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/*-
* Copyright (C) 2005 Max Okumoto.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY 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 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "proc.h"
#include "shell.h"
#include "util.h"
/**
* Replace the current process.
*/
void
Proc_Exec(const ProcStuff *ps)
{
if (ps->in != STDIN_FILENO) {
/*
* Redirect the child's stdin to the input fd
* and reset it to the beginning (again).
*/
if (dup2(ps->in, STDIN_FILENO) == -1)
Punt("Cannot dup2: %s", strerror(errno));
lseek(STDIN_FILENO, (off_t)0, SEEK_SET);
}
if (ps->out != STDOUT_FILENO) {
/*
* Redirect the child's stdout to the output fd.
*/
if (dup2(ps->out, STDOUT_FILENO) == -1)
Punt("Cannot dup2: %s", strerror(errno));
close(ps->out);
}
if (ps->err != STDERR_FILENO) {
/*
* Redirect the child's stderr to the err fd.
*/
if (dup2(ps->err, STDERR_FILENO) == -1)
Punt("Cannot dup2: %s", strerror(errno));
close(ps->err);
}
if (ps->merge_errors) {
/*
* Send stderr to parent process too.
*/
if (dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
Punt("Cannot dup2: %s", strerror(errno));
}
if (commandShell->unsetenv) {
/* for the benfit of ksh */
unsetenv("ENV");
}
/*
* The file descriptors for stdin, stdout, or stderr might
* have been marked close-on-exec. Clear the flag on all
* of them.
*/
fcntl(STDIN_FILENO, F_SETFD,
fcntl(STDIN_FILENO, F_GETFD) & (~FD_CLOEXEC));
fcntl(STDOUT_FILENO, F_SETFD,
fcntl(STDOUT_FILENO, F_GETFD) & (~FD_CLOEXEC));
fcntl(STDERR_FILENO, F_SETFD,
fcntl(STDERR_FILENO, F_GETFD) & (~FD_CLOEXEC));
if (ps->pgroup) {
#ifdef USE_PGRP
/*
* Become a process group leader, so we can kill it and all
* its descendants in one fell swoop, by killing its process
* family, but not commit suicide.
*/
#if defined(SYSV)
setsid();
#else
setpgid(0, getpid());
#endif
#endif /* USE_PGRP */
}
if (ps->searchpath) {
execvp(ps->argv[0], ps->argv);
write(STDERR_FILENO, ps->argv[0], strlen(ps->argv[0]));
write(STDERR_FILENO, ": ", 2);
write(STDERR_FILENO, strerror(errno), strlen(strerror(errno)));
write(STDERR_FILENO, "\n", 1);
} else {
execv(commandShell->path, ps->argv);
write(STDERR_FILENO,
"Could not execute shell\n",
sizeof("Could not execute shell"));
}
/*
* Since we are the child process, exit without flushing buffers.
*/
_exit(1);
}
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