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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 /*
33 * These routines are based on the standard UNIX stdio popen/pclose
34 * routines. This version takes an argv[][] argument instead of a string
35 * to be passed to the shell. The routine execvp() is used to call the
36 * program, hence the name popenvp() and the argument types.
37 *
38 * This routine avoids an extra shell completely, along with not having
39 * to worry about quoting conventions in strings that have spaces,
40 * quotes, etc.
41 */
42
43 #include <sys/types.h>
44 #include <assert.h>
45 #include <string.h>
46 #include "libmail.h"
47 #include <sys/wait.h>
48 #include <stdio.h>
49 #include <fcntl.h>
50 #include <signal.h>
51 #include <errno.h>
52
53 #define tst(a, b) (*mode == 'r'? (b) : (a))
54 #define RDR 0
55 #define WTR 1
56
57 #include <unistd.h>
58 static pid_t popen_pid[20];
59
60 /* Functions calling popenvp() should ensure 'file' is non-NULL */
61
62 FILE *
popenvp(char * file,char ** argv,char * mode,int resetid)63 popenvp(char *file, char **argv, char *mode, int resetid)
64 {
65 int p[2];
66 int myside, yourside;
67 pid_t pid;
68
69 assert(file != NULL);
70 if (pipe(p) < 0)
71 return (NULL);
72 myside = tst(p[WTR], p[RDR]);
73 yourside = tst(p[RDR], p[WTR]);
74 if ((pid = fork()) == 0) {
75 /* myside and yourside reverse roles in child */
76 int stdio;
77
78 if (resetid) {
79 (void) setgid(getgid());
80 (void) setuid(getuid());
81 }
82 stdio = tst(0, 1);
83 (void) close(myside);
84 (void) close(stdio);
85 (void) fcntl(yourside, F_DUPFD, stdio);
86 (void) close(yourside);
87 (void) execvp(file, argv);
88 (void) fprintf(stderr, "exec of \"%s\" failed: %s\n",
89 file, strerror(errno));
90 (void) fflush(stderr);
91 _exit(1);
92 }
93 if (pid == (pid_t)-1)
94 return (NULL);
95 popen_pid[myside] = pid;
96 (void) close(yourside);
97 return (fdopen(myside, mode));
98 }
99
100 int
pclosevp(FILE * ptr)101 pclosevp(FILE *ptr)
102 {
103 int f;
104 pid_t r;
105 int status;
106 void (*hstat)(int), (*istat)(int), (*qstat)(int);
107
108 f = fileno(ptr);
109 (void) fclose(ptr);
110 istat = signal(SIGINT, SIG_IGN);
111 qstat = signal(SIGQUIT, SIG_IGN);
112 hstat = signal(SIGHUP, SIG_IGN);
113 do {
114 r = wait(&status);
115 } while (r != popen_pid[f] && r != (pid_t)-1);
116
117 if (r == (pid_t)-1)
118 status = -1;
119 (void) signal(SIGINT, istat);
120 (void) signal(SIGQUIT, qstat);
121 (void) signal(SIGHUP, hstat);
122 return (status);
123 }
124