scoutos / prex-0.9.0 / usr / lib / posix / exec / execve.c @ 03e9c04a
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/*
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* Copyright (c) 2005-2006, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/prex.h> |
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#include <ipc/exec.h> |
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#include <ipc/ipc.h> |
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#include <unistd.h> |
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#include <limits.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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/*
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* Note:
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*
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* The state after exec() are as follows:
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* - Opened file descriptors remain open except FD_CLOEXEC flag is set.
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* - Opened directory streams are closed
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* - Signals set to the default action.
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* - Any asynchronous I/O operations are cancelled.
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*/
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int
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execve(const char *path, char * const *argv, char * const *envp) |
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{ |
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object_t execobj; |
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struct exec_msg msg;
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int error, i, argc, envc;
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size_t bufsz; |
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char *dest, *src;
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if ((error = object_lookup("!exec", &execobj)) != 0) |
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return ENOSYS;
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if (path == NULL) |
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return EFAULT;
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/*
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if (strlen(path) >= PATH_MAX)
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return ENAMETOOLONG;
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*/
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/* Get arg/env buffer size */
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bufsz = 0;
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argc = 0;
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if (argv) {
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while (argv[argc]) {
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bufsz += (strlen(argv[argc]) + 1);
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argc++; |
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} |
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} |
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envc = 0;
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if (envp) {
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while (envp[envc]) {
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bufsz += (strlen(envp[envc]) + 1);
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envc++; |
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} |
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} |
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if (bufsz >= ARG_MAX)
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return E2BIG;
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dest = msg.buf; |
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for (i = 0; i < argc; i++) { |
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src = argv[i]; |
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while ((*dest++ = *src++) != 0); |
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} |
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for (i = 0; i < envc; i++) { |
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src = envp[i]; |
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while ((*dest++ = *src++) != 0); |
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} |
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/* Request to exec server */
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msg.hdr.code = EXEC_EXECVE; |
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msg.argc = argc; |
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msg.envc = envc; |
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msg.bufsz = bufsz; |
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getcwd(msg.cwd, PATH_MAX); |
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strlcpy(msg.path, path, PATH_MAX); |
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do {
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error = msg_send(execobj, &msg, sizeof(msg));
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} while (error == EINTR);
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/*
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* If exec() request is done successfully, control never comes here.
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*/
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errno = 0;
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if (error)
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errno = EIO; |
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else if (msg.hdr.status) |
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errno = msg.hdr.status; |
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return -1; |
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} |