1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/***********************************************************************/
/* */
/* 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 Library General Public License, with */
/* the special exception on linking described in file ../LICENSE. */
/* */
/***********************************************************************/
/* The launcher for bytecode executables (if #! is not working) */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../config/s.h"
#ifdef HAS_UNISTD
#include <unistd.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "../byterun/mlvalues.h"
#include "../byterun/exec.h"
char * default_runtime_path = RUNTIME_NAME;
#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 __CYGWIN32__
/* Normal Unix search path function */
static char * searchpath(char * name)
{
static char fullname[MAXPATHLEN + 1];
char * path;
char * p;
char * q;
struct stat st;
for (p = name; *p != 0; p++) {
if (*p == '/') return name;
}
path = getenv("PATH");
if (path == NULL) return name;
while(1) {
for (p = fullname; *path != 0 && *path != ':'; p++, path++)
if (p < fullname + MAXPATHLEN) *p = *path;
if (p != fullname && p < fullname + MAXPATHLEN)
*p++ = '/';
for (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, * p;
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 (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) {
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, i;
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 (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 default_runtime_path;
if (path_size >= MAXPATHLEN) return NULL;
lseek(fd, -ofs, SEEK_END);
if (read(fd, runtime_path, path_size) != path_size) return NULL;
runtime_path[path_size - 1] = 0;
return runtime_path;
}
static void errwrite(char * msg)
{
write(2, msg, strlen(msg));
}
#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;
}
|
