1 | /* Check if posix_spawn does not act as a cancellation entrypoint. |
2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
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 | <https://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 (barrier: &b); |
43 | |
44 | posix_spawn_file_actions_t a; |
45 | if (posix_spawn_file_actions_init (file_actions: &a) != 0) |
46 | { |
47 | puts (s: "error: spawn_file_actions_init failed" ); |
48 | exit (1); |
49 | } |
50 | |
51 | if (posix_spawn_file_actions_adddup2 (file_actions: &a, fd: pipefd[1], STDOUT_FILENO) != 0) |
52 | { |
53 | puts (s: "error: spawn_file_actions_adddup2 failed" ); |
54 | exit (1); |
55 | } |
56 | |
57 | if (posix_spawn_file_actions_addclose (file_actions: &a, fd: pipefd[0]) != 0) |
58 | { |
59 | puts (s: "error: spawn_file_actions_addclose" ); |
60 | exit (1); |
61 | } |
62 | |
63 | char *argv[] = { (char *) _PATH_BSHELL, (char *) "-c" , (char *) "echo $$" , |
64 | NULL }; |
65 | if (posix_spawn (pid: &pid, _PATH_BSHELL, file_actions: &a, NULL, argv: argv, NULL) != 0) |
66 | { |
67 | puts (s: "error: spawn failed" ); |
68 | exit (1); |
69 | } |
70 | |
71 | return NULL; |
72 | } |
73 | |
74 | |
75 | static int |
76 | do_test (void) |
77 | { |
78 | /* The test basically pipe a 'echo $$' 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 (pipedes: pipefd) != 0) |
83 | { |
84 | puts (s: "error: pipe failed" ); |
85 | exit (1); |
86 | } |
87 | |
88 | /* Not interested in knowing when the pipe is closed. */ |
89 | xsignal (SIGPIPE, SIG_IGN); |
90 | |
91 | /* To synchronize with the thread. */ |
92 | if (pthread_barrier_init (barrier: &b, NULL, count: 2) != 0) |
93 | { |
94 | puts (s: "error: pthread_barrier_init failed" ); |
95 | exit (1); |
96 | } |
97 | |
98 | pthread_t th = xpthread_create (NULL, thread_func: &tf, NULL); |
99 | |
100 | if (pthread_cancel (th: th) != 0) |
101 | { |
102 | puts (s: "error: pthread_cancel failed" ); |
103 | return 1; |
104 | } |
105 | |
106 | xpthread_barrier_wait (barrier: &b); |
107 | |
108 | if (xpthread_join (thr: th) == PTHREAD_CANCELED) |
109 | { |
110 | puts (s: "error: thread cancelled" ); |
111 | exit (1); |
112 | } |
113 | |
114 | close (fd: pipefd[1]); |
115 | |
116 | /* The global 'pid' should be set by thread posix_spawn calling. Check |
117 | below if it was executed correctly and with expected output. */ |
118 | |
119 | char buf[64]; |
120 | ssize_t n; |
121 | bool seen_pid = false; |
122 | while (TEMP_FAILURE_RETRY ((n = read (pipefd[0], buf, sizeof (buf)))) > 0) |
123 | { |
124 | /* We only expect to read the PID. */ |
125 | char *endp; |
126 | long int rpid = strtol (buf, &endp, 10); |
127 | |
128 | if (*endp != '\n') |
129 | { |
130 | printf (format: "error: didn't parse whole line: \"%s\"\n" , buf); |
131 | exit (1); |
132 | } |
133 | if (endp == buf) |
134 | { |
135 | puts (s: "error: read empty line" ); |
136 | exit (1); |
137 | } |
138 | |
139 | if (rpid != pid) |
140 | { |
141 | printf (format: "error: found \"%s\", expected PID %ld\n" , buf, |
142 | (long int) pid); |
143 | exit (1); |
144 | } |
145 | |
146 | if (seen_pid) |
147 | { |
148 | puts (s: "error: found more than one PID line" ); |
149 | exit (1); |
150 | } |
151 | |
152 | seen_pid = true; |
153 | } |
154 | |
155 | close (fd: pipefd[0]); |
156 | |
157 | int status; |
158 | int err = waitpid (pid: pid, stat_loc: &status, options: 0); |
159 | if (err != pid) |
160 | { |
161 | puts (s: "errnor: waitpid failed" ); |
162 | exit (1); |
163 | } |
164 | |
165 | if (!seen_pid) |
166 | { |
167 | puts (s: "error: didn't get PID" ); |
168 | exit (1); |
169 | } |
170 | |
171 | return 0; |
172 | } |
173 | |