File: [local] / prex-old / usr / lib / posix / exec / execve.c (download)
Revision 1.1.1.1.2.1, Wed Aug 13 16:12:39 2008 UTC (16 years ago) by nbrk
Branch: PREX_0_8_BASE
Changes since 1.1.1.1: +0 -1 lines
Prex 0.8.0 has been released. Branch off from vanilla PREX_0_7_BASE preparing
the tree for backporting my changes.
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/*
* Copyright (c) 2005-2006, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <prex/prex.h>
#include <server/exec.h>
#include <server/stdmsg.h>
#include <server/object.h>
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
/*
* Note:
*
* The state after exec() are as follow.
* - Opened file descriptors remain open except FD_CLOEXEC flag is set.
* - Opened directory streams are closed
* - Signals set to the default action.
* - Any asynchronous I/O operations are cancelled.
*/
int
execve(char *path, char *argv[], char *envp[])
{
object_t exec_obj;
struct exec_msg msg;
int err, i, argc, envc;
size_t bufsz;
char *dest, *src;
if ((err = object_lookup(OBJNAME_EXEC, &exec_obj)) != 0)
return ENOSYS;
if (path == NULL)
return EFAULT;
/*
if (strlen(path) >= PATH_MAX)
return ENAMETOOLONG;
*/
/* Get arg/env buffer size */
bufsz = 0;
argc = 0;
if (argv) {
while (argv[argc]) {
bufsz += (strlen(argv[argc]) + 1);
argc++;
}
}
envc = 0;
if (envp) {
while (envp[envc]) {
bufsz += (strlen(envp[envc]) + 1);
envc++;
}
}
if (bufsz >= ARG_MAX)
return E2BIG;
dest = msg.buf;
for (i = 0; i < argc; i++) {
src = argv[i];
while ((*dest++ = *src++) != 0);
}
for (i = 0; i < envc; i++) {
src = envp[i];
while ((*dest++ = *src++) != 0);
}
/* Request to exec server */
msg.hdr.code = EX_EXEC;
msg.argc = argc;
msg.envc = envc;
msg.bufsz = bufsz;
strlcpy(msg.path, path, PATH_MAX);
do {
err = msg_send(exec_obj, &msg, sizeof(msg));
} while (err == EINTR);
/*
* If exec() request is done successfully, control never comes here.
*/
errno = 0;
if (err)
errno = EIO;
else if (msg.hdr.status)
errno = msg.hdr.status;
return -1;
}