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1 | /* Test for advisory record locking. | |
2 | Copyright (C) 2023-2024 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 <https://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <fcntl.h> | |
19 | #include <errno.h> | |
20 | #include <unistd.h> | |
21 | ||
22 | /* This is essentially the POSIX lockf. */ | |
23 | ||
24 | static int | |
25 | fcntl_lockf (int fd, int cmd, off_t len) | |
26 | { | |
27 | struct flock fl = { | |
28 | .l_type = F_WRLCK, | |
29 | .l_whence = SEEK_CUR, | |
30 | .l_len = len | |
31 | }; | |
32 | ||
33 | switch (cmd) | |
34 | { | |
35 | case F_TEST: | |
36 | fl.l_type = F_RDLCK; | |
37 | if (fcntl (fd, F_GETLK, &fl) < 0) | |
38 | return -1; | |
39 | if (fl.l_type == F_UNLCK || fl.l_pid == getpid ()) | |
40 | return 0; | |
41 | errno = EACCES; | |
42 | return -1; | |
43 | ||
44 | case F_ULOCK: | |
45 | fl.l_type = F_UNLCK; | |
46 | return fcntl (fd, F_SETLK, &fl); | |
47 | ||
48 | case F_LOCK: | |
49 | return fcntl (fd, F_SETLKW, &fl); | |
50 | ||
51 | case F_TLOCK: | |
52 | return fcntl (fd, F_SETLK, &fl); | |
53 | } | |
54 | ||
55 | errno = EINVAL; | |
56 | return -1; | |
57 | } | |
58 | ||
59 | static int | |
60 | fcntl64_lockf (int fd, int cmd, off64_t len64) | |
61 | { | |
62 | struct flock64 fl64 = { | |
63 | .l_type = F_WRLCK, | |
64 | .l_whence = SEEK_CUR, | |
65 | .l_len = len64 | |
66 | }; | |
67 | ||
68 | switch (cmd) | |
69 | { | |
70 | case F_TEST: | |
71 | fl64.l_type = F_RDLCK; | |
72 | if (fcntl64 (fd, F_GETLK64, &fl64) < 0) | |
73 | return -1; | |
74 | if (fl64.l_type == F_UNLCK || fl64.l_pid == getpid ()) | |
75 | return 0; | |
76 | errno = EACCES; | |
77 | return -1; | |
78 | ||
79 | case F_ULOCK: | |
80 | fl64.l_type = F_UNLCK; | |
81 | return fcntl64 (fd, F_SETLK64, &fl64); | |
82 | ||
83 | case F_LOCK: | |
84 | return fcntl64 (fd, F_SETLKW64, &fl64); | |
85 | ||
86 | case F_TLOCK: | |
87 | return fcntl64 (fd, F_SETLK64, &fl64); | |
88 | } | |
89 | ||
90 | errno = EINVAL; | |
91 | return -1; | |
92 | } | |
93 | ||
94 | #define TST_LOCKFD "tst-fcntl-lock." | |
95 | #define LOCKF fcntl_lockf | |
96 | #define LOCKF64 fcntl64_lockf | |
97 | #include "tst-lockf.c" |