +#ifdef _WIN32 TclWinEncodingsCleanup(); #endif } @@ -817,9 +827,11 @@ void TclResetFilesystem(void) { filesystemList = &nativeFilesystemRecord; - theFilesystemEpoch++; + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } -#ifdef __WIN32__ +#ifdef _WIN32 /* * Cleans up the win32 API filesystem proc lookup table. This must happen * very late in finalization so that deleting of copied dlls can occur. @@ -902,7 +914,9 @@ Tcl_FSRegister( * conceivably now belong to different filesystems. */ - theFilesystemEpoch++; + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } Tcl_MutexUnlock(&filesystemMutex); return TCL_OK; @@ -967,7 +981,9 @@ Tcl_FSUnregister( * (which would of course lead to memory exceptions). */ - theFilesystemEpoch++; + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } ckfree(fsRecPtr); @@ -1298,7 +1314,9 @@ Tcl_FSMountsChanged( */ Tcl_MutexLock(&filesystemMutex); - theFilesystemEpoch++; + if (++theFilesystemEpoch == 0) { + ++theFilesystemEpoch; + } Tcl_MutexUnlock(&filesystemMutex); } @@ -2884,9 +2902,13 @@ int Tcl_FSChdir( Tcl_Obj *pathPtr) { - const Tcl_Filesystem *fsPtr; + const Tcl_Filesystem *fsPtr, *oldFsPtr = NULL; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); int retVal = -1; + if (tsdPtr->cwdPathPtr != NULL) { + oldFsPtr = Tcl_FSGetFileSystemForPath(tsdPtr->cwdPathPtr); + } if (Tcl_FSGetNormalizedPath(NULL, pathPtr) == NULL) { Tcl_SetErrno(ENOENT); return retVal; @@ -2986,7 +3008,6 @@ Tcl_FSChdir( * instead. This should be examined by someone on Unix. */ - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey); ClientData cd; ClientData oldcd = tsdPtr->cwdClientData; @@ -3003,6 +3024,14 @@ Tcl_FSChdir( } else { FsUpdateCwd(normDirName, NULL); } + + /* + * If the filesystem changed between old and new cwd + * force filesystem refresh on path objects. + */ + if (oldFsPtr != NULL && fsPtr != oldFsPtr) { + Tcl_FSMountsChanged(NULL); + } } return retVal; @@ -3110,6 +3139,82 @@ Tcl_FSLoadFile( *---------------------------------------------------------------------- */ +/* + * Workaround for issue with modern HPUX which do allow the unlink (no ETXTBSY + * error) yet somehow trash some internal data structures which prevents the + * second and further shared libraries from getting properly loaded. Only the + * first is ok. We try to get around the issue by not unlinking, + * i.e. emulating the behaviour of the older HPUX which denied removal. + * + * Doing the unlink is also an issue within docker containers, whose AUFS + * bungles this as well, see + * https://github.com/dotcloud/docker/issues/1911 + * + * For these situations the change below makes the execution of the unlink + * semi-controllable at runtime. + * + * An AUFS filesystem (if it can be detected) will force avoidance of + * unlink. The env variable TCL_TEMPLOAD_NO_UNLINK allows detection of a + * users general request (unlink and not. + * + * By default the unlink is done (if not in AUFS). However if the variable is + * present and set to true (any integer > 0) then the unlink is skipped. + */ + +int +TclSkipUnlink (Tcl_Obj* shlibFile) +{ + /* Order of testing: + * 1. On hpux we generally want to skip unlink in general + * + * Outside of hpux then: + * 2. For a general user request (TCL_TEMPLOAD_NO_UNLINK present, non-empty, => int) + * 3. For general AUFS environment (statfs, if available). + * + * Ad 2: This variable can disable/override the AUFS detection, i.e. for + * testing if a newer AUFS does not have the bug any more. + * + * Ad 3: This is conditionally compiled in. Condition currently must be set manually. + * This part needs proper tests in the configure(.in). + */ + +#ifdef hpux + return 1; +#else + char* skipstr; + + skipstr = getenv ("TCL_TEMPLOAD_NO_UNLINK"); + if (skipstr && (skipstr[0] != '\0')) { + return atoi(skipstr); + } + +#ifdef TCL_TEMPLOAD_NO_UNLINK +#ifndef NO_FSTATFS + { + struct statfs fs; + /* Have fstatfs. May not have the AUFS super magic ... Indeed our build + * box is too old to have it directly in the headers. Define taken from + * http://mooon.googlecode.com/svn/trunk/linux_include/linux/aufs_type.h + * http://aufs.sourceforge.net/ + * Better reference will be gladly taken. + */ +#ifndef AUFS_SUPER_MAGIC +#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') +#endif /* AUFS_SUPER_MAGIC */ + if ((statfs(Tcl_GetString (shlibFile), &fs) == 0) && + (fs.f_type == AUFS_SUPER_MAGIC)) { + return 1; + } + } +#endif /* ... NO_FSTATFS */ +#endif /* ... TCL_TEMPLOAD_NO_UNLINK */ + + /* Fallback: !hpux, no EV override, no AUFS (detection, nor detected): + * Don't skip */ + return 0; +#endif /* hpux */ +} + int Tcl_LoadFile( Tcl_Interp *interp, /* Used for error reporting. */ @@ -3255,7 +3360,7 @@ Tcl_LoadFile( return TCL_ERROR; } -#ifndef __WIN32__ +#ifndef _WIN32 /* * Do we need to set appropriate permissions on the file? This may be * required on some systems. On Unix we could loop over the file @@ -3300,7 +3405,9 @@ Tcl_LoadFile( * avoids any worries about leaving the copy laying around on exit. */ - if (Tcl_FSDeleteFile(copyToPtr) == TCL_OK) { + if ( + !TclSkipUnlink (copyToPtr) && + (Tcl_FSDeleteFile(copyToPtr) == TCL_OK)) { Tcl_DecrRefCount(copyToPtr); /* @@ -3376,7 +3483,7 @@ Tcl_LoadFile( return retVal; resolveSymbols: - /* + /* * At this point, *handlePtr is already set up to the handle for the * loaded library. We now try to resolve the symbols. */ @@ -3385,7 +3492,7 @@ Tcl_LoadFile( for (i=0 ; symbols[i] != NULL; i++) { procPtrs[i] = Tcl_FindSymbol(interp, *handlePtr, symbols[i]); if (procPtrs[i] == NULL) { - /* + /* * At least one symbol in the list was not found. Unload the * file, and report the problem back to the caller. * (Tcl_FindSymbol should already have left an appropriate @@ -3405,7 +3512,7 @@ Tcl_LoadFile( *---------------------------------------------------------------------- * * DivertFindSymbol -- - * + * * Find a symbol in a shared library loaded by copy-from-VFS. * *---------------------------------------------------------------------- |