/* dl_aix.xs * * Written: 8/31/94 by Wayne Scott (wscott@ichips.intel.com) * * All I did was take Jens-Uwe Mager's libdl emulation library for * AIX and merged it with the dl_dlopen.xs file to create a dynamic library * package that works for AIX. * * I did change all malloc's, free's, strdup's, calloc's to use the perl * equilvant. I also removed some stuff we will not need. Call fini() * on statup... It can probably be trimmed more. */ /* * @(#)dlfcn.c 1.5 revision of 93/02/14 20:14:17 * This is an unpublished work copyright (c) 1992 Helios Software GmbH * 3000 Hannover 1, Germany */ #include "EXTERN.h" #include "perl.h" #include "XSUB.h" #include #include #include #include #include #include #include #include /* * AIX 4.3 does remove some useful definitions from ldfcn.h. Define * these here to compensate for that lossage. */ #ifndef BEGINNING # define BEGINNING SEEK_SET #endif #ifndef FSEEK # define FSEEK(ldptr,o,p) fseek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr) +o):o,p) #endif #ifndef FREAD # define FREAD(p,s,n,ldptr) fread(p,s,n,IOPTR(ldptr)) #endif /* If using PerlIO, redefine these macros from */ #ifdef USE_PERLIO #define FSEEK(ldptr,o,p) PerlIO_seek(IOPTR(ldptr),(p==BEGINNING)?(OFFSET(ldptr)+o):o,p) #define FREAD(p,s,n,ldptr) PerlIO_read(IOPTR(ldptr),p,s*n) #endif /* * 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; /* * 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 */ 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 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); static char *strerror_failed = "(strerror failed)"; static char *strerror_r_failed = "(strerror_r failed)"; char *strerrorcat(char *str, int err) { int strsiz = strlen(str); int msgsiz; char *msg; #ifdef USE_THREADS char *buf = malloc(BUFSIZ); if (buf == 0) return 0; if (strerror_r(err, buf, sizeof(buf)) == 0) msg = buf; else msg = strerror_r_failed; msgsiz = strlen(msg); if (strsiz + msgsiz < BUFSIZ) strcat(str, msg); free(buf); #else if ((msg = strerror(err)) == 0) msg = strerror_failed; msgsiz = strlen(msg); /* Note msg = buf and free() above. */ if (strsiz + msgsiz < BUFSIZ) /* Do not move this after #endif. */ strcat(str, msg); #endif return str; } char *strerrorcpy(char *str, int err) { int msgsiz; char *msg; #ifdef USE_THREADS char *buf = malloc(BUFSIZ); if (buf == 0) return 0; if (strerror_r(err, buf, sizeof(buf)) == 0) msg = buf; else msg = strerror_r_failed; msgsiz = strlen(msg); if (msgsiz < BUFSIZ) strcpy(str, msg); free(buf); #else if ((msg = strerror(err)) == 0) msg = strerror_failed; msgsiz = strlen(msg); /* Note msg = buf and free() above. */ if (msgsiz < BUFSIZ) /* Do not move this after #endif. */ strcpy(str, msg); #endif return str; } /* ARGSUSED */ void *dlopen(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 have the module already loaded. */ for (mp = modList; mp; mp = mp->next) if (strcmp(mp->name, path) == 0) { mp->refCnt++; return mp; } Newz(1000,mp,1,Module); if (mp == NULL) { errvalid++; strcpy(errbuf, "Newz: "); strerrorcat(errbuf, errno); return NULL; } if ((mp->name = savepv(path)) == NULL) { errvalid++; strcpy(errbuf, "savepv: "); strerrorcat(errbuf, errno); safefree(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) { safefree(mp->name); safefree(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) strerrorcpy(errbuf, errno); else { char **p; for (p = tmp; *p; p++) caterr(*p); } } else strerrorcat(errbuf, errno); return NULL; } mp->refCnt = 1; mp->next = modList; modList = mp; if (loadbind(0, mainModule, mp->entry) == -1) { dlclose(mp); errvalid++; strcpy(errbuf, "loadbind: "); strerrorcat(errbuf, errno); return NULL; } if (readExports(mp) == -1) { dlclose(mp); return NULL; } return 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)) { 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: strerrorcat(errbuf, atoi(++p)); 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 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; result = unload(mp->entry); if (result == -1) { errvalid++; strerrorcpy(errbuf, errno); } if (mp->exports) { register ExportPtr ep; register int i; for (ep = mp->exports, i = mp->nExports; i; i--, ep++) if (ep->name) safefree(ep->name); safefree(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; } } safefree(mp->name); safefree(mp); return result; } static void terminate(void) { while (modList) dlclose(modList); } /* Added by Wayne Scott * This is needed because the ldopen system call calls * calloc to allocated a block of date. The ldclose call calls free. * Without this we get this system calloc and perl's free, resulting * in a "Bad free" message. This way we always use perl's malloc. */ void *calloc(size_t ne, size_t sz) { void *out; out = (void *) safemalloc(ne*sz); memzero(out, ne*sz); return(out); } /* * Build the export table from the XCOFF .loader section. */ static int readExports(ModulePtr mp) { LDFILE *ldp = NULL; SCNHDR sh; 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: "); strerrorcat(errbuf, errno); return -1; } /* * The module might be loaded due to the LIBPATH * environment variable. Search for the loaded * module using L_GETINFO. */ if ((buf = safemalloc(size)) == NULL) { errvalid++; strcpy(errbuf, "readExports: "); strerrorcat(errbuf, errno); return -1; } while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) { safefree(buf); size += 4*1024; if ((buf = safemalloc(size)) == NULL) { errvalid++; strcpy(errbuf, "readExports: "); strerrorcat(errbuf, errno); return -1; } } if (i == -1) { errvalid++; strcpy(errbuf, "readExports: "); strerrorcat(errbuf, errno); safefree(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); } safefree(buf); if (!ldp) { errvalid++; strcpy(errbuf, "readExports: "); strerrorcat(errbuf, errno); return -1; } } if (TYPE(ldp) != U802TOCMAGIC) { errvalid++; strcpy(errbuf, "readExports: bad magic"); 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 *)safemalloc(sh.s_size)) == NULL) { errvalid++; strcpy(errbuf, "readExports: "); strerrorcat(errbuf, errno); while(ldclose(ldp) == FAILURE) ; return -1; } if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) { errvalid++; strcpy(errbuf, "readExports: cannot seek to loader section"); safefree(ldbuf); while(ldclose(ldp) == FAILURE) ; return -1; } /* This first case is a hack, since it assumes that the 3rd parameter to FREAD is 1. See the redefinition of FREAD above to see how this works. */ #ifdef USE_PERLIO if (FREAD(ldbuf, sh.s_size, 1, ldp) != sh.s_size) { #else if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) { #endif errvalid++; strcpy(errbuf, "readExports: cannot read loader section"); safefree(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++; } Newz(1001, mp->exports, mp->nExports, Export); if (mp->exports == NULL) { errvalid++; strcpy(errbuf, "readExports: "); strerrorcat(errbuf, errno); safefree(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; if (!LDR_EXPORT(*ls)) continue; if (ls->l_zeroes == 0) symname = ls->l_offset+lhp->l_stoff+ldbuf; else symname = ls->l_name; ep->name = savepv(symname); ep->addr = (void *)((unsigned long)mp->entry + ls->l_value); ep++; } safefree(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 = safemalloc(size)) == NULL) { errvalid++; strcpy(errbuf, "findMain: "); strerrorcat(errbuf, errno); return NULL; } while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) { safefree(buf); size += 4*1024; if ((buf = safemalloc(size)) == NULL) { errvalid++; strcpy(errbuf, "findMain: "); strerrorcat(errbuf, errno); return NULL; } } if (i == -1) { errvalid++; strcpy(errbuf, "findMain: "); strerrorcat(errbuf, errno); safefree(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; safefree(buf); return ret; } /* dl_dlopen.xs * * Platform: SunOS/Solaris, possibly others which use dlopen. * Author: Paul Marquess (pmarquess@bfsec.bt.co.uk) * Created: 10th July 1994 * * Modified: * 15th July 1994 - Added code to explicitly save any error messages. * 3rd August 1994 - Upgraded to v3 spec. * 9th August 1994 - Changed to use IV * 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging, * basic FreeBSD support, removed ClearError * */ /* Porting notes: see dl_dlopen.xs */ #include "dlutils.c" /* SaveError() etc */ static void dl_private_init(pTHX) { (void)dl_generic_private_init(aTHX); } MODULE = DynaLoader PACKAGE = DynaLoader BOOT: (void)dl_private_init(aTHX); void * dl_load_file(filename, flags=0) char * filename int flags CODE: DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags)); if (flags & 0x01) Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename); RETVAL = dlopen(filename, 1) ; DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL)); ST(0) = sv_newmortal() ; if (RETVAL == NULL) SaveError(aTHX_ "%s",dlerror()) ; else sv_setiv( ST(0), (IV)RETVAL); void * dl_find_symbol(libhandle, symbolname) void * libhandle char * symbolname CODE: DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_find_symbol(handle=%x, symbol=%s)\n", libhandle, symbolname)); RETVAL = dlsym(libhandle, symbolname); DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " symbolref = %x\n", RETVAL)); ST(0) = sv_newmortal() ; if (RETVAL == NULL) SaveError(aTHX_ "%s",dlerror()) ; else sv_setiv( ST(0), (IV)RETVAL); void dl_undef_symbols() PPCODE: # These functions should not need changing on any platform: void dl_install_xsub(perl_name, symref, filename="$Package") char * perl_name void * symref char * filename CODE: DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n", perl_name, symref)); ST(0) = sv_2mortal(newRV((SV*)newXS(perl_name, (void(*)(pTHX_ CV *))symref, filename))); char * dl_error() CODE: RETVAL = LastError ; OUTPUT: RETVAL # end.