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b168057a | 1 | /* Copyright (C) 2006-2015 Free Software Foundation, Inc. |
7c65e900 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2006. | |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <errno.h> | |
20 | #include <signal.h> | |
21 | #include <time.h> | |
22 | #include <sys/poll.h> | |
23 | #include <kernel-features.h> | |
24 | #include <sysdep-cancel.h> | |
25 | ||
26 | ||
27 | #ifdef __NR_pselect6 | |
22502ea2 | 28 | # ifndef __ASSUME_PSELECT |
7c65e900 UD |
29 | static int __generic_pselect (int nfds, fd_set *readfds, fd_set *writefds, |
30 | fd_set *exceptfds, | |
31 | const struct timespec *timeout, | |
5c983cdd | 32 | const sigset_t *sigmask); |
22502ea2 | 33 | # endif |
7c65e900 UD |
34 | |
35 | ||
36 | int | |
37 | __pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, | |
38 | const struct timespec *timeout, const sigset_t *sigmask) | |
39 | { | |
40 | /* The Linux kernel can in some situations update the timeout value. | |
41 | We do not want that so use a local variable. */ | |
42 | struct timespec tval; | |
43 | if (timeout != NULL) | |
44 | { | |
45 | tval = *timeout; | |
46 | timeout = &tval; | |
47 | } | |
48 | ||
49 | /* Note: the system call expects 7 values but on most architectures | |
50 | we can only pass in 6 directly. If there is an architecture with | |
51 | support for more parameters a new version of this file needs to | |
52 | be created. */ | |
53 | struct | |
54 | { | |
428bd707 L |
55 | __syscall_ulong_t ss; |
56 | __syscall_ulong_t ss_len; | |
7c65e900 UD |
57 | } data; |
58 | ||
428bd707 | 59 | data.ss = (__syscall_ulong_t) (uintptr_t) sigmask; |
7c65e900 UD |
60 | data.ss_len = _NSIG / 8; |
61 | ||
62 | int result; | |
63 | ||
5c983cdd UD |
64 | #ifndef CALL_PSELECT6 |
65 | # define CALL_PSELECT6(nfds, readfds, writefds, exceptfds, timeout, data) \ | |
66 | INLINE_SYSCALL (pselect6, 6, nfds, readfds, writefds, exceptfds, \ | |
67 | timeout, data) | |
68 | #endif | |
69 | ||
7c65e900 | 70 | if (SINGLE_THREAD_P) |
5c983cdd UD |
71 | result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout, |
72 | &data); | |
7c65e900 UD |
73 | else |
74 | { | |
75 | int oldtype = LIBC_CANCEL_ASYNC (); | |
76 | ||
5c983cdd UD |
77 | result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout, |
78 | &data); | |
7c65e900 UD |
79 | |
80 | LIBC_CANCEL_RESET (oldtype); | |
81 | } | |
82 | ||
83 | # ifndef __ASSUME_PSELECT | |
84 | if (result == -1 && errno == ENOSYS) | |
85 | result = __generic_pselect (nfds, readfds, writefds, exceptfds, timeout, | |
86 | sigmask); | |
87 | # endif | |
88 | ||
89 | return result; | |
90 | } | |
5c983cdd | 91 | weak_alias (__pselect, pselect) |
7c65e900 UD |
92 | |
93 | # ifndef __ASSUME_PSELECT | |
94 | # define __pselect static __generic_pselect | |
95 | # endif | |
96 | #endif | |
97 | ||
98 | #ifndef __ASSUME_PSELECT | |
99 | # include <misc/pselect.c> | |
100 | #endif |