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Annotation of prex-old/usr/lib/posix/exec/execve.c, Revision 1.1.1.1.2.1

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: }