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26f28fd7 | 1 | /* Linux select implementation. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
a63c7fa1 | 3 | This file is part of the GNU C Library. |
a63c7fa1 CM |
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 | ||
26f28fd7 AZ |
31 | #ifdef __NR__newselect |
32 | # undef __NR_select | |
33 | # define __NR_select __NR__newselect | |
34 | #endif | |
35 | ||
a63c7fa1 | 36 | int |
26f28fd7 AZ |
37 | __select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, |
38 | struct timeval *timeout) | |
a63c7fa1 | 39 | { |
26f28fd7 AZ |
40 | #ifdef __NR_select |
41 | return SYSCALL_CANCEL (select, nfds, readfds, writefds, exceptfds, | |
42 | timeout); | |
43 | #else | |
a63c7fa1 CM |
44 | int result; |
45 | struct timespec ts, *tsp = NULL; | |
46 | ||
47 | if (timeout) | |
48 | { | |
49 | TIMEVAL_TO_TIMESPEC (timeout, &ts); | |
50 | tsp = &ts; | |
51 | } | |
52 | ||
c6bb095e AZ |
53 | result = SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds, tsp, |
54 | NULL); | |
a63c7fa1 CM |
55 | |
56 | if (timeout) | |
57 | { | |
58 | /* Linux by default will update the timeout after a pselect6 syscall | |
59 | (though the pselect() glibc call suppresses this behavior). | |
60 | Since select() on Linux has the same behavior as the pselect6 | |
61 | syscall, we update the timeout here. */ | |
62 | TIMESPEC_TO_TIMEVAL (timeout, &ts); | |
63 | } | |
64 | ||
65 | return result; | |
26f28fd7 | 66 | #endif |
a63c7fa1 CM |
67 | } |
68 | libc_hidden_def (__select) | |
69 | ||
70 | weak_alias (__select, select) | |
71 | weak_alias (__select, __libc_select) |