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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*	Copyright (c) 1988 AT&T	*/
     23 /*	  All Rights Reserved  	*/
     24 
     25 
     26 /*
     27  * Copyright (c) 1999 by Sun Microsystems, Inc.
     28  * All rights reserved.
     29  */
     30 
     31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     32 
     33 #include <fcntl.h>
     34 #include <sys/types.h>
     35 #include <sys/wait.h>
     36 #include <unistd.h>
     37 #include <stdlib.h>
     38 #include <stdio.h>
     39 #include <libgen.h>
     40 #include "global.h"	/* pid_t, SIGTYPE, shell, and basename() */
     41 
     42 #define	tst(a, b) (*mode == 'r'? (b) : (a))
     43 #define	RDR	0
     44 #define	WTR	1
     45 
     46 static pid_t popen_pid[20];
     47 static SIGTYPE (*tstat)();
     48 
     49 FILE *
     50 mypopen(char *cmd, char *mode)
     51 {
     52 	int	p[2];
     53 	pid_t *poptr;
     54 	int myside, yourside;
     55 	pid_t pid;
     56 
     57 	if (pipe(p) < 0)
     58 		return (NULL);
     59 	myside = tst(p[WTR], p[RDR]);
     60 	yourside = tst(p[RDR], p[WTR]);
     61 	if ((pid = fork()) > 0) {
     62 		tstat = signal(SIGTSTP, SIG_DFL);
     63 	} else if (pid == 0) {
     64 		/* myside and yourside reverse roles in child */
     65 		int	stdio;
     66 
     67 		/* close all pipes from other popen's */
     68 		for (poptr = popen_pid; poptr < popen_pid+20; poptr++) {
     69 			if (*poptr)
     70 				(void) close(poptr - popen_pid);
     71 		}
     72 		stdio = tst(0, 1);
     73 		(void) close(myside);
     74 		(void) close(stdio);
     75 		(void) fcntl(yourside, F_DUPFD, stdio);
     76 		(void) close(yourside);
     77 		(void) execlp(shell, basename(shell), "-c", cmd, 0);
     78 		_exit(1);
     79 	}
     80 	if (pid == -1)
     81 		return (NULL);
     82 	popen_pid[myside] = pid;
     83 	(void) close(yourside);
     84 	return (fdopen(myside, mode));
     85 }
     86 
     87 int
     88 mypclose(FILE *ptr)
     89 {
     90 	int f;
     91 	pid_t r;
     92 	int status;
     93 	SIGTYPE (*hstat)(), (*istat)(), (*qstat)();
     94 
     95 	f = fileno(ptr);
     96 	(void) fclose(ptr);
     97 	istat = signal(SIGINT, SIG_IGN);
     98 	qstat = signal(SIGQUIT, SIG_IGN);
     99 	hstat = signal(SIGHUP, SIG_IGN);
    100 	while ((r = wait(&status)) != popen_pid[f] && r != -1) {
    101 	}
    102 	if (r == -1)
    103 		status = -1;
    104 	(void) signal(SIGINT, istat);
    105 	(void) signal(SIGQUIT, qstat);
    106 	(void) signal(SIGHUP, hstat);
    107 	(void) signal(SIGTSTP, tstat);
    108 	/* mark this pipe closed */
    109 	popen_pid[f] = 0;
    110 	return (status);
    111 }
    112