projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 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/>. */ | |
| 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 | |
| 73 | /* __poll handles cancellation. */ | |
| 74 | LIBC_CANCEL_HANDLED (); | |
| d9a216c0 | 75 | libc_hidden_def (ppoll); |
| 7c65e900 | 76 | #endif |