1 | /* Test program for POSIX shm_* functions. |
2 | Copyright (C) 2000-2022 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 <error.h> |
21 | #include <fcntl.h> |
22 | #include <signal.h> |
23 | #include <stdio.h> |
24 | #include <stdlib.h> |
25 | #include <string.h> |
26 | #include <time.h> |
27 | #include <unistd.h> |
28 | #include <sys/mman.h> |
29 | #include <sys/stat.h> |
30 | #include <sys/wait.h> |
31 | |
32 | |
33 | /* We want to see output immediately. */ |
34 | #define STDOUT_UNBUFFERED |
35 | |
36 | static char shm_test_name[sizeof "/glibc-shm-test-" + sizeof (pid_t) * 3]; |
37 | static char shm_escape_name[sizeof "/../escaped-" + sizeof (pid_t) * 3]; |
38 | |
39 | static void |
40 | init_shm_test_names (void) |
41 | { |
42 | snprintf (s: shm_test_name, maxlen: sizeof (shm_test_name), format: "/glibc-shm-test-%u" , |
43 | getpid ()); |
44 | snprintf (s: shm_escape_name, maxlen: sizeof (shm_escape_name), format: "/../escaped-%u" , |
45 | getpid ()); |
46 | } |
47 | |
48 | static void |
49 | worker (int write_now) |
50 | { |
51 | struct timespec ts; |
52 | struct stat64 st; |
53 | int i; |
54 | |
55 | int fd = shm_open (name: shm_test_name, O_RDWR, mode: 0600); |
56 | |
57 | if (fd == -1) |
58 | error (EXIT_FAILURE, errnum: 0, format: "failed to open shared memory object: shm_open" ); |
59 | |
60 | char *mem; |
61 | |
62 | if (fd == -1) |
63 | exit (fd); |
64 | |
65 | if (fstat64 (fd: fd, buf: &st) == -1) |
66 | error (EXIT_FAILURE, errnum: 0, format: "stat failed" ); |
67 | if (st.st_size != 4000) |
68 | error (EXIT_FAILURE, errnum: 0, format: "size incorrect" ); |
69 | |
70 | mem = mmap (NULL, len: 4000, PROT_READ | PROT_WRITE, MAP_SHARED, fd: fd, offset: 0); |
71 | if (mem == MAP_FAILED) |
72 | error (EXIT_FAILURE, errnum: 0, format: "mmap failed" ); |
73 | |
74 | ts.tv_sec = 0; |
75 | ts.tv_nsec = 500000000; |
76 | |
77 | if (write_now) |
78 | for (i = 0; i <= 4; ++i) |
79 | mem[i] = i; |
80 | else |
81 | /* Wait until the first bytes of the memory region are 0, 1, 2, 3, 4. */ |
82 | while (1) |
83 | { |
84 | for (i = 0; i <= 4; ++i) |
85 | if (mem[i] != i) |
86 | break; |
87 | |
88 | if (i > 4) |
89 | /* OK, that's done. */ |
90 | break; |
91 | |
92 | nanosleep (requested_time: &ts, NULL); |
93 | } |
94 | |
95 | if (!write_now) |
96 | for (i = 0; i <= 4; ++i) |
97 | mem[i] = 4 + i; |
98 | else |
99 | /* Wait until the first bytes of the memory region are 4, 5, 6, 7, 8. */ |
100 | while (1) |
101 | { |
102 | for (i = 0; i <= 4; ++i) |
103 | if (mem[i] != 4 + i) |
104 | break; |
105 | |
106 | if (i > 4) |
107 | /* OK, that's done. */ |
108 | break; |
109 | |
110 | nanosleep (requested_time: &ts, NULL); |
111 | } |
112 | |
113 | if (munmap (addr: mem, len: 4000) == -1) |
114 | error (EXIT_FAILURE, errno, format: "munmap" ); |
115 | |
116 | close (fd: fd); |
117 | |
118 | exit (0); |
119 | } |
120 | |
121 | |
122 | static int |
123 | do_test (void) |
124 | { |
125 | int fd; |
126 | pid_t pid1; |
127 | pid_t pid2; |
128 | int status1; |
129 | int status2; |
130 | struct stat64 st; |
131 | |
132 | init_shm_test_names (); |
133 | |
134 | fd = shm_open (name: shm_escape_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, mode: 0600); |
135 | if (fd != -1) |
136 | { |
137 | perror ("read file outside of SHMDIR directory" ); |
138 | return 1; |
139 | } |
140 | |
141 | |
142 | /* Create the shared memory object. */ |
143 | fd = shm_open (name: shm_test_name, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, mode: 0600); |
144 | if (fd == -1) |
145 | { |
146 | /* If shm_open is unimplemented we skip the test. */ |
147 | if (errno == ENOSYS) |
148 | { |
149 | perror ("shm_open unimplemented. Test skipped." ); |
150 | return 0; |
151 | } |
152 | else |
153 | error (EXIT_FAILURE, errnum: 0, format: "failed to create shared memory object: shm_open" ); |
154 | } |
155 | |
156 | /* Size the object. We make it 4000 bytes long. */ |
157 | if (ftruncate (fd: fd, length: 4000) == -1) |
158 | { |
159 | /* This failed. Must be a bug in the implementation of the |
160 | shared memory itself. */ |
161 | perror ("failed to size of shared memory object: ftruncate" ); |
162 | close (fd: fd); |
163 | shm_unlink (name: shm_test_name); |
164 | return 0; |
165 | } |
166 | |
167 | if (fstat64 (fd: fd, buf: &st) == -1) |
168 | { |
169 | shm_unlink (name: shm_test_name); |
170 | error (EXIT_FAILURE, errnum: 0, format: "initial stat failed" ); |
171 | } |
172 | if (st.st_size != 4000) |
173 | { |
174 | shm_unlink (name: shm_test_name); |
175 | error (EXIT_FAILURE, errnum: 0, format: "initial size not correct" ); |
176 | } |
177 | |
178 | /* Spawn to processes which will do the work. */ |
179 | pid1 = fork (); |
180 | if (pid1 == 0) |
181 | worker (write_now: 0); |
182 | else if (pid1 == -1) |
183 | { |
184 | /* Couldn't create a second process. */ |
185 | perror ("fork" ); |
186 | close (fd: fd); |
187 | shm_unlink (name: shm_test_name); |
188 | return 0; |
189 | } |
190 | |
191 | pid2 = fork (); |
192 | if (pid2 == 0) |
193 | worker (write_now: 1); |
194 | else if (pid2 == -1) |
195 | { |
196 | /* Couldn't create a second process. */ |
197 | int ignore; |
198 | perror ("fork" ); |
199 | kill (pid: pid1, SIGTERM); |
200 | waitpid (pid: pid1, stat_loc: &ignore, options: 0); |
201 | close (fd: fd); |
202 | shm_unlink (name: shm_test_name); |
203 | return 0; |
204 | } |
205 | |
206 | /* Wait until the two processes are finished. */ |
207 | waitpid (pid: pid1, stat_loc: &status1, options: 0); |
208 | waitpid (pid: pid2, stat_loc: &status2, options: 0); |
209 | |
210 | /* Now we can unlink the shared object. */ |
211 | shm_unlink (name: shm_test_name); |
212 | |
213 | return (!WIFEXITED (status1) || WEXITSTATUS (status1) != 0 |
214 | || !WIFEXITED (status2) || WEXITSTATUS (status2) != 0); |
215 | } |
216 | |
217 | static void |
218 | cleanup_handler (void) |
219 | { |
220 | shm_unlink (name: shm_test_name); |
221 | } |
222 | |
223 | #define CLEANUP_HANDLER cleanup_handler |
224 | |
225 | #include <support/test-driver.c> |
226 | |