Statistics
| Branch: | Revision:

scoutos / prex-0.9.0 / usr / lib / posix / exec / execve.c @ 03e9c04a

History | View | Annotate | Download (3.19 KB)

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 <sys/prex.h>
31
#include <ipc/exec.h>
32
#include <ipc/ipc.h>
33

    
34
#include <unistd.h>
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 follows:
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(const char *path, char * const *argv, char * const *envp)
51
{
52
        object_t execobj;
53
        struct exec_msg msg;
54
        int error, i, argc, envc;
55
        size_t bufsz;
56
        char *dest, *src;
57

    
58
        if ((error = object_lookup("!exec", &execobj)) != 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
        argc = 0;
71
        if (argv) {
72
                while (argv[argc]) {
73
                        bufsz += (strlen(argv[argc]) + 1);
74
                        argc++;
75
                }
76
        }
77
        envc = 0;
78
        if (envp) {
79
                while (envp[envc]) {
80
                        bufsz += (strlen(envp[envc]) + 1);
81
                        envc++;
82
                }
83
        }
84
        if (bufsz >= ARG_MAX)
85
                return E2BIG;
86

    
87
        dest = msg.buf;
88
        for (i = 0; i < argc; i++) {
89
                src = argv[i];
90
                while ((*dest++ = *src++) != 0);
91
        }
92
        for (i = 0; i < envc; i++) {
93
                src = envp[i];
94
                while ((*dest++ = *src++) != 0);
95
        }
96

    
97
        /* Request to exec server */
98
        msg.hdr.code = EXEC_EXECVE;
99
        msg.argc = argc;
100
        msg.envc = envc;
101
        msg.bufsz = bufsz;
102
        getcwd(msg.cwd, PATH_MAX);
103
        strlcpy(msg.path, path, PATH_MAX);
104
        do {
105
                error = msg_send(execobj, &msg, sizeof(msg));
106
        } while (error == EINTR);
107

    
108
        /*
109
         * If exec() request is done successfully, control never comes here.
110
         */
111
        errno = 0;
112
        if (error)
113
                errno = EIO;
114
        else if (msg.hdr.status)
115
                errno = msg.hdr.status;
116

    
117
        return -1;
118
}