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04277e02 | 1 | /* Copyright (C) 2006-2019 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/>. */ | |
7c65e900 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <limits.h> | |
21 | #include <signal.h> | |
22 | #include <stddef.h> /* For NULL. */ | |
23 | #include <sys/poll.h> | |
24 | #include <sysdep-cancel.h> | |
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 | { | |
36 | if (timeout->tv_sec < 0 | |
37 | || timeout->tv_nsec < 0 || timeout->tv_nsec >= 1000000000) | |
38 | { | |
39 | __set_errno (EINVAL); | |
40 | return -1; | |
41 | } | |
42 | ||
43 | if (timeout->tv_sec > INT_MAX / 1000 | |
44 | || (timeout->tv_sec == INT_MAX / 1000 | |
45 | && ((timeout->tv_nsec + 999999) / 1000000 > INT_MAX % 1000))) | |
46 | /* We cannot represent the timeout in an int value. Wait | |
47 | forever. */ | |
48 | tval = -1; | |
49 | else | |
50 | tval = (timeout->tv_sec * 1000 | |
51 | + (timeout->tv_nsec + 999999) / 1000000); | |
52 | } | |
53 | ||
54 | /* The setting and restoring of the signal mask and the select call | |
55 | should be an atomic operation. This can't be done without kernel | |
56 | help. */ | |
57 | sigset_t savemask; | |
58 | if (sigmask != NULL) | |
59 | __sigprocmask (SIG_SETMASK, sigmask, &savemask); | |
60 | ||
61 | /* Note the ppoll() is a cancellation point. But since we call | |
62 | poll() which itself is a cancellation point we do not have | |
63 | to do anything here. */ | |
64 | int retval = __poll (fds, nfds, tval); | |
65 | ||
66 | if (sigmask != NULL) | |
67 | __sigprocmask (SIG_SETMASK, &savemask, NULL); | |
68 | ||
69 | return retval; | |
70 | } | |
71 | ||
72 | #ifndef ppoll | |
d9a216c0 | 73 | libc_hidden_def (ppoll); |
7c65e900 | 74 | #endif |