Annotation of prex/usr/lib/posix/exec/execve.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 2005-2006, Kohsuke Ohtani
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: #include <prex/prex.h>
31: #include <server/exec.h>
32: #include <server/stdmsg.h>
33: #include <server/object.h>
34:
35: #include <limits.h>
36: #include <string.h>
37: #include <errno.h>
38: #include <stdlib.h>
39:
40: /*
41: * Note:
42: *
43: * The state after exec() are as follow.
44: * - Opened file descriptors remain open except FD_CLOEXEC flag is set.
45: * - Opened directory streams are closed
46: * - Signals set to the default action.
47: * - Any asynchronous I/O operations are cancelled.
48: */
49: int
50: execve(char *path, char *argv[], char *envp[])
51: {
52: object_t exec_obj;
53: struct exec_msg msg;
54: int err, i, argc, envc;
55: size_t bufsz;
56: char *dest, *src;
57:
58: if ((err = object_lookup(OBJNAME_EXEC, &exec_obj)) != 0)
59: return ENOSYS;
60:
61: if (path == NULL)
62: return EFAULT;
63: /*
64: if (strlen(path) >= PATH_MAX)
65: return ENAMETOOLONG;
66: */
67:
68: /* Get arg/env buffer size */
69: bufsz = 0;
70:
71: argc = 0;
72: if (argv) {
73: while (argv[argc]) {
74: bufsz += (strlen(argv[argc]) + 1);
75: argc++;
76: }
77: }
78: envc = 0;
79: if (envp) {
80: while (envp[envc]) {
81: bufsz += (strlen(envp[envc]) + 1);
82: envc++;
83: }
84: }
85: if (bufsz >= ARG_MAX)
86: return E2BIG;
87:
88: dest = msg.buf;
89: for (i = 0; i < argc; i++) {
90: src = argv[i];
91: while ((*dest++ = *src++) != 0);
92: }
93: for (i = 0; i < envc; i++) {
94: src = envp[i];
95: while ((*dest++ = *src++) != 0);
96: }
97:
98: /* Request to exec server */
99: msg.hdr.code = EX_EXEC;
100: msg.argc = argc;
101: msg.envc = envc;
102: msg.bufsz = bufsz;
103: strlcpy(msg.path, path, PATH_MAX);
104:
105: do {
106: err = msg_send(exec_obj, &msg, sizeof(msg));
107: } while (err == EINTR);
108:
109: /*
110: * If exec() request is done successfully, control never comes here.
111: */
112: errno = 0;
113: if (err)
114: errno = EIO;
115: else if (msg.hdr.status)
116: errno = msg.hdr.status;
117:
118: return -1;
119: }
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