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