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706e6749 | 1 | /* Check if posix_spawn does not act as a cancellation entrypoint. |
04277e02 | 2 | Copyright (C) 2016-2019 Free Software Foundation, Inc. |
706e6749 AZ |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <paths.h> | |
21 | #include <pthread.h> | |
22 | #include <signal.h> | |
23 | #include <spawn.h> | |
24 | #include <stdbool.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <unistd.h> | |
28 | #include <sys/wait.h> | |
29 | ||
30 | static int do_test (void); | |
31 | #define TEST_FUNCTION do_test () | |
32 | #include <test-skeleton.c> | |
33 | ||
34 | static pthread_barrier_t b; | |
35 | ||
36 | static pid_t pid; | |
37 | static int pipefd[2]; | |
38 | ||
39 | static void * | |
40 | tf (void *arg) | |
41 | { | |
42 | xpthread_barrier_wait (&b); | |
43 | ||
44 | posix_spawn_file_actions_t a; | |
45 | if (posix_spawn_file_actions_init (&a) != 0) | |
46 | { | |
47 | puts ("error: spawn_file_actions_init failed"); | |
48 | exit (1); | |
49 | } | |
50 | ||
51 | if (posix_spawn_file_actions_adddup2 (&a, pipefd[1], STDOUT_FILENO) != 0) | |
52 | { | |
53 | puts ("error: spawn_file_actions_adddup2 failed"); | |
54 | exit (1); | |
55 | } | |
56 | ||
57 | if (posix_spawn_file_actions_addclose (&a, pipefd[0]) != 0) | |
58 | { | |
59 | puts ("error: spawn_file_actions_addclose"); | |
60 | exit (1); | |
61 | } | |
62 | ||
63 | char *argv[] = { (char *) _PATH_BSHELL, (char *) "-c", (char *) "echo $$", | |
64 | NULL }; | |
65 | if (posix_spawn (&pid, _PATH_BSHELL, &a, NULL, argv, NULL) != 0) | |
66 | { | |
67 | puts ("error: spawn failed"); | |
68 | exit (1); | |
69 | } | |
70 | ||
71 | return NULL; | |
72 | } | |
73 | ||
74 | ||
75 | static int | |
76 | do_test (void) | |
77 | { | |
78 | /* The test basically pipe a 'echo $$' created by a thread with a | |
79 | cancellation pending. It then checks if the thread is not cancelled, | |
80 | the process is created and if the output is the expected one. */ | |
81 | ||
82 | if (pipe (pipefd) != 0) | |
83 | { | |
84 | puts ("error: pipe failed"); | |
85 | exit (1); | |
86 | } | |
87 | ||
88 | /* Not interested in knowing when the pipe is closed. */ | |
89 | if (sigignore (SIGPIPE) != 0) | |
90 | { | |
91 | puts ("error: sigignore failed"); | |
92 | exit (1); | |
93 | } | |
94 | ||
95 | /* To synchronize with the thread. */ | |
96 | if (pthread_barrier_init (&b, NULL, 2) != 0) | |
97 | { | |
98 | puts ("error: pthread_barrier_init failed"); | |
99 | exit (1); | |
100 | } | |
101 | ||
102 | pthread_t th = xpthread_create (NULL, &tf, NULL); | |
103 | ||
104 | if (pthread_cancel (th) != 0) | |
105 | { | |
106 | puts ("error: pthread_cancel failed"); | |
107 | return 1; | |
108 | } | |
109 | ||
110 | xpthread_barrier_wait (&b); | |
111 | ||
112 | if (xpthread_join (th) == PTHREAD_CANCELED) | |
113 | { | |
114 | puts ("error: thread cancelled"); | |
115 | exit (1); | |
116 | } | |
117 | ||
118 | close (pipefd[1]); | |
119 | ||
120 | /* The global 'pid' should be set by thread posix_spawn calling. Check | |
121 | below if it was executed correctly and with expected output. */ | |
122 | ||
123 | char buf[64]; | |
124 | ssize_t n; | |
125 | bool seen_pid = false; | |
126 | while (TEMP_FAILURE_RETRY ((n = read (pipefd[0], buf, sizeof (buf)))) > 0) | |
127 | { | |
128 | /* We only expect to read the PID. */ | |
129 | char *endp; | |
130 | long int rpid = strtol (buf, &endp, 10); | |
131 | ||
132 | if (*endp != '\n') | |
133 | { | |
134 | printf ("error: didn't parse whole line: \"%s\"\n", buf); | |
135 | exit (1); | |
136 | } | |
137 | if (endp == buf) | |
138 | { | |
139 | puts ("error: read empty line"); | |
140 | exit (1); | |
141 | } | |
142 | ||
143 | if (rpid != pid) | |
144 | { | |
145 | printf ("error: found \"%s\", expected PID %ld\n", buf, | |
146 | (long int) pid); | |
147 | exit (1); | |
148 | } | |
149 | ||
150 | if (seen_pid) | |
151 | { | |
152 | puts ("error: found more than one PID line"); | |
153 | exit (1); | |
154 | } | |
155 | ||
156 | seen_pid = true; | |
157 | } | |
158 | ||
159 | close (pipefd[0]); | |
160 | ||
161 | int status; | |
162 | int err = waitpid (pid, &status, 0); | |
163 | if (err != pid) | |
164 | { | |
165 | puts ("errnor: waitpid failed"); | |
166 | exit (1); | |
167 | } | |
168 | ||
169 | if (!seen_pid) | |
170 | { | |
171 | puts ("error: didn't get PID"); | |
172 | exit (1); | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } |