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 /*
23 * Copyright 1996 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40 #pragma ident "%Z%%M% %I% %E% SMI"
41
42 #include "ftp_var.h"
43
44 #ifndef sigmask
45 #define sigmask(m) (1 << ((m)-1))
46 #endif
47
48 #define set2mask(setp) ((setp)->__sigbits[0])
49 #define mask2set(mask, setp) \
50 ((mask) == -1 ? sigfillset(setp) : (((setp)->__sigbits[0]) = (mask)))
51
52
53 static int
sigsetmask(int mask)54 sigsetmask(int mask)
55 {
56 sigset_t oset;
57 sigset_t nset;
58
59 (void) sigprocmask(0, (sigset_t *)0, &nset);
60 mask2set(mask, &nset);
61 (void) sigprocmask(SIG_SETMASK, &nset, &oset);
62 return (set2mask(&oset));
63 }
64
65 static int
sigblock(int mask)66 sigblock(int mask)
67 {
68 sigset_t oset;
69 sigset_t nset;
70
71 (void) sigprocmask(0, (sigset_t *)0, &nset);
72 mask2set(mask, &nset);
73 (void) sigprocmask(SIG_BLOCK, &nset, &oset);
74 return (set2mask(&oset));
75 }
76
77 #define signal(s, f) sigset(s, f)
78
79 #define tst(a, b) (*mode == 'r'? (b) : (a))
80 #define RDR 0
81 #define WTR 1
82 #define NOFILES 20 /* just in case */
83
84 static pid_t *popen_pid;
85 static rlim_t nfiles = 0;
86
87 FILE *
mypopen(char * cmd,char * mode)88 mypopen(char *cmd, char *mode)
89 {
90 int p[2];
91 pid_t pid;
92 int myside, remside, i;
93 struct rlimit rl;
94
95 if (nfiles <= 0) {
96 if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
97 nfiles = rl.rlim_max;
98 else
99 nfiles = NOFILES;
100 }
101 if (popen_pid == NULL) {
102 popen_pid = (pid_t *)malloc((unsigned)nfiles *
103 sizeof (*popen_pid));
104 if (popen_pid == NULL)
105 return (NULL);
106 for (i = 0; i < nfiles; i++)
107 popen_pid[i] = (pid_t)-1;
108 }
109 if (pipe(p) < 0)
110 return (NULL);
111 myside = tst(p[WTR], p[RDR]);
112 remside = tst(p[RDR], p[WTR]);
113 if ((pid = vfork()) == 0) {
114 /* myside and remside reverse roles in child */
115 (void) close(myside);
116 if (remside != tst(0, 1)) {
117 (void) dup2(remside, tst(0, 1));
118 (void) close(remside);
119 }
120 execl("/bin/sh", "sh", "-c", cmd, (char *)NULL);
121 _exit(127);
122 }
123 if (pid == (pid_t)-1) {
124 (void) close(myside);
125 (void) close(remside);
126 return (NULL);
127 }
128 popen_pid[myside] = pid;
129 (void) close(remside);
130 return (fdopen(myside, mode));
131 }
132
133 /*ARGSUSED*/
134 static void
pabort(int sig)135 pabort(int sig)
136 {
137 extern int mflag;
138
139 mflag = 0;
140 }
141
142 int
mypclose(FILE * ptr)143 mypclose(FILE *ptr)
144 {
145 pid_t child, pid;
146 int omask;
147 void (*istat)();
148 int status;
149
150 child = popen_pid[fileno(ptr)];
151 popen_pid[fileno(ptr)] = (pid_t)-1;
152 (void) fclose(ptr);
153 if (child == (pid_t)-1)
154 return (-1);
155 istat = signal(SIGINT, pabort);
156 omask = sigblock(sigmask(SIGQUIT)|sigmask(SIGHUP));
157 while ((pid = wait(&status)) != child && pid != (pid_t)-1)
158 ;
159 (void) sigsetmask(omask);
160 (void) signal(SIGINT, istat);
161 return (pid == (pid_t)-1 ? -1 : 0);
162 }
163