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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1996 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "ftp_var.h"
#ifndef sigmask
#define sigmask(m) (1 << ((m)-1))
#endif
#define set2mask(setp) ((setp)->__sigbits[0])
#define mask2set(mask, setp) \
((mask) == -1 ? sigfillset(setp) : (((setp)->__sigbits[0]) = (mask)))
static int
sigsetmask(int mask)
{
sigset_t oset;
sigset_t nset;
(void) sigprocmask(0, (sigset_t *)0, &nset);
mask2set(mask, &nset);
(void) sigprocmask(SIG_SETMASK, &nset, &oset);
return (set2mask(&oset));
}
static int
sigblock(int mask)
{
sigset_t oset;
sigset_t nset;
(void) sigprocmask(0, (sigset_t *)0, &nset);
mask2set(mask, &nset);
(void) sigprocmask(SIG_BLOCK, &nset, &oset);
return (set2mask(&oset));
}
#define signal(s, f) sigset(s, f)
#define tst(a, b) (*mode == 'r'? (b) : (a))
#define RDR 0
#define WTR 1
#define NOFILES 20 /* just in case */
static pid_t *popen_pid;
static rlim_t nfiles = 0;
FILE *
mypopen(char *cmd, char *mode)
{
int p[2];
pid_t pid;
int myside, remside, i;
struct rlimit rl;
if (nfiles <= 0) {
if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
nfiles = rl.rlim_max;
else
nfiles = NOFILES;
}
if (popen_pid == NULL) {
popen_pid = (pid_t *)malloc((unsigned)nfiles *
sizeof (*popen_pid));
if (popen_pid == NULL)
return (NULL);
for (i = 0; i < nfiles; i++)
popen_pid[i] = (pid_t)-1;
}
if (pipe(p) < 0)
return (NULL);
myside = tst(p[WTR], p[RDR]);
remside = tst(p[RDR], p[WTR]);
if ((pid = vfork()) == 0) {
/* myside and remside reverse roles in child */
(void) close(myside);
if (remside != tst(0, 1)) {
(void) dup2(remside, tst(0, 1));
(void) close(remside);
}
execl("/bin/sh", "sh", "-c", cmd, (char *)NULL);
_exit(127);
}
if (pid == (pid_t)-1) {
(void) close(myside);
(void) close(remside);
return (NULL);
}
popen_pid[myside] = pid;
(void) close(remside);
return (fdopen(myside, mode));
}
/*ARGSUSED*/
static void
pabort(int sig)
{
extern int mflag;
mflag = 0;
}
int
mypclose(FILE *ptr)
{
pid_t child, pid;
int omask;
void (*istat)();
int status;
child = popen_pid[fileno(ptr)];
popen_pid[fileno(ptr)] = (pid_t)-1;
(void) fclose(ptr);
if (child == (pid_t)-1)
return (-1);
istat = signal(SIGINT, pabort);
omask = sigblock(sigmask(SIGQUIT)|sigmask(SIGHUP));
while ((pid = wait(&status)) != child && pid != (pid_t)-1)
;
(void) sigsetmask(omask);
(void) signal(SIGINT, istat);
return (pid == (pid_t)-1 ? -1 : 0);
}
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