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d4697bc9 | 1 | /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
a63c7fa1 CM |
2 | This file is part of the GNU C Library. |
3 | Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. | |
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 | |
ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
a63c7fa1 CM |
18 | |
19 | #include <sys/time.h> | |
20 | #include <sys/types.h> | |
21 | #include <sys/select.h> | |
22 | #include <errno.h> | |
23 | #include <sysdep-cancel.h> | |
24 | ||
25 | /* Check the first NFDS descriptors each in READFDS (if not NULL) for read | |
26 | readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS | |
27 | (if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out | |
28 | after waiting the interval specified therein. Returns the number of ready | |
29 | descriptors, or -1 for errors. */ | |
30 | ||
31 | int | |
32 | __select(int nfds, fd_set *readfds, | |
33 | fd_set *writefds, fd_set *exceptfds, | |
34 | struct timeval *timeout) | |
35 | { | |
36 | int result; | |
37 | struct timespec ts, *tsp = NULL; | |
38 | ||
39 | if (timeout) | |
40 | { | |
41 | TIMEVAL_TO_TIMESPEC (timeout, &ts); | |
42 | tsp = &ts; | |
43 | } | |
44 | ||
45 | if (SINGLE_THREAD_P) | |
46 | { | |
47 | result = INLINE_SYSCALL (pselect6, 6, nfds, readfds, writefds, exceptfds, | |
48 | tsp, NULL); | |
49 | } | |
50 | else | |
51 | { | |
52 | int oldtype = LIBC_CANCEL_ASYNC (); | |
53 | ||
54 | result = INLINE_SYSCALL (pselect6, 6, nfds, readfds, writefds, exceptfds, | |
55 | tsp, NULL); | |
56 | ||
57 | LIBC_CANCEL_RESET (oldtype); | |
58 | } | |
59 | ||
60 | if (timeout) | |
61 | { | |
62 | /* Linux by default will update the timeout after a pselect6 syscall | |
63 | (though the pselect() glibc call suppresses this behavior). | |
64 | Since select() on Linux has the same behavior as the pselect6 | |
65 | syscall, we update the timeout here. */ | |
66 | TIMESPEC_TO_TIMEVAL (timeout, &ts); | |
67 | } | |
68 | ||
69 | return result; | |
70 | } | |
71 | libc_hidden_def (__select) | |
72 | ||
73 | weak_alias (__select, select) | |
74 | weak_alias (__select, __libc_select) |