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1 | /* Test POSIX lock on an open file (lockf). |
2 | Copyright (C) 2019 Free Software Foundation, Inc. | |
3 | ||
4 | This program is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU General Public License | |
6 | as published by the Free Software Foundation; either version 2 | |
7 | of the License, or (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 <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <unistd.h> | |
19 | #include <stdint.h> | |
20 | #include <errno.h> | |
21 | #include <stdio.h> | |
22 | ||
23 | #include <support/temp_file.h> | |
24 | #include <support/capture_subprocess.h> | |
25 | #include <support/check.h> | |
26 | ||
27 | static char *temp_filename; | |
28 | static int temp_fd; | |
29 | ||
30 | static void | |
31 | do_prepare (int argc, char **argv) | |
32 | { | |
33 | temp_fd = create_temp_file ("tst-lockfd.", &temp_filename); | |
34 | TEST_VERIFY_EXIT (temp_fd != -1); | |
35 | } | |
36 | #define PREPARE do_prepare | |
37 | ||
38 | static void | |
39 | do_test_child_lockf (void *closure) | |
40 | { | |
41 | /* Check if parent has [0, 1024) locked. */ | |
42 | TEST_COMPARE (lseek (temp_fd, 0, SEEK_SET), 0); | |
43 | TEST_COMPARE (lockf (temp_fd, F_TLOCK, 1024), -1); | |
44 | TEST_COMPARE (errno, EAGAIN); | |
45 | TEST_COMPARE (lockf (temp_fd, F_TEST, 1024), -1); | |
46 | TEST_COMPARE (errno, EACCES); | |
47 | /* Also Check if parent has last 1024 bytes locked. */ | |
48 | TEST_COMPARE (lseek (temp_fd, INT32_MAX-1024, SEEK_SET), INT32_MAX-1024); | |
49 | TEST_COMPARE (lockf (temp_fd, F_TEST, 1024), -1); | |
50 | ||
51 | /* And try to lock [1024, 2048). */ | |
52 | TEST_COMPARE (lseek (temp_fd, 1024, SEEK_SET), 1024); | |
53 | TEST_COMPARE (lockf (temp_fd, F_LOCK, 1024), 0); | |
54 | ||
55 | /* Check if non-LFS interface cap access to 32-bif off_t. */ | |
56 | TEST_COMPARE (lseek64 (temp_fd, (off64_t)INT32_MAX, SEEK_SET), | |
57 | (off64_t)INT32_MAX); | |
58 | TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), 0); | |
59 | } | |
60 | ||
61 | static void | |
62 | do_test_child_lockf64 (void *closure) | |
63 | { | |
64 | /* Check if parent has [0, 1024) locked. */ | |
65 | TEST_COMPARE (lseek64 (temp_fd, 0, SEEK_SET), 0); | |
66 | TEST_COMPARE (lockf64 (temp_fd, F_TLOCK, 1024), -1); | |
67 | TEST_COMPARE (errno, EAGAIN); | |
68 | TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), -1); | |
69 | TEST_COMPARE (errno, EACCES); | |
70 | /* Also Check if parent has last 1024 bytes locked. */ | |
71 | TEST_COMPARE (lseek64 (temp_fd, INT32_MAX-1024, SEEK_SET), INT32_MAX-1024); | |
72 | TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), -1); | |
73 | ||
74 | /* And try to lock [1024, 2048). */ | |
75 | TEST_COMPARE (lseek64 (temp_fd, 1024, SEEK_SET), 1024); | |
76 | TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0); | |
77 | ||
78 | /* And also [INT32_MAX, INT32_MAX+1024). */ | |
79 | { | |
80 | off64_t off = (off64_t)INT32_MAX; | |
81 | TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off); | |
82 | TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0); | |
83 | } | |
84 | ||
85 | /* Check if [INT32_MAX+1024, INT64_MAX) is locked. */ | |
86 | { | |
87 | off64_t off = (off64_t)INT32_MAX+1024; | |
88 | TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off); | |
89 | TEST_COMPARE (lockf64 (temp_fd, F_TLOCK, 1024), -1); | |
90 | TEST_COMPARE (errno, EAGAIN); | |
91 | TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), -1); | |
92 | TEST_COMPARE (errno, EACCES); | |
93 | } | |
94 | } | |
95 | ||
96 | static int | |
97 | do_test (void) | |
98 | { | |
99 | /* Basic tests to check if a lock can be obtained and checked. */ | |
100 | TEST_COMPARE (lockf (temp_fd, F_LOCK, 1024), 0); | |
101 | TEST_COMPARE (lockf (temp_fd, F_LOCK, INT32_MAX), 0); | |
102 | TEST_COMPARE (lockf (temp_fd, F_TLOCK, 1024), 0); | |
103 | TEST_COMPARE (lockf (temp_fd, F_TEST, 1024), 0); | |
104 | TEST_COMPARE (lseek (temp_fd, 1024, SEEK_SET), 1024); | |
105 | TEST_COMPARE (lockf (temp_fd, F_ULOCK, 1024), 0); | |
106 | /* Parent process should have ([0, 1024), [2048, INT32_MAX)) ranges locked. */ | |
107 | ||
108 | { | |
109 | struct support_capture_subprocess result; | |
110 | result = support_capture_subprocess (do_test_child_lockf, NULL); | |
111 | support_capture_subprocess_check (&result, "lockf", 0, sc_allow_none); | |
112 | } | |
113 | ||
114 | if (sizeof (off_t) != sizeof (off64_t)) | |
115 | { | |
116 | /* Check if previously locked regions with LFS symbol. */ | |
117 | TEST_COMPARE (lseek (temp_fd, 0, SEEK_SET), 0); | |
118 | TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0); | |
119 | TEST_COMPARE (lockf64 (temp_fd, F_TLOCK, 1024), 0); | |
120 | TEST_COMPARE (lockf64 (temp_fd, F_TEST, 1024), 0); | |
121 | /* Lock region [INT32_MAX+1024, INT64_MAX). */ | |
122 | off64_t off = (off64_t)INT32_MAX + 1024; | |
123 | TEST_COMPARE (lseek64 (temp_fd, off, SEEK_SET), off); | |
124 | TEST_COMPARE (lockf64 (temp_fd, F_LOCK, 1024), 0); | |
125 | /* Parent process should have ([0, 1024), [2048, INT32_MAX), | |
126 | [INT32_MAX+1024, INT64_MAX)) ranges locked. */ | |
127 | ||
128 | { | |
129 | struct support_capture_subprocess result; | |
130 | result = support_capture_subprocess (do_test_child_lockf64, NULL); | |
131 | support_capture_subprocess_check (&result, "lockf", 0, sc_allow_none); | |
132 | } | |
133 | } | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | #include <support/test-driver.c> |