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581c785b | 1 | /* Copyright (C) 2006-2022 Free Software Foundation, Inc. |
7c65e900 | 2 | This file is part of the GNU C Library. |
7c65e900 UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library 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 GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
7c65e900 UD |
17 | |
18 | #include <errno.h> | |
19 | #include <limits.h> | |
20 | #include <signal.h> | |
21 | #include <stddef.h> /* For NULL. */ | |
22 | #include <sys/poll.h> | |
23 | #include <sysdep-cancel.h> | |
48123656 | 24 | #include <time.h> |
7c65e900 UD |
25 | |
26 | ||
27 | int | |
28 | ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout, | |
29 | const sigset_t *sigmask) | |
30 | { | |
31 | int tval = -1; | |
32 | ||
33 | /* poll uses a simple millisecond value. Convert it. */ | |
34 | if (timeout != NULL) | |
35 | { | |
48123656 | 36 | if (timeout->tv_sec < 0 || ! valid_nanoseconds (timeout->tv_nsec)) |
7c65e900 UD |
37 | { |
38 | __set_errno (EINVAL); | |
39 | return -1; | |
40 | } | |
41 | ||
42 | if (timeout->tv_sec > INT_MAX / 1000 | |
43 | || (timeout->tv_sec == INT_MAX / 1000 | |
44 | && ((timeout->tv_nsec + 999999) / 1000000 > INT_MAX % 1000))) | |
45 | /* We cannot represent the timeout in an int value. Wait | |
46 | forever. */ | |
47 | tval = -1; | |
48 | else | |
49 | tval = (timeout->tv_sec * 1000 | |
50 | + (timeout->tv_nsec + 999999) / 1000000); | |
51 | } | |
52 | ||
53 | /* The setting and restoring of the signal mask and the select call | |
54 | should be an atomic operation. This can't be done without kernel | |
55 | help. */ | |
56 | sigset_t savemask; | |
57 | if (sigmask != NULL) | |
58 | __sigprocmask (SIG_SETMASK, sigmask, &savemask); | |
59 | ||
60 | /* Note the ppoll() is a cancellation point. But since we call | |
61 | poll() which itself is a cancellation point we do not have | |
62 | to do anything here. */ | |
63 | int retval = __poll (fds, nfds, tval); | |
64 | ||
65 | if (sigmask != NULL) | |
66 | __sigprocmask (SIG_SETMASK, &savemask, NULL); | |
67 | ||
68 | return retval; | |
69 | } | |
70 | ||
71 | #ifndef ppoll | |
d9a216c0 | 72 | libc_hidden_def (ppoll); |
7c65e900 | 73 | #endif |