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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1998 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
/* The launcher for bytecode executables (if #! is not working) */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "caml/s.h"
#ifdef HAS_UNISTD
#include <unistd.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "caml/mlvalues.h"
#include "caml/exec.h"
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
#ifndef SEEK_END
#define SEEK_END 2
#endif
#ifndef __CYGWIN__
/* Normal Unix search path function */
static char * searchpath(char * name)
{
static char fullname[MAXPATHLEN + 1];
char * path;
struct stat st;
for (char *p = name; *p != 0; p++) {
if (*p == '/') return name;
}
path = getenv("PATH");
if (path == NULL) return name;
while(1) {
char * p;
for (p = fullname; *path != 0 && *path != ':'; p++, path++)
if (p < fullname + MAXPATHLEN) *p = *path;
if (p != fullname && p < fullname + MAXPATHLEN)
*p++ = '/';
for (char *q = name; *q != 0; p++, q++)
if (p < fullname + MAXPATHLEN) *p = *q;
*p = 0;
if (stat(fullname, &st) == 0 && S_ISREG(st.st_mode)) break;
if (*path == 0) return name;
path++;
}
return fullname;
}
#else
/* Special version for Cygwin32: takes care of the ".exe" implicit suffix */
static int file_ok(char * name)
{
int fd;
/* Cannot use stat() here because it adds ".exe" implicitly */
fd = open(name, O_RDONLY);
if (fd == -1) return 0;
close(fd);
return 1;
}
static char * searchpath(char * name)
{
char * path, * fullname;
path = getenv("PATH");
fullname = malloc(strlen(name) + (path == NULL ? 0 : strlen(path)) + 6);
/* 6 = "/" plus ".exe" plus final "\0" */
if (fullname == NULL) return name;
/* Check for absolute path name */
for (char *p = name; *p != 0; p++) {
if (*p == '/' || *p == '\\') {
if (file_ok(name)) return name;
strcpy(fullname, name);
strcat(fullname, ".exe");
if (file_ok(fullname)) return fullname;
return name;
}
}
/* Search in path */
if (path == NULL) return name;
while(1) {
char * p;
for (p = fullname; *path != 0 && *path != ':'; p++, path++) *p = *path;
if (p != fullname) *p++ = '/';
strcpy(p, name);
if (file_ok(fullname)) return fullname;
strcat(fullname, ".exe");
if (file_ok(fullname)) return fullname;
if (*path == 0) break;
path++;
}
return name;
}
#endif
static unsigned long read_size(char * ptr)
{
unsigned char * p = (unsigned char *) ptr;
return ((unsigned long) p[0] << 24) + ((unsigned long) p[1] << 16) +
((unsigned long) p[2] << 8) + p[3];
}
static char * read_runtime_path(int fd)
{
char buffer[TRAILER_SIZE];
static char runtime_path[MAXPATHLEN];
int num_sections;
uint32_t path_size;
long ofs;
lseek(fd, (long) -TRAILER_SIZE, SEEK_END);
if (read(fd, buffer, TRAILER_SIZE) < TRAILER_SIZE) return NULL;
num_sections = read_size(buffer);
ofs = TRAILER_SIZE + num_sections * 8;
lseek(fd, -ofs, SEEK_END);
path_size = 0;
for (int i = 0; i < num_sections; i++) {
if (read(fd, buffer, 8) < 8) return NULL;
if (buffer[0] == 'R' && buffer[1] == 'N' &&
buffer[2] == 'T' && buffer[3] == 'M') {
path_size = read_size(buffer + 4);
ofs += path_size;
} else if (path_size > 0)
ofs += read_size(buffer + 4);
}
if (path_size == 0) return NULL;
if (path_size >= MAXPATHLEN) return NULL;
lseek(fd, -ofs, SEEK_END);
if (read(fd, runtime_path, path_size) != path_size) return NULL;
return runtime_path;
}
static void errwrite(char * msg)
{
fputs(msg, stderr);
}
#ifndef O_BINARY
#define O_BINARY 0
#endif
int main(int argc, char ** argv)
{
char * truename, * runtime_path;
int fd;
truename = searchpath(argv[0]);
fd = open(truename, O_RDONLY | O_BINARY);
if (fd == -1 || (runtime_path = read_runtime_path(fd)) == NULL) {
errwrite(truename);
errwrite(" not found or is not a bytecode executable file\n");
return 2;
}
argv[0] = truename;
execv(runtime_path, argv);
errwrite("Cannot exec ");
errwrite(runtime_path);
errwrite("\n");
return 2;
}
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