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/*
* Copyright (c) 2003 Gunnar Ritter
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute
* it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/
/* Sccsid @(#)ib_popen.c 1.2 (gritter) 4/17/03 */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <signal.h>
#include "iblok.h"
struct iblok *
ib_popen(const char *cmd, unsigned blksize)
{
struct iblok *ip;
int fd[2], err;
pid_t pid;
char *shell;
if (pipe(fd) < 0)
return NULL;
switch (pid = fork()) {
case -1:
return NULL;
case 0:
close(fd[0]);
dup2(fd[1], 1);
close(fd[1]);
if ((shell = getenv("SHELL")) == NULL)
shell = "/bin/sh";
execl(shell, shell, "-c", cmd, NULL);
_exit(0177);
/*NOTREACHED*/
}
close(fd[1]);
if ((ip = ib_alloc(fd[0], blksize)) == NULL) {
err = errno;
close(fd[0]);
errno = err;
}
ip->ib_pid = pid;
return ip;
}
int
ib_pclose(struct iblok *ip)
{
struct sigaction oldhup, oldint, oldquit, act;
int status;
close(ip->ib_fd);
act.sa_handler = SIG_IGN;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGHUP, &act, &oldhup);
sigaction(SIGINT, &act, &oldint);
sigaction(SIGQUIT, &act, &oldquit);
while (waitpid(ip->ib_pid, &status, 0) < 0 && errno == EINTR);
sigaction(SIGHUP, &oldhup, NULL);
sigaction(SIGINT, &oldint, NULL);
sigaction(SIGQUIT, &oldquit, NULL);
return status;
}
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