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Annotation of prex-old/usr/lib/posix/exec/execve.c, Revision 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:
        !           113:        errno = 0;
        !           114:        if (err)
        !           115:                errno = EIO;
        !           116:        else if (msg.hdr.status)
        !           117:                errno = msg.hdr.status;
        !           118:
        !           119:        return -1;
        !           120: }