1 /* Test of posix_spawn() function: reading from a subprocess.
2 Copyright (C) 2008-2023 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Written by Bruno Haible <bruno@clisp.org>, 2008. */
18
19 #include <config.h>
20
21 #include <spawn.h>
22
23 #include "signature.h"
24 SIGNATURE_CHECK (posix_spawnp, int, (pid_t *, char const *,
25 posix_spawn_file_actions_t const *,
26 posix_spawnattr_t const *,
27 char *const[], char *const[]));
28 SIGNATURE_CHECK (posix_spawnattr_init, int, (posix_spawnattr_t *));
29 SIGNATURE_CHECK (posix_spawnattr_destroy, int, (posix_spawnattr_t *));
30 SIGNATURE_CHECK (posix_spawnattr_setsigmask, int, (posix_spawnattr_t *,
31 sigset_t const *));
32 SIGNATURE_CHECK (posix_spawnattr_setflags, int, (posix_spawnattr_t *, short));
33 SIGNATURE_CHECK (posix_spawn_file_actions_init, int,
34 (posix_spawn_file_actions_t *));
35 SIGNATURE_CHECK (posix_spawn_file_actions_destroy, int,
36 (posix_spawn_file_actions_t *));
37 SIGNATURE_CHECK (posix_spawn_file_actions_addclose, int,
38 (posix_spawn_file_actions_t *, int));
39 SIGNATURE_CHECK (posix_spawn_file_actions_addopen, int,
40 (posix_spawn_file_actions_t *, int, char const *, int,
41 mode_t));
42 SIGNATURE_CHECK (posix_spawn_file_actions_adddup2, int,
43 (posix_spawn_file_actions_t *, int, int));
44
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <signal.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <sys/types.h>
53 #include <sys/wait.h>
54
55 #define CHILD_PROGRAM_FILENAME "test-posix_spawn-dup2-stdout.sh"
56
57 static int
58 fd_safer (int fd)
59 {
60 if (0 <= fd && fd <= 2)
61 {
62 int f = fd_safer (dup (fd));
63 int e = errno;
64 close (fd);
65 errno = e;
66 fd = f;
67 }
68
69 return fd;
70 }
71
72 int
73 main ()
74 {
75 char *argv[3] = { (char *) BOURNE_SHELL, (char *) CHILD_PROGRAM_FILENAME, NULL };
76 int ifd[2];
77 sigset_t blocked_signals;
78 sigset_t fatal_signal_set;
79 posix_spawn_file_actions_t actions;
80 bool actions_allocated;
81 posix_spawnattr_t attrs;
82 bool attrs_allocated;
83 int err;
84 pid_t child;
85 int fd;
86 FILE *fp;
87 char line[80];
88 int status;
89 int exitstatus;
90
91 if (pipe (ifd) < 0 || (ifd[0] = fd_safer (ifd[0])) < 0)
92 {
93 perror ("cannot create pipe");
94 exit (1);
95 }
96 sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
97 sigemptyset (&fatal_signal_set);
98 sigaddset (&fatal_signal_set, SIGINT);
99 sigaddset (&fatal_signal_set, SIGTERM);
100 #ifdef SIGHUP
101 sigaddset (&fatal_signal_set, SIGHUP);
102 #endif
103 #ifdef SIGPIPE
104 sigaddset (&fatal_signal_set, SIGPIPE);
105 #endif
106 sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
107 actions_allocated = false;
108 attrs_allocated = false;
109 if ((err = posix_spawn_file_actions_init (&actions)) != 0
110 || (actions_allocated = true,
111 (err = posix_spawn_file_actions_adddup2 (&actions, ifd[1], STDOUT_FILENO)) != 0
112 || (err = posix_spawn_file_actions_addclose (&actions, ifd[1])) != 0
113 || (err = posix_spawn_file_actions_addclose (&actions, ifd[0])) != 0
114 || (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, "/dev/null", O_RDONLY, 0)) != 0
115 || (err = posix_spawnattr_init (&attrs)) != 0
116 || (attrs_allocated = true,
117 #if defined _WIN32 && !defined __CYGWIN__
118 0
119 #else
120 (err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
121 || (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0
122 #endif
123 )
124 || (err = posix_spawnp (&child, BOURNE_SHELL, &actions, &attrs, argv, environ)) != 0))
125 {
126 if (actions_allocated)
127 posix_spawn_file_actions_destroy (&actions);
128 if (attrs_allocated)
129 posix_spawnattr_destroy (&attrs);
130 sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
131 errno = err;
132 perror ("subprocess failed");
133 exit (1);
134 }
135 posix_spawn_file_actions_destroy (&actions);
136 posix_spawnattr_destroy (&attrs);
137 sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
138 close (ifd[1]);
139 fd = ifd[0];
140 fp = fdopen (fd, "r");
141 if (fp == NULL)
142 {
143 fprintf (stderr, "fdopen() failed\n");
144 exit (1);
145 }
146 if (fread (line, 1, 80, fp) < 12)
147 {
148 fprintf (stderr, "could not read expected output\n");
149 exit (1);
150 }
151 if (memcmp (line, "Halle Potta", 11) != 0)
152 {
153 fprintf (stderr, "read output is not the expected output\n");
154 exit (1);
155 }
156 fclose (fp);
157 status = 0;
158 while (waitpid (child, &status, 0) != child)
159 ;
160 if (!WIFEXITED (status))
161 {
162 fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
163 exit (1);
164 }
165 exitstatus = WEXITSTATUS (status);
166 if (exitstatus != 0)
167 {
168 fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
169 exit (1);
170 }
171 return 0;
172 }