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-rw-r--r--src/backend/port/dynloader/aix.c611
1 files changed, 3 insertions, 608 deletions
diff --git a/src/backend/port/dynloader/aix.c b/src/backend/port/dynloader/aix.c
index ee8722b8838..fcf4122d2a7 100644
--- a/src/backend/port/dynloader/aix.c
+++ b/src/backend/port/dynloader/aix.c
@@ -1,612 +1,7 @@
/*
- * $PostgreSQL: pgsql/src/backend/port/dynloader/aix.c,v 1.20 2008/05/17 01:28:23 adunstan Exp $
+ * $PostgreSQL: pgsql/src/backend/port/dynloader/aix.c,v 1.21 2009/04/21 21:15:50 tgl Exp $
*
+ * Dummy file used for nothing at this point
*
- * @(#)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- * This is an unpublished work copyright (c) 1992 HELIOS Software GmbH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
+ * see aix.h
*/
-
-#include "postgres.h"
-
-#include "sys/ldr.h"
-#include <a.out.h>
-#include "ldfcn.h"
-
-#include "dynloader.h"
-
-#ifndef HAVE_DLOPEN
-
-/*
- * AIX 4.3 and up has dlopen() and friends in -ldl.
- * A la long, the homebrewn dl*() functions below should be obsolete.
- */
-
-/*
- * 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;
-
-extern char *strdup(const char *);
-static void caterr(char *);
-static int readExports(ModulePtr);
-static void terminate(void);
-static void *findMain(void);
-
-void *
-dlopen(const char *path, int mode)
-{
- 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 mp;
- }
- if ((mp = (ModulePtr) calloc(1, sizeof(*mp))) == NULL)
- {
- errvalid++;
- strcpy(errbuf, "calloc: ");
- strcat(errbuf, strerror(errno));
- return NULL;
- }
- if ((mp->name = strdup(path)) == NULL)
- {
- errvalid++;
- strcpy(errbuf, "strdup: ");
- strcat(errbuf, strerror(errno));
- free(mp);
- return NULL;
- }
-
- /*
- * 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 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 NULL;
- }
-
- /*
- * If the user wants global binding, loadbind against all other loaded
- * modules.
- */
- if (mode & RTLD_GLOBAL)
- {
- 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 NULL;
- }
- }
- if (readExports(mp) == -1)
- {
- dlclose(mp);
- return 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 mp;
-}
-
-/*
- * Attempt to decipher an AIX loader error message and append it
- * to our static error message buffer.
- */
-static void
-caterr(char *s)
-{
- char *p = s;
-
- while (*p >= '0' && *p <= '9')
- p++;
- switch (atoi(s))
- {
- case L_ERROR_TOOMANY:
- strcat(errbuf, "to many errors");
- break;
- case L_ERROR_NOLIB:
- strcat(errbuf, "cannot load library");
- strcat(errbuf, p);
- break;
- case L_ERROR_UNDEF:
- strcat(errbuf, "cannot 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)));
- break;
- default:
- strcat(errbuf, s);
- break;
- }
-}
-
-void *
-dlsym(void *handle, const char *symbol)
-{
- ModulePtr mp = (ModulePtr) handle;
- ExportPtr ep;
- 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)
-{
- ModulePtr mp = (ModulePtr) handle;
- int result;
- 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)
- {
- ExportPtr ep;
- 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 = strdup(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;
-}
-
-#endif /* HAVE_DLOPEN */
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