root / prex-0.9.0 / usr / lib / posix / exec / execve.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005-2006, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/prex.h> |
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31 | #include <ipc/exec.h> |
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32 | #include <ipc/ipc.h> |
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33 | |||
34 | #include <unistd.h> |
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35 | #include <limits.h> |
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36 | #include <string.h> |
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37 | #include <errno.h> |
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38 | #include <stdlib.h> |
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39 | |||
40 | /*
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41 | * Note:
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42 | *
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43 | * The state after exec() are as follows:
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44 | * - Opened file descriptors remain open except FD_CLOEXEC flag is set.
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45 | * - Opened directory streams are closed
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46 | * - Signals set to the default action.
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47 | * - Any asynchronous I/O operations are cancelled.
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48 | */
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49 | int
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50 | execve(const char *path, char * const *argv, char * const *envp) |
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51 | { |
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52 | object_t execobj; |
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53 | struct exec_msg msg;
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54 | int error, i, argc, envc;
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55 | size_t bufsz; |
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56 | char *dest, *src;
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57 | |||
58 | if ((error = object_lookup("!exec", &execobj)) != 0) |
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59 | return ENOSYS;
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60 | |||
61 | if (path == NULL) |
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62 | return EFAULT;
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63 | /*
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64 | if (strlen(path) >= PATH_MAX)
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65 | return ENAMETOOLONG;
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66 | */
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67 | |||
68 | /* Get arg/env buffer size */
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69 | bufsz = 0;
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70 | argc = 0;
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71 | if (argv) {
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72 | while (argv[argc]) {
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73 | bufsz += (strlen(argv[argc]) + 1);
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74 | argc++; |
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75 | } |
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76 | } |
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77 | envc = 0;
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78 | if (envp) {
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79 | while (envp[envc]) {
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80 | bufsz += (strlen(envp[envc]) + 1);
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81 | envc++; |
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82 | } |
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83 | } |
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84 | if (bufsz >= ARG_MAX)
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85 | return E2BIG;
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86 | |||
87 | dest = msg.buf; |
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88 | for (i = 0; i < argc; i++) { |
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89 | src = argv[i]; |
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90 | while ((*dest++ = *src++) != 0); |
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91 | } |
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92 | for (i = 0; i < envc; i++) { |
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93 | src = envp[i]; |
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94 | while ((*dest++ = *src++) != 0); |
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95 | } |
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96 | |||
97 | /* Request to exec server */
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98 | msg.hdr.code = EXEC_EXECVE; |
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99 | msg.argc = argc; |
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100 | msg.envc = envc; |
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101 | msg.bufsz = bufsz; |
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102 | getcwd(msg.cwd, PATH_MAX); |
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103 | strlcpy(msg.path, path, PATH_MAX); |
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104 | do {
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105 | error = msg_send(execobj, &msg, sizeof(msg));
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106 | } while (error == EINTR);
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107 | |||
108 | /*
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109 | * If exec() request is done successfully, control never comes here.
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110 | */
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111 | errno = 0;
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112 | if (error)
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113 | errno = EIO; |
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114 | else if (msg.hdr.status) |
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115 | errno = msg.hdr.status; |
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116 | |||
117 | return -1; |
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118 | } |