Commit | Line | Data |
---|---|---|
b8f253e8 | 1 | /* |
74155b62 KB |
2 | * Copyright (c) 1988, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
633d7ef6 | 4 | * |
07329fc6 KB |
5 | * This code is derived from software written by Ken Arnold and |
6 | * published in UNIX Review, Vol. 6, No. 8. | |
633d7ef6 | 7 | * |
ad787160 C |
8 | * Redistribution and use in source and binary forms, with or without |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
b8f253e8 KM |
35 | */ |
36 | ||
2ce81398 | 37 | #if defined(LIBC_SCCS) && !defined(lint) |
fd88f5c5 | 38 | static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 5/3/95"; |
633d7ef6 | 39 | #endif /* LIBC_SCCS and not lint */ |
99756664 | 40 | |
07329fc6 | 41 | #include <sys/param.h> |
07329fc6 | 42 | #include <sys/wait.h> |
31c89b16 | 43 | #include <sys/socket.h> |
da25ab02 KB |
44 | |
45 | #include <signal.h> | |
34e174ed | 46 | #include <errno.h> |
da25ab02 | 47 | #include <unistd.h> |
01a56307 | 48 | #include <stdio.h> |
c5980113 DS |
49 | #include <stdlib.h> |
50 | #include <string.h> | |
24de0d84 | 51 | #include <paths.h> |
99756664 | 52 | |
da25ab02 KB |
53 | static struct pid { |
54 | struct pid *next; | |
55 | FILE *fp; | |
56 | pid_t pid; | |
57 | } *pidlist; | |
58 | ||
01a56307 | 59 | FILE * |
6b6b0257 KB |
60 | popen(command, type) |
61 | const char *command, *type; | |
01a56307 | 62 | { |
da25ab02 | 63 | struct pid *cur; |
633d7ef6 | 64 | FILE *iop; |
31c89b16 | 65 | int pdes[2], pid, twoway; |
07329fc6 | 66 | |
31c89b16 KM |
67 | if (strchr(type, '+')) { |
68 | twoway = 1; | |
69 | type = "r+"; | |
70 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pdes) < 0) | |
71 | return (NULL); | |
72 | } else { | |
73 | twoway = 0; | |
74 | if (*type != 'r' && *type != 'w' || type[1] || | |
75 | (pipe(pdes) < 0)) | |
76 | return (NULL); | |
6b6b0257 | 77 | } |
01a56307 | 78 | |
da25ab02 KB |
79 | if ((cur = malloc(sizeof(struct pid))) == NULL) |
80 | return (NULL); | |
81 | ||
06a6638d | 82 | switch (pid = vfork()) { |
da25ab02 KB |
83 | case -1: /* Error. */ |
84 | (void)close(pdes[0]); | |
85 | (void)close(pdes[1]); | |
86 | (void)free(cur); | |
900e9a44 | 87 | return (NULL); |
633d7ef6 | 88 | /* NOTREACHED */ |
da25ab02 | 89 | case 0: /* Child. */ |
633d7ef6 | 90 | if (*type == 'r') { |
cfbb84de | 91 | if (pdes[1] != STDOUT_FILENO) { |
da25ab02 KB |
92 | (void)dup2(pdes[1], STDOUT_FILENO); |
93 | (void)close(pdes[1]); | |
31c89b16 | 94 | pdes[1] = STDOUT_FILENO; |
07329fc6 | 95 | } |
900e9a44 | 96 | (void) close(pdes[0]); |
31c89b16 KM |
97 | if (twoway && (pdes[1] != STDIN_FILENO)) |
98 | (void)dup2(pdes[1], STDIN_FILENO); | |
633d7ef6 | 99 | } else { |
cfbb84de | 100 | if (pdes[0] != STDIN_FILENO) { |
da25ab02 KB |
101 | (void)dup2(pdes[0], STDIN_FILENO); |
102 | (void)close(pdes[0]); | |
07329fc6 | 103 | } |
da25ab02 | 104 | (void)close(pdes[1]); |
482b978e | 105 | } |
6b6b0257 | 106 | execl(_PATH_BSHELL, "sh", "-c", command, NULL); |
07329fc6 KB |
107 | _exit(127); |
108 | /* NOTREACHED */ | |
01a56307 | 109 | } |
da25ab02 KB |
110 | |
111 | /* Parent; assume fdopen can't fail. */ | |
07329fc6 KB |
112 | if (*type == 'r') { |
113 | iop = fdopen(pdes[0], type); | |
da25ab02 | 114 | (void)close(pdes[1]); |
07329fc6 KB |
115 | } else { |
116 | iop = fdopen(pdes[1], type); | |
da25ab02 | 117 | (void)close(pdes[0]); |
2337e291 | 118 | } |
da25ab02 KB |
119 | |
120 | /* Link into list of file descriptors. */ | |
121 | cur->fp = iop; | |
122 | cur->pid = pid; | |
123 | cur->next = pidlist; | |
124 | pidlist = cur; | |
125 | ||
900e9a44 | 126 | return (iop); |
01a56307 BJ |
127 | } |
128 | ||
da25ab02 KB |
129 | /* |
130 | * pclose -- | |
131 | * Pclose returns -1 if stream is not associated with a `popened' command, | |
132 | * if already `pclosed', or waitpid returns an error. | |
133 | */ | |
c5980113 | 134 | int |
633d7ef6 | 135 | pclose(iop) |
07329fc6 | 136 | FILE *iop; |
01a56307 | 137 | { |
da25ab02 | 138 | register struct pid *cur, *last; |
06a6638d | 139 | int omask; |
6b6b0257 | 140 | int pstat; |
c5980113 | 141 | pid_t pid; |
01a56307 | 142 | |
da25ab02 KB |
143 | /* Find the appropriate file pointer. */ |
144 | for (last = NULL, cur = pidlist; cur; last = cur, cur = cur->next) | |
145 | if (cur->fp == iop) | |
146 | break; | |
147 | if (cur == NULL) | |
900e9a44 | 148 | return (-1); |
da25ab02 | 149 | |
6b6b0257 KB |
150 | (void)fclose(iop); |
151 | ||
34e174ed | 152 | do { |
6b6b0257 | 153 | pid = waitpid(cur->pid, &pstat, 0); |
34e174ed | 154 | } while (pid == -1 && errno == EINTR); |
da25ab02 KB |
155 | |
156 | /* Remove the entry from the linked list. */ | |
157 | if (last == NULL) | |
158 | pidlist = cur->next; | |
159 | else | |
160 | last->next = cur->next; | |
161 | free(cur); | |
162 | ||
6b6b0257 | 163 | return (pid == -1 ? -1 : pstat); |
01a56307 | 164 | } |