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 #include <fcntl.h>
32 #include <sys/types.h>
33 #include <sys/wait.h>
34 #include <unistd.h>
35 #include <stdlib.h>
36 #include <stdio.h>
37 #include <libgen.h>
38 #include "global.h" /* pid_t, SIGTYPE, shell, and basename() */
39
40 #define tst(a, b) (*mode == 'r'? (b) : (a))
41 #define RDR 0
42 #define WTR 1
43
44 static pid_t popen_pid[20];
45 static SIGTYPE (*tstat)();
46
47 FILE *
mypopen(char * cmd,char * mode)48 mypopen(char *cmd, char *mode)
49 {
50 int p[2];
51 pid_t *poptr;
52 int myside, yourside;
53 pid_t pid;
54
55 if (pipe(p) < 0)
56 return (NULL);
57 myside = tst(p[WTR], p[RDR]);
58 yourside = tst(p[RDR], p[WTR]);
59 if ((pid = fork()) > 0) {
60 tstat = signal(SIGTSTP, SIG_DFL);
61 } else if (pid == 0) {
62 /* myside and yourside reverse roles in child */
63 int stdio;
64
65 /* close all pipes from other popen's */
66 for (poptr = popen_pid; poptr < popen_pid+20; poptr++) {
67 if (*poptr)
68 (void) close(poptr - popen_pid);
69 }
70 stdio = tst(0, 1);
71 (void) close(myside);
72 (void) close(stdio);
73 (void) fcntl(yourside, F_DUPFD, stdio);
74 (void) close(yourside);
75 (void) execlp(shell, basename(shell), "-c", cmd, 0);
76 _exit(1);
77 }
78 if (pid == -1)
79 return (NULL);
80 popen_pid[myside] = pid;
81 (void) close(yourside);
82 return (fdopen(myside, mode));
83 }
84
85 int
mypclose(FILE * ptr)86 mypclose(FILE *ptr)
87 {
88 int f;
89 pid_t r;
90 int status;
91 SIGTYPE (*hstat)(), (*istat)(), (*qstat)();
92
93 f = fileno(ptr);
94 (void) fclose(ptr);
95 istat = signal(SIGINT, SIG_IGN);
96 qstat = signal(SIGQUIT, SIG_IGN);
97 hstat = signal(SIGHUP, SIG_IGN);
98 while ((r = wait(&status)) != popen_pid[f] && r != -1) {
99 }
100 if (r == -1)
101 status = -1;
102 (void) signal(SIGINT, istat);
103 (void) signal(SIGQUIT, qstat);
104 (void) signal(SIGHUP, hstat);
105 (void) signal(SIGTSTP, tstat);
106 /* mark this pipe closed */
107 popen_pid[f] = 0;
108 return (status);
109 }
110