1/* Test for shm_open cancellation handling: BZ #18243.
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 <pthread.h>
20#include <sys/mman.h>
21#include <semaphore.h>
22#include <stdio.h>
23#include <fcntl.h>
24#include <unistd.h>
25#include <errno.h>
26#include <stdlib.h>
27
28static sem_t sem; /* Use to sync with thread start. */
29static char shm_name[sizeof "/glibc-shm_open-cancel-" + sizeof (pid_t) * 3];
30
31static void
32init_shm_name (void)
33{
34 snprintf (s: shm_name, maxlen: sizeof (shm_name), format: "/glibc-shm_open-cancel-%u",
35 getpid ());
36}
37
38static void
39remove_shm (int status, void *arg)
40{
41 shm_unlink (name: shm_name);
42}
43
44static void *
45tf (void *arg)
46{
47 pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, oldstate: 0);
48
49 if (sem_wait (sem: &sem) != 0)
50 {
51 printf (format: "error: sem_wait failed: %m");
52 exit (1);
53 }
54
55 if (pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, oldstate: 0) != 0)
56 {
57 printf (format: "error: pthread_setcancelstate failed: %m");
58 exit (1);
59 }
60
61 /* Neither sem_unlink or sem_open should act on thread cancellation. */
62 shm_unlink (name: shm_name);
63 on_exit (func: remove_shm, NULL);
64
65 int fd = shm_open (name: shm_name, O_CREAT, mode: 0600);
66 if (fd == -1)
67 {
68 int exit_code;
69 if (errno == ENOSYS || errno == EACCES)
70 exit_code = 77;
71 else
72 exit_code = 1;
73 exit (exit_code);
74 }
75
76 if (pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, oldstate: 0) != 0)
77 {
78 printf (format: "error: pthread_setcancelstate failed: %m");
79 exit (1);
80 }
81
82 if (close (fd: fd) != 0)
83 {
84 printf (format: "error: pthread_setcancelstate failed: %m");
85 exit (1);
86 }
87
88 return NULL;
89}
90
91static int
92do_test (void)
93{
94 pthread_t td;
95
96 init_shm_name ();
97
98 if (sem_init (sem: &sem, pshared: 0, value: 0))
99 {
100 printf (format: "error: sem_init failed: %m\n");
101 exit (1);
102 }
103
104 if (pthread_create (newthread: &td, NULL, start_routine: tf, NULL) != 0)
105 {
106 printf (format: "error: pthread_create failed: %m\n");
107 exit (1);
108 }
109
110 if (pthread_cancel (th: td) != 0)
111 {
112 printf (format: "error: pthread_cancel failed: %m\n");
113 exit (1);
114 }
115
116 if (sem_post (sem: &sem) != 0)
117 {
118 printf (format: "error: sem_post failed: %m\n");
119 exit (1);
120 }
121
122 void *r;
123 if (pthread_join (th: td, thread_return: &r) != 0)
124 {
125 printf (format: "error: pthread_join failed: %m\n");
126 exit (1);
127 }
128
129 if (r == PTHREAD_CANCELED)
130 {
131 puts (s: "error: pthread_join returned PTHREAD_CANCELED");
132 exit (1);
133 }
134
135 return 0;
136}
137
138#define TEST_FUNCTION do_test ()
139#include <test-skeleton.c>
140

source code of glibc/rt/tst-shm-cancel.c