271 lines
6.5 KiB
C
Executable File
271 lines
6.5 KiB
C
Executable File
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: load_dl.c *
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* comments: dl based dynamic loaderr of external routines *
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* tested on i486-linuxelf *
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*************************************************************************/
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#include "Yap.h"
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#include "YapHeap.h"
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#include "Yatom.h"
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#include "yapio.h"
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#include "Foreign.h"
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#if LOAD_DL
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// use SWI-Prolog code if all else fails
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char *findExecutable(const char *av0, char *buffer);
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#if defined(__APPLE__)
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#include <dlfcn.h>
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#include <mach-o/dyld.h>
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#endif
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typedef void (*prismf)(void);
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/* only works for dlls */
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int Yap_CallFunctionByName(const char *thing_string);
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int Yap_CallFunctionByName(const char *thing_string) {
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void *handle = dlopen(NULL, RTLD_LAZY
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#ifndef __CYGWIN__
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#ifdef RTLD_NOLOAD
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| RTLD_NOLOAD
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#endif
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#endif
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);
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// you could do RTLD_NOW as well. shouldn't matter
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if (!handle) {
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CACHE_REGS
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Yap_Error(SYSTEM_ERROR_INTERNAL, ARG1,
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"Dynamic linking on main module : %s\n", dlerror());
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}
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prismf *addr = (prismf *)dlsym(handle, thing_string);
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if (addr)
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(*addr)();
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dlclose(handle);
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return TRUE;
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}
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/*
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* YAP_FindExecutable(argv[0]) should be called on yap initialization to
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* locate the executable of Yap
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*/
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char *Yap_FindExecutable(void) {
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#if HAVE_GETEXECNAME
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// Solaris
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return getexecname();
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#elif __APPLE__
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char *buf = malloc(YAP_FILENAME_MAX);
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uint32_t size;
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if (!_NSGetExecutablePath(buf, &size)) {
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buf = realloc(buf, size + 1);
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return buf;
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}
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return "yap";
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#elif defined(__linux__)
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char *buf = malloc(YAP_FILENAME_MAX);
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ssize_t len = readlink("/proc/self/exe", buf, YAP_FILENAME_MAX - 1);
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if (len != -1) {
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buf[len] = '\0';
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return buf;
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}
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// follow through to standard method
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#elif defined(__FreeBSD__) || defined(__DragonFly__)
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enum { BUFFERSIZE = 1024 };
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char *buf = malloc(BUFFERSIZE);
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ssize_t len = readlink("/proc/curproc/file", buf, sizeof(buf) - 1);
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if (len != -1) {
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buf[len] = '\0';
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return buf;
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}
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int mib[4];
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PATHNAME;
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mib[3] = -1; // current process
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size_t cb = BUFFERSIZE;
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sysctl(mib, 4, buf, &cb, NULL, 0);
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// follow through to standard method
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#endif
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return NULL;
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}
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void *Yap_LoadForeignFile(char *file, int flags) {
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CACHE_REGS
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int dlflag;
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void *out;
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if (flags & EAGER_LOADING)
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dlflag = RTLD_NOW;
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else
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dlflag = RTLD_LAZY;
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if (flags & GLOBAL_LOADING)
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dlflag |= RTLD_GLOBAL;
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#ifndef __CYGWIN__
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else
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dlflag |= RTLD_LOCAL;
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#endif
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out = (void *)dlopen(file, dlflag);
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if (out == NULL) {
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const char *m_os = dlerror();
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if (m_os) {
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LOCAL_ErrorMessage = malloc(MAX_ERROR_MSG_SIZE);
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strncpy(LOCAL_ErrorMessage, m_os, MAX_ERROR_MSG_SIZE - 1);
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} else {
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LOCAL_ErrorMessage = "dlopen failed";
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}
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}
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return out;
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}
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int Yap_CallForeignFile(void *handle, char *f) {
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YapInitProc proc = (YapInitProc)dlsym(handle, f);
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if (!proc) {
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/* Yap_Error(SYSTEM_ERROR_INTERNAL, ARG1, "dlsym error %s\n", dlerror());*/
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return FALSE;
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}
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(*proc)();
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return TRUE;
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}
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int Yap_CloseForeignFile(void *handle) {
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if (dlclose(handle) < 0) {
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CACHE_REGS
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Yap_Error(SYSTEM_ERROR_INTERNAL, ARG1, "dlclose error %s\n", dlerror());
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return -1;
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}
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return 0;
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}
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/*
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* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
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* code files and libraries and locates an initialization routine
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*/
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static Int LoadForeign(StringList
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ofiles, StringList libs, char *proc_name,
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YapInitProc *init_proc) {
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CACHE_REGS
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LOCAL_ErrorMessage = NULL;
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while (libs) {
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const char *file = AtomName(libs->name);
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#ifdef __osf__
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if ((libs->handle = dlopen(LOCAL_FileNameBuf, RTLD_LAZY)) == NULL)
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#else
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if ((libs->handle = dlopen(file, RTLD_LAZY | RTLD_GLOBAL)) ==
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NULL)
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#endif
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{
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if (LOCAL_ErrorMessage == NULL) {
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LOCAL_ErrorMessage = malloc(MAX_ERROR_MSG_SIZE);
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strcpy(LOCAL_ErrorMessage, dlerror());
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}
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}
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libs = libs->next;
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}
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while (ofiles) {
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/* load libraries first so that their symbols are available to
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other routines */
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const char *file = AtomName(ofiles->name);
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if ((ofiles->handle = dlopen(file, RTLD_LAZY | RTLD_GLOBAL)) ==
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NULL)
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{
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if (LOCAL_ErrorMessage == NULL) {
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LOCAL_ErrorMessage = malloc(MAX_ERROR_MSG_SIZE);
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fprintf(stderr, "dlopen of image %s failed: %s\n", LOCAL_FileNameBuf,
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dlerror());
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}
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}
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if (ofiles->handle && proc_name && !*init_proc)
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*init_proc = (YapInitProc)dlsym(ofiles->handle, proc_name);
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ofiles = ofiles->next;
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}
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if (!*init_proc && LOCAL_ErrorMessage == NULL) {
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char *buf = malloc(1058);
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snprintf(buf, 1058 - 1, "Could not locate routine %s in %s: %s\n",
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proc_name, LOCAL_FileNameBuf, dlerror());
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return LOAD_FAILLED;
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}
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return LOAD_SUCCEEDED;
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}
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Int Yap_LoadForeign(StringList ofiles, StringList libs, char *proc_name,
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YapInitProc *init_proc) {
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return LoadForeign(ofiles, libs, proc_name, init_proc);
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}
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void Yap_ShutdownLoadForeign(void) {
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ForeignObj *f_code;
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f_code = ForeignCodeLoaded;
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while (f_code != NULL) {
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StringList objs, libs, old;
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ForeignObj *of_code = f_code;
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objs = f_code->objs;
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while (objs != NULL) {
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old = objs;
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if (dlclose(objs->handle) != 0)
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return; /* ERROR */
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objs = objs->next;
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Yap_FreeCodeSpace((ADDR)old);
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}
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libs = f_code->libs;
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while (libs != NULL) {
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old = libs;
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if (dlclose(libs->handle) != 0)
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return; /* ERROR */
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libs = libs->next;
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Yap_FreeCodeSpace((ADDR)old);
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}
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f_code = f_code->next;
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Yap_FreeCodeSpace((ADDR)of_code);
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}
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/*
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make sure that we don't try to close foreign code several times, eg,
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from within an error handler
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*/
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ForeignCodeLoaded = NULL;
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}
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Int Yap_ReLoadForeign(StringList ofiles, StringList libs, char *proc_name,
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YapInitProc *init_proc) {
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return (LoadForeign(ofiles, libs, proc_name, init_proc));
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}
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#endif
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#if SIMICS
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void dlopen(void) {}
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void dlclose(void) {}
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void dlsym(void) {}
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#endif
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