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 /*
31 * These routines are based on the standard UNIX stdio popen/pclose
32 * routines. This version takes an argv[][] argument instead of a string
33 * to be passed to the shell. The routine execvp() is used to call the
34 * program, hence the name popenvp() and the argument types.
35 *
36 * This routine avoids an extra shell completely, along with not having
37 * to worry about quoting conventions in strings that have spaces,
38 * quotes, etc.
39 */
40
41 #include <sys/types.h>
42 #include <assert.h>
43 #include <string.h>
44 #include "libmail.h"
45 #include <sys/wait.h>
46 #include <stdio.h>
47 #include <fcntl.h>
48 #include <signal.h>
49 #include <errno.h>
50
51 #define tst(a, b) (*mode == 'r'? (b) : (a))
52 #define RDR 0
53 #define WTR 1
54
55 #include <unistd.h>
56 static pid_t popen_pid[20];
57
58 /* Functions calling popenvp() should ensure 'file' is non-NULL */
59
60 FILE *
popenvp(char * file,char ** argv,char * mode,int resetid)61 popenvp(char *file, char **argv, char *mode, int resetid)
62 {
63 int p[2];
64 int myside, yourside;
65 pid_t pid;
66
67 assert(file != NULL);
68 if (pipe(p) < 0)
69 return (NULL);
70 myside = tst(p[WTR], p[RDR]);
71 yourside = tst(p[RDR], p[WTR]);
72 if ((pid = fork()) == 0) {
73 /* myside and yourside reverse roles in child */
74 int stdio;
75
76 if (resetid) {
77 (void) setgid(getgid());
78 (void) setuid(getuid());
79 }
80 stdio = tst(0, 1);
81 (void) close(myside);
82 (void) close(stdio);
83 (void) fcntl(yourside, F_DUPFD, stdio);
84 (void) close(yourside);
85 (void) execvp(file, argv);
86 (void) fprintf(stderr, "exec of \"%s\" failed: %s\n",
87 file, strerror(errno));
88 (void) fflush(stderr);
89 _exit(1);
90 }
91 if (pid == (pid_t)-1)
92 return (NULL);
93 popen_pid[myside] = pid;
94 (void) close(yourside);
95 return (fdopen(myside, mode));
96 }
97
98 int
pclosevp(FILE * ptr)99 pclosevp(FILE *ptr)
100 {
101 int f;
102 pid_t r;
103 int status;
104 void (*hstat)(int), (*istat)(int), (*qstat)(int);
105
106 f = fileno(ptr);
107 (void) fclose(ptr);
108 istat = signal(SIGINT, SIG_IGN);
109 qstat = signal(SIGQUIT, SIG_IGN);
110 hstat = signal(SIGHUP, SIG_IGN);
111 do {
112 r = wait(&status);
113 } while (r != popen_pid[f] && r != (pid_t)-1);
114
115 if (r == (pid_t)-1)
116 status = -1;
117 (void) signal(SIGINT, istat);
118 (void) signal(SIGQUIT, qstat);
119 (void) signal(SIGHUP, hstat);
120 return (status);
121 }
122