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yap-6.3/C/load_aout.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: load_aout.c *
* comments: aout based dynamic loader of external routines *
* *
*************************************************************************/
#include "Yap.h"
#include "yapio.h"
#include "Foreign.h"
#ifdef A_OUT
this code is no being maintained anymore
#include <stdio.h>
#if STDC_HEADERS
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <a.out.h>
#define oktox(n) \
(0==stat(n,&stbuf)&&(stbuf.st_mode&S_IFMT)==S_IFREG&&0==access(n,X_OK))
#define oktow(n) \
(0==stat(n,&stbuf)&&(stbuf.st_mode&S_IFMT)==S_IFDIR&&0==access(n,W_OK))
/*
* YAP_FindExecutable(argv[0]) should be called on yap initialization to
* locate the executable of Yap
*/
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char *
Yap_FindExecutable(void)
{
register char *cp, *cp2;
struct stat stbuf;
cp = (char *)getenv("PATH");
if (cp == NULL)
cp = ".:/usr/ucb:/bin:/usr/bin:/usr/local/bin";
if (*GLOBAL_argv[0] == '/') {
if (oktox(GLOBAL_argv[0])) {
strcpy(LOCAL_FileNameBuf, GLOBAL_argv[0]);
Yap_AbsoluteFileInBuffer(LOCAL_FileNameBuf, true);
strncpy( GLOBAL_Executable, LOCAL_FileNameBuf, YAP_MAXPATHLEN);
return;
}
}
if (*cp == ':')
cp++;
for (; *cp;) {
/*
* copy over current directory and then append
* argv[0]
*/
for (cp2 = LOCAL_FileNameBuf; (*cp) != 0 && (*cp) != ':';)
*cp2++ = *cp++;
*cp2++ = '/';
strcpy(cp2, GLOBAL_argv[0]);
if (*cp)
cp++;
if (!oktox(LOCAL_FileNameBuf))
continue;
Yap_AbsoluteFileInBuffer(Yap_AbsoluteFileInBuffer(LOCAL_FileNameBuf, GLOBAL_Executable, TRUE);
return;
}
/* one last try for dual systems */
strcpy(LOCAL_FileNameBuf, GLOBAL_argv[0]);
Yap_AbsoluteFileInBuffer(Yap_AbsoluteFileInBuffer(LOCAL_FileNameBuf, GLOBAL_Executable, TRUE);
if (oktox(GLOBAL_Executable))
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return GLOBAL_Executable;
else
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Yap_Error(SYSTEM_ERROR_INTERNAL,MkAtomTerm(Yap_LookupAtom(GLOBAL_Executable)),
"cannot find file being executed");
}
void *
Yap_LoadForeignFile(char *file, int flags)
{
/* not implemented */
return NULL;
}
int
Yap_CallForeignFile(void *handle, char *f)
{
return FALSE;
}
int
Yap_CloseForeignFile(void *handle)
{
return -1;
}
/*
* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
* code files and libraries and locates an initialization routine
*/
static int
LoadForeign(StringList ofiles,
StringList libs,
char *proc_name,
YapInitProc *init_proc)
{
char command[2*MAXPATHLEN];
char o_files[1024]; /* list of objects we want to load
*/
char l_files[1024]; /* list of libraries we want to
load */
char tmp_buff[32] = "/tmp/YAP_TMP_XXXXXX"; /* used for
mktemp */
char *tfile; /* name of temporary file */
int fildes; /* temp file descriptor */
struct exec header; /* header for loaded file */
unsigned long loadImageSize, firstloadImSz; /* size of image we will load */
char *FCodeBase; /* where we load foreign code */
/*
* put in a string the names of the files you want to load and of any
* libraries you want to use
*/
/* files first */
*o_files = '\0';
{
StringList tmp = ofiles;
while(tmp != NULL) {
strcat(o_files," ");
strcat(o_files,AtomName(tmp->name));
tmp = tmp->next;
}
}
/* same_trick for libraries */
*l_files = '\0';
{
StringList tmp = libs;
while(tmp != NULL) {
strcat(l_files," ");
strcat(l_files,AtomName(tmp->name));
tmp = tmp->next;
}
}
/* next, create a temp file to serve as loader output */
tfile = mktemp(tmp_buff);
/* prepare the magic */
if (strlen(o_files) + strlen(l_files) + strlen(proc_name) +
strlen(GLOBAL_Executable) > 2*MAXPATHLEN) {
strcpy(LOCAL_ErrorSay, " too many parameters in load_foreign/3 ");
return LOAD_FAILLED;
}
sprintf(command, "/usr/bin/ld -N -A %s -o %s -u _%s %s %s -lc",
GLOBAL_Executable,
tfile, proc_name, o_files, l_files);
/* now, do the magic */
if (system(command) != 0) {
unlink(tfile);
strcpy(LOCAL_ErrorSay," ld returned error status in load_foreign_files ");
return LOAD_FAILLED;
}
/* now check the music has played */
if ((fildes = open(tfile, O_RDONLY)) < 0) {
strcpy(LOCAL_ErrorSay," unable to open temp file in load_foreign_files ");
return LOAD_FAILLED;
}
/* it did, get the mice */
/* first, get the header */
read(fildes, (char *) &header, sizeof(header));
close(fildes);
/* get the full size of what we need to load */
loadImageSize = header.a_text + header.a_data + header.a_bss;
/* add 16 just to play it safe */
loadImageSize += 16;
/* keep this copy */
firstloadImSz = loadImageSize;
/* now fetch the space we need */
if (!(FCodeBase = Yap_AllocCodeSpace((int) loadImageSize))) {
strcpy(LOCAL_ErrorSay," unable to allocate space for external code ");
return LOAD_FAILLED;
}
/* now, a new incantation to load the new foreign code */
sprintf(command, "/usr/bin/ld -N -A %s -T %lx -o %s -u _%s %s %s -lc",
GLOBAL_Executable,
(unsigned long) FCodeBase,
tfile, proc_name, o_files, l_files);
/* and do it */
if (system(command) != 0) {
unlink(tfile);
strcpy(LOCAL_ErrorSay," ld returned error status in load_foreign_files ");
return LOAD_FAILLED;
}
if ((fildes = open(tfile, O_RDONLY)) < 0) {
strcpy(LOCAL_ErrorSay," unable to open temp file in load_foreign_files ");
return LOAD_FAILLED;
}
read(fildes, (char *) &header, sizeof(header));
loadImageSize = header.a_text + header.a_data + header.a_bss;
if (firstloadImSz < loadImageSize) {
strcpy(LOCAL_ErrorSay," miscalculation in load_foreign/3 ");
return LOAD_FAILLED;
}
/* now search for our init function */
{
char entry_fun[256];
struct nlist func_info[2];
sprintf(entry_fun, "_%s", proc_name);
func_info[0].n_un.n_name = entry_fun;
func_info[1].n_un.n_name = NULL;
if (nlist(tfile, func_info) == -1) {
strcpy(LOCAL_ErrorSay," in nlist(3) ");
return LOAD_FAILLED;
}
if (func_info[0].n_type == 0) {
strcpy(LOCAL_ErrorSay," in nlist(3) ");
return LOAD_FAILLED;
}
*init_proc = (YapInitProc)(func_info[0].n_value);
}
/* ok, we got our init point */
/* now read our text */
lseek(fildes, (long)(N_TXTOFF(header)), 0);
{
unsigned int u1 = header.a_text + header.a_data;
read(fildes, (char *) FCodeBase, u1);
/* zero the BSS segment */
while (u1 < loadImageSize)
FCodeBase[u1++] = 0;
}
close(fildes);
unlink(tfile);
return LOAD_SUCCEEDED;
}
Int
Yap_LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return LoadForeign(ofiles, libs, proc_name, init_proc);
}
void
Yap_ShutdownLoadForeign(void)
{
}
Int
Yap_ReLoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return(LoadForeign(ofiles,libs, proc_name, init_proc));
}
#endif