124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1998 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* The launcher for bytecode executables (if #! is not working) */
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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 "../config/s.h"
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#ifdef HAS_UNISTD
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "../byterun/exec.h"
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char * default_runtime_path = RUNTIME_NAME;
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#define MAXPATHLEN 1024
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#ifndef S_ISREG
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#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
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#endif
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#ifndef SEEK_END
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#define SEEK_END 2
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#endif
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static char * searchpath(char * name)
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{
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static char fullname[MAXPATHLEN + 1];
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char * path;
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char * p;
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char * q;
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struct stat st;
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for (p = name; *p != 0; p++) {
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if (*p == '/') return name;
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}
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path = getenv("PATH");
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if (path == NULL) return name;
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while(1) {
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for (p = fullname; *path != 0 && *path != ':'; p++, path++)
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if (p < fullname + MAXPATHLEN) *p = *path;
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if (p != fullname && p < fullname + MAXPATHLEN)
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*p++ = '/';
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for (q = name; *q != 0; p++, q++)
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if (p < fullname + MAXPATHLEN) *p = *q;
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*p = 0;
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if (stat(fullname, &st) == 0 && S_ISREG(st.st_mode)) break;
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if (*path == 0) return name;
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path++;
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}
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return fullname;
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}
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static unsigned long read_size(char * ptr)
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{
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unsigned char * p = (unsigned char *) ptr;
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return ((unsigned long) p[0] << 24) + ((unsigned long) p[1] << 16) +
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((unsigned long) p[2] << 8) + p[3];
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}
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static char * read_runtime_path(int fd)
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{
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char buffer[TRAILER_SIZE];
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static char runtime_path[MAXPATHLEN];
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unsigned path_size, code_size, prim_size, data_size;
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unsigned symbol_size, debug_size, size;
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lseek(fd, (long) -TRAILER_SIZE, SEEK_END);
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if (read(fd, buffer, TRAILER_SIZE) < TRAILER_SIZE) return NULL;
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path_size = read_size(buffer);
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code_size = read_size(buffer + 4);
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prim_size = read_size(buffer + 8);
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data_size = read_size(buffer + 12);
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symbol_size = read_size(buffer + 16);
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debug_size = read_size(buffer + 20);
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if (path_size > MAXPATHLEN) return NULL;
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if (path_size == 0) return default_runtime_path;
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size = path_size + code_size + prim_size +
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data_size + symbol_size + debug_size + TRAILER_SIZE;
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lseek(fd, -size, SEEK_END);
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if (read(fd, runtime_path, path_size) != path_size) return NULL;
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runtime_path[path_size - 1] = 0;
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return runtime_path;
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}
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static void errwrite(char * msg)
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{
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write(2, msg, strlen(msg));
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}
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int main(int argc, char ** argv)
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{
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char * truename, * runtime_path;
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int fd;
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truename = searchpath(argv[0]);
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fd = open(truename, O_RDONLY);
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if (fd == -1 || (runtime_path = read_runtime_path(fd)) == NULL) {
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errwrite(truename);
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errwrite(" not found or is not a bytecode executable file\n");
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return 2;
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}
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execv(runtime_path, argv);
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errwrite("Cannot exec ");
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errwrite(runtime_path);
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errwrite("\n");
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return 2;
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}
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