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-rw-r--r--unix/tclLoadAix.c549
1 files changed, 0 insertions, 549 deletions
diff --git a/unix/tclLoadAix.c b/unix/tclLoadAix.c
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index 8fe28a1..0000000
--- a/unix/tclLoadAix.c
+++ /dev/null
@@ -1,549 +0,0 @@
-/*
- * tclLoadAix.c --
- *
- * This file implements the dlopen and dlsym APIs under the
- * AIX operating system, to enable the Tcl "load" command to
- * work. This code was provided by Jens-Uwe Mager.
- *
- * This file is subject to the following copyright notice, which is
- * different from the notice used elsewhere in Tcl. The file has
- * been modified to incorporate the file dlfcn.h in-line.
- *
- * Copyright (c) 1992,1993,1995,1996, Jens-Uwe Mager, Helios Software GmbH
- * Not derived from licensed software.
-
- * Permission is granted to freely use, copy, modify, and redistribute
- * this software, provided that the author is not construed to be liable
- * for any results of using the software, alterations are clearly marked
- * as such, and this notice is not modified.
- *
- * RCS: @(#) $Id: tclLoadAix.c,v 1.3 1999/04/16 00:48:04 stanton Exp $
- *
- * Note: this file has been altered from the original in a few
- * ways in order to work properly with Tcl.
- */
-
-/*
- * @(#)dlfcn.c 1.7 revision of 95/08/14 19:08:38
- * This is an unpublished work copyright (c) 1992 HELIOS Software GmbH
- * 30159 Hannover, Germany
- */
-
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/ldr.h>
-#include <a.out.h>
-#include <ldfcn.h>
-#include "../compat/dlfcn.h"
-
-/*
- * We simulate dlopen() et al. through a call to load. Because AIX has
- * no call to find an exported symbol we read the loader section of the
- * loaded module and build a list of exported symbols and their virtual
- * address.
- */
-
-typedef struct {
- char *name; /* the symbols's name */
- void *addr; /* its relocated virtual address */
-} Export, *ExportPtr;
-
-/*
- * xlC uses the following structure to list its constructors and
- * destructors. This is gleaned from the output of munch.
- */
-typedef struct {
- void (*init)(void); /* call static constructors */
- void (*term)(void); /* call static destructors */
-} Cdtor, *CdtorPtr;
-
-/*
- * The void * handle returned from dlopen is actually a ModulePtr.
- */
-typedef struct Module {
- struct Module *next;
- char *name; /* module name for refcounting */
- int refCnt; /* the number of references */
- void *entry; /* entry point from load */
- struct dl_info *info; /* optional init/terminate functions */
- CdtorPtr cdtors; /* optional C++ constructors */
- int nExports; /* the number of exports found */
- ExportPtr exports; /* the array of exports */
-} Module, *ModulePtr;
-
-/*
- * We keep a list of all loaded modules to be able to call the fini
- * handlers and destructors at atexit() time.
- */
-static ModulePtr modList;
-
-/*
- * The last error from one of the dl* routines is kept in static
- * variables here. Each error is returned only once to the caller.
- */
-static char errbuf[BUFSIZ];
-static int errvalid;
-
-static void caterr(char *);
-static int readExports(ModulePtr);
-static void terminate(void);
-static void *findMain(void);
-
-VOID *dlopen(const char *path, int mode)
-{
- register ModulePtr mp;
- static void *mainModule;
-
- /*
- * Upon the first call register a terminate handler that will
- * close all libraries. Also get a reference to the main module
- * for use with loadbind.
- */
- if (!mainModule) {
- if ((mainModule = findMain()) == NULL)
- return NULL;
- atexit(terminate);
- }
- /*
- * Scan the list of modules if we have the module already loaded.
- */
- for (mp = modList; mp; mp = mp->next)
- if (strcmp(mp->name, path) == 0) {
- mp->refCnt++;
- return (VOID *) mp;
- }
- if ((mp = (ModulePtr)calloc(1, sizeof(*mp))) == NULL) {
- errvalid++;
- strcpy(errbuf, "calloc: ");
- strcat(errbuf, strerror(errno));
- return (VOID *) NULL;
- }
- mp->name = malloc((unsigned) (strlen(path) + 1));
- strcpy(mp->name, path);
- /*
- * load should be declared load(const char *...). Thus we
- * cast the path to a normal char *. Ugly.
- */
- if ((mp->entry = (void *)load((char *)path, L_NOAUTODEFER, NULL)) == NULL) {
- free(mp->name);
- free(mp);
- errvalid++;
- strcpy(errbuf, "dlopen: ");
- strcat(errbuf, path);
- strcat(errbuf, ": ");
- /*
- * If AIX says the file is not executable, the error
- * can be further described by querying the loader about
- * the last error.
- */
- if (errno == ENOEXEC) {
- char *tmp[BUFSIZ/sizeof(char *)];
- if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1)
- strcpy(errbuf, strerror(errno));
- else {
- char **p;
- for (p = tmp; *p; p++)
- caterr(*p);
- }
- } else
- strcat(errbuf, strerror(errno));
- return (VOID *) NULL;
- }
- mp->refCnt = 1;
- mp->next = modList;
- modList = mp;
- if (loadbind(0, mainModule, mp->entry) == -1) {
- dlclose(mp);
- errvalid++;
- strcpy(errbuf, "loadbind: ");
- strcat(errbuf, strerror(errno));
- return (VOID *) NULL;
- }
- /*
- * If the user wants global binding, loadbind against all other
- * loaded modules.
- */
- if (mode & RTLD_GLOBAL) {
- register ModulePtr mp1;
- for (mp1 = mp->next; mp1; mp1 = mp1->next)
- if (loadbind(0, mp1->entry, mp->entry) == -1) {
- dlclose(mp);
- errvalid++;
- strcpy(errbuf, "loadbind: ");
- strcat(errbuf, strerror(errno));
- return (VOID *) NULL;
- }
- }
- if (readExports(mp) == -1) {
- dlclose(mp);
- return (VOID *) NULL;
- }
- /*
- * If there is a dl_info structure, call the init function.
- */
- if (mp->info = (struct dl_info *)dlsym(mp, "dl_info")) {
- if (mp->info->init)
- (*mp->info->init)();
- } else
- errvalid = 0;
- /*
- * If the shared object was compiled using xlC we will need
- * to call static constructors (and later on dlclose destructors).
- */
- if (mp->cdtors = (CdtorPtr)dlsym(mp, "__cdtors")) {
- while (mp->cdtors->init) {
- (*mp->cdtors->init)();
- mp->cdtors++;
- }
- } else
- errvalid = 0;
- return (VOID *) mp;
-}
-
-/*
- * Attempt to decipher an AIX loader error message and append it
- * to our static error message buffer.
- */
-static void caterr(char *s)
-{
- register char *p = s;
-
- while (*p >= '0' && *p <= '9')
- p++;
- switch(atoi(s)) { /* INTL: "C", UTF safe. */
- case L_ERROR_TOOMANY:
- strcat(errbuf, "to many errors");
- break;
- case L_ERROR_NOLIB:
- strcat(errbuf, "can't load library");
- strcat(errbuf, p);
- break;
- case L_ERROR_UNDEF:
- strcat(errbuf, "can't find symbol");
- strcat(errbuf, p);
- break;
- case L_ERROR_RLDBAD:
- strcat(errbuf, "bad RLD");
- strcat(errbuf, p);
- break;
- case L_ERROR_FORMAT:
- strcat(errbuf, "bad exec format in");
- strcat(errbuf, p);
- break;
- case L_ERROR_ERRNO:
- strcat(errbuf, strerror(atoi(++p))); /* INTL: "C", UTF safe. */
- break;
- default:
- strcat(errbuf, s);
- break;
- }
-}
-
-VOID *dlsym(void *handle, const char *symbol)
-{
- register ModulePtr mp = (ModulePtr)handle;
- register ExportPtr ep;
- register int i;
-
- /*
- * Could speed up the search, but I assume that one assigns
- * the result to function pointers anyways.
- */
- for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
- if (strcmp(ep->name, symbol) == 0)
- return ep->addr;
- errvalid++;
- strcpy(errbuf, "dlsym: undefined symbol ");
- strcat(errbuf, symbol);
- return NULL;
-}
-
-char *dlerror(void)
-{
- if (errvalid) {
- errvalid = 0;
- return errbuf;
- }
- return NULL;
-}
-
-int dlclose(void *handle)
-{
- register ModulePtr mp = (ModulePtr)handle;
- int result;
- register ModulePtr mp1;
-
- if (--mp->refCnt > 0)
- return 0;
- if (mp->info && mp->info->fini)
- (*mp->info->fini)();
- if (mp->cdtors)
- while (mp->cdtors->term) {
- (*mp->cdtors->term)();
- mp->cdtors++;
- }
- result = unload(mp->entry);
- if (result == -1) {
- errvalid++;
- strcpy(errbuf, strerror(errno));
- }
- if (mp->exports) {
- register ExportPtr ep;
- register int i;
- for (ep = mp->exports, i = mp->nExports; i; i--, ep++)
- if (ep->name)
- free(ep->name);
- free(mp->exports);
- }
- if (mp == modList)
- modList = mp->next;
- else {
- for (mp1 = modList; mp1; mp1 = mp1->next)
- if (mp1->next == mp) {
- mp1->next = mp->next;
- break;
- }
- }
- free(mp->name);
- free(mp);
- return result;
-}
-
-static void terminate(void)
-{
- while (modList)
- dlclose(modList);
-}
-
-/*
- * Build the export table from the XCOFF .loader section.
- */
-static int readExports(ModulePtr mp)
-{
- LDFILE *ldp = NULL;
- SCNHDR sh, shdata;
- LDHDR *lhp;
- char *ldbuf;
- LDSYM *ls;
- int i;
- ExportPtr ep;
-
- if ((ldp = ldopen(mp->name, ldp)) == NULL) {
- struct ld_info *lp;
- char *buf;
- int size = 4*1024;
- if (errno != ENOENT) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- return -1;
- }
- /*
- * The module might be loaded due to the LIBPATH
- * environment variable. Search for the loaded
- * module using L_GETINFO.
- */
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- return -1;
- }
- while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
- free(buf);
- size += 4*1024;
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- return -1;
- }
- }
- if (i == -1) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- free(buf);
- return -1;
- }
- /*
- * Traverse the list of loaded modules. The entry point
- * returned by load() does actually point to the data
- * segment origin.
- */
- lp = (struct ld_info *)buf;
- while (lp) {
- if (lp->ldinfo_dataorg == mp->entry) {
- ldp = ldopen(lp->ldinfo_filename, ldp);
- break;
- }
- if (lp->ldinfo_next == 0)
- lp = NULL;
- else
- lp = (struct ld_info *)((char *)lp + lp->ldinfo_next);
- }
- free(buf);
- if (!ldp) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- return -1;
- }
- }
- if (TYPE(ldp) != U802TOCMAGIC) {
- errvalid++;
- strcpy(errbuf, "readExports: bad magic");
- while(ldclose(ldp) == FAILURE)
- ;
- return -1;
- }
- /*
- * Get the padding for the data section. This is needed for
- * AIX 4.1 compilers. This is used when building the final
- * function pointer to the exported symbol.
- */
- if (ldnshread(ldp, _DATA, &shdata) != SUCCESS) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot read data section header");
- while(ldclose(ldp) == FAILURE)
- ;
- return -1;
- }
- if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot read loader section header");
- while(ldclose(ldp) == FAILURE)
- ;
- return -1;
- }
- /*
- * We read the complete loader section in one chunk, this makes
- * finding long symbol names residing in the string table easier.
- */
- if ((ldbuf = (char *)malloc(sh.s_size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- while(ldclose(ldp) == FAILURE)
- ;
- return -1;
- }
- if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot seek to loader section");
- free(ldbuf);
- while(ldclose(ldp) == FAILURE)
- ;
- return -1;
- }
- if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) {
- errvalid++;
- strcpy(errbuf, "readExports: cannot read loader section");
- free(ldbuf);
- while(ldclose(ldp) == FAILURE)
- ;
- return -1;
- }
- lhp = (LDHDR *)ldbuf;
- ls = (LDSYM *)(ldbuf+LDHDRSZ);
- /*
- * Count the number of exports to include in our export table.
- */
- for (i = lhp->l_nsyms; i; i--, ls++) {
- if (!LDR_EXPORT(*ls))
- continue;
- mp->nExports++;
- }
- if ((mp->exports = (ExportPtr)calloc(mp->nExports, sizeof(*mp->exports))) == NULL) {
- errvalid++;
- strcpy(errbuf, "readExports: ");
- strcat(errbuf, strerror(errno));
- free(ldbuf);
- while(ldclose(ldp) == FAILURE)
- ;
- return -1;
- }
- /*
- * Fill in the export table. All entries are relative to
- * the entry point we got from load.
- */
- ep = mp->exports;
- ls = (LDSYM *)(ldbuf+LDHDRSZ);
- for (i = lhp->l_nsyms; i; i--, ls++) {
- char *symname;
- char tmpsym[SYMNMLEN+1];
- if (!LDR_EXPORT(*ls))
- continue;
- if (ls->l_zeroes == 0)
- symname = ls->l_offset+lhp->l_stoff+ldbuf;
- else {
- /*
- * The l_name member is not zero terminated, we
- * must copy the first SYMNMLEN chars and make
- * sure we have a zero byte at the end.
- */
- strncpy(tmpsym, ls->l_name, SYMNMLEN);
- tmpsym[SYMNMLEN] = '\0';
- symname = tmpsym;
- }
- ep->name = malloc((unsigned) (strlen(symname) + 1));
- strcpy(ep->name, symname);
- ep->addr = (void *)((unsigned long)mp->entry +
- ls->l_value - shdata.s_vaddr);
- ep++;
- }
- free(ldbuf);
- while(ldclose(ldp) == FAILURE)
- ;
- return 0;
-}
-
-/*
- * Find the main modules entry point. This is used as export pointer
- * for loadbind() to be able to resolve references to the main part.
- */
-static void * findMain(void)
-{
- struct ld_info *lp;
- char *buf;
- int size = 4*1024;
- int i;
- void *ret;
-
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "findMain: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) {
- free(buf);
- size += 4*1024;
- if ((buf = malloc(size)) == NULL) {
- errvalid++;
- strcpy(errbuf, "findMain: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- }
- if (i == -1) {
- errvalid++;
- strcpy(errbuf, "findMain: ");
- strcat(errbuf, strerror(errno));
- free(buf);
- return NULL;
- }
- /*
- * The first entry is the main module. The entry point
- * returned by load() does actually point to the data
- * segment origin.
- */
- lp = (struct ld_info *)buf;
- ret = lp->ldinfo_dataorg;
- free(buf);
- return ret;
-}
-
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