/*
* 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 (c) 1984, 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"
/*
* mailx -- a modified version of a University of California at Berkeley
* mail program
*
* npopen() and npclose()
*
* stolen from C library, modified to use SHELL variable
*/
#include <stdio.h>
#include <signal.h>
#include <fcntl.h>
#define tst(a,b) (*mode == 'r'? (b) : (a))
#define RDR 0
#define WTR 1
#ifdef VMUNIX
#define sigset signal
#else
extern void (*sigset())();
#endif
#ifdef preSVr4
extern FILE *fdopen();
extern int execlp(), fork(), pipe(), close(), fcntl();
#ifndef sun
typedef int pid_t;
#endif
#else
# include <unistd.h>
# include <wait.h>
#endif
static pid_t popen_pid[20];
FILE *
npopen(char *cmd, char *mode)
{
int p[2];
register pid_t pid;
register int myside, yourside;
char *Shell, *value(char *);
if ((Shell = value("SHELL")) == NULL || *Shell=='\0')
#ifdef preSVr4
Shell = "/bin/sh";
#else
Shell = "/usr/bin/sh";
#endif
if(pipe(p) < 0)
return(NULL);
myside = tst(p[WTR], p[RDR]);
yourside = tst(p[RDR], p[WTR]);
if((pid = fork()) == 0) {
/* myside and yourside reverse roles in child */
int stdio;
stdio = tst(0, 1);
(void) close(myside);
(void) close(stdio);
(void) fcntl(yourside, 0, stdio);
(void) close(yourside);
(void) execlp(Shell, Shell, "-c", cmd, (char *)0);
perror(Shell);
_exit(1);
}
if(pid == (pid_t)-1)
return(NULL);
popen_pid[myside] = pid;
(void) close(yourside);
return(fdopen(myside, mode));
}
int
npclose(FILE *ptr)
{
register int f;
register pid_t r;
int status;
void (*istat)(int), (*qstat)(int);
f = fileno(ptr);
(void) fclose(ptr);
istat = sigset(SIGINT, SIG_IGN);
qstat = sigset(SIGQUIT, SIG_IGN);
while((r = wait(&status)) != popen_pid[f] && r != (pid_t)-1)
;
if(r == (pid_t)-1)
status = -1;
(void) sigset(SIGINT, istat);
(void) sigset(SIGQUIT, qstat);
return(status);
}