]>
Commit | Line | Data |
---|---|---|
323592fd | 1 | /* futex helper functions for glibc-internal use. |
2b778ceb | 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
323592fd LM |
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 <sysdep.h> | |
21 | #include <time.h> | |
22 | #include <futex-internal.h> | |
23 | #include <kernel-features.h> | |
24 | ||
25 | #ifndef __ASSUME_TIME64_SYSCALLS | |
26 | static int | |
a2b9e1ec AZ |
27 | __futex_abstimed_wait_common32 (unsigned int* futex_word, |
28 | unsigned int expected, int op, | |
29 | const struct __timespec64* abstime, | |
30 | int private, bool cancel) | |
323592fd | 31 | { |
50e19ddf AZ |
32 | struct timespec ts32, *pts32 = NULL; |
33 | if (abstime != NULL) | |
34 | { | |
35 | if (! in_time_t_range (abstime->tv_sec)) | |
36 | return -EOVERFLOW; | |
37 | ||
38 | ts32 = valid_timespec64_to_timespec (*abstime); | |
39 | pts32 = &ts32; | |
40 | } | |
323592fd | 41 | |
a2b9e1ec AZ |
42 | if (cancel) |
43 | return INTERNAL_SYSCALL_CANCEL (futex, futex_word, op, expected, | |
44 | pts32, NULL /* Unused. */, | |
45 | FUTEX_BITSET_MATCH_ANY); | |
46 | else | |
47 | return INTERNAL_SYSCALL_CALL (futex, futex_word, op, expected, | |
50e19ddf | 48 | pts32, NULL /* Unused. */, |
323592fd LM |
49 | FUTEX_BITSET_MATCH_ANY); |
50 | } | |
9cb2c923 | 51 | #endif /* ! __ASSUME_TIME64_SYSCALLS */ |
323592fd | 52 | |
a2b9e1ec AZ |
53 | static int |
54 | __futex_abstimed_wait_common64 (unsigned int* futex_word, | |
55 | unsigned int expected, clockid_t clockid, | |
56 | const struct __timespec64* abstime, | |
57 | int private, bool cancel) | |
323592fd LM |
58 | { |
59 | unsigned int clockbit; | |
60 | int err; | |
61 | ||
62 | /* Work around the fact that the kernel rejects negative timeout values | |
63 | despite them being valid. */ | |
64 | if (__glibc_unlikely ((abstime != NULL) && (abstime->tv_sec < 0))) | |
65 | return ETIMEDOUT; | |
66 | ||
67 | if (! lll_futex_supported_clockid (clockid)) | |
68 | return EINVAL; | |
69 | ||
70 | clockbit = (clockid == CLOCK_REALTIME) ? FUTEX_CLOCK_REALTIME : 0; | |
71 | int op = __lll_private_flag (FUTEX_WAIT_BITSET | clockbit, private); | |
72 | ||
a2b9e1ec AZ |
73 | if (cancel) |
74 | err = INTERNAL_SYSCALL_CANCEL (futex_time64, futex_word, op, expected, | |
75 | abstime, NULL /* Unused. */, | |
76 | FUTEX_BITSET_MATCH_ANY); | |
77 | else | |
78 | err = INTERNAL_SYSCALL_CALL (futex_time64, futex_word, op, expected, | |
79 | abstime, NULL /* Ununsed. */, | |
323592fd LM |
80 | FUTEX_BITSET_MATCH_ANY); |
81 | #ifndef __ASSUME_TIME64_SYSCALLS | |
c6a1a261 | 82 | if (err == -ENOSYS) |
a2b9e1ec AZ |
83 | err = __futex_abstimed_wait_common32 (futex_word, expected, op, abstime, |
84 | private, cancel); | |
323592fd LM |
85 | #endif |
86 | ||
87 | switch (err) | |
88 | { | |
89 | case 0: | |
90 | case -EAGAIN: | |
91 | case -EINTR: | |
92 | case -ETIMEDOUT: | |
a3e7aead | 93 | case -EINVAL: |
323592fd LM |
94 | case -EOVERFLOW: /* Passed absolute timeout uses 64 bit time_t type, but |
95 | underlying kernel does not support 64 bit time_t futex | |
96 | syscalls. */ | |
97 | return -err; | |
98 | ||
99 | case -EFAULT: /* Must have been caused by a glibc or application bug. */ | |
323592fd LM |
100 | case -ENOSYS: /* Must have been caused by a glibc bug. */ |
101 | /* No other errors are documented at this time. */ | |
102 | default: | |
103 | futex_fatal_error (); | |
104 | } | |
105 | } | |
b2cdadde LM |
106 | |
107 | int | |
108 | __futex_abstimed_wait64 (unsigned int* futex_word, unsigned int expected, | |
109 | clockid_t clockid, | |
110 | const struct __timespec64* abstime, int private) | |
111 | { | |
a2b9e1ec AZ |
112 | return __futex_abstimed_wait_common64 (futex_word, expected, clockid, |
113 | abstime, private, false); | |
114 | } | |
cc5d5852 | 115 | libpthread_hidden_def (__futex_abstimed_wait64) |
b2cdadde | 116 | |
a2b9e1ec AZ |
117 | int |
118 | __futex_abstimed_wait_cancelable64 (unsigned int* futex_word, | |
119 | unsigned int expected, clockid_t clockid, | |
120 | const struct __timespec64* abstime, | |
121 | int private) | |
122 | { | |
123 | return __futex_abstimed_wait_common64 (futex_word, expected, clockid, | |
124 | abstime, private, true); | |
b2cdadde | 125 | } |
cc5d5852 | 126 | libpthread_hidden_def (__futex_abstimed_wait_cancelable64) |