| 1 | /* Synchronous I/O multiplexing. Linux/microblaze version. |
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| 2 | Copyright (C) 2019-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <signal.h> |
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| 21 | #include <time.h> |
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| 22 | #include <sys/poll.h> |
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| 23 | #include <sysdep-cancel.h> |
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| 24 | |
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| 25 | #ifndef __ASSUME_TIME64_SYSCALL |
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| 26 | #include <sysdeps/unix/sysv/linux/pselect32.c> |
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| 27 | #elif !defined __ASSUME_PSELECT |
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| 28 | int |
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| 29 | __pselect32 (int nfds, fd_set *readfds, fd_set *writefds, |
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| 30 | fd_set *exceptfds, const struct __timespec64 *timeout, |
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| 31 | const sigset_t *sigmask) |
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| 32 | { |
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| 33 | /* The fallback uses 'select' which shows the race condition regarding |
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| 34 | signal mask set/restore, requires two additional syscalls, and has |
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| 35 | a worse timeout precision (microseconds instead of nanoseconds). */ |
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| 36 | |
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| 37 | struct timeval tv32, *ptv32 = NULL; |
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| 38 | if (timeout != NULL) |
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| 39 | { |
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| 40 | if (! valid_nanoseconds (timeout->tv_nsec)) |
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| 41 | { |
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| 42 | __set_errno (EINVAL); |
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| 43 | return -1; |
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| 44 | } |
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| 45 | |
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| 46 | tv32 = valid_timespec64_to_timeval (*timeout); |
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| 47 | ptv32 = &tv32; |
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| 48 | } |
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| 49 | |
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| 50 | sigset_t savemask; |
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| 51 | if (sigmask != NULL) |
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| 52 | __sigprocmask (SIG_SETMASK, sigmask, &savemask); |
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| 53 | |
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| 54 | /* select itself is a cancellation entrypoint. */ |
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| 55 | int ret = __select (nfds, readfds, writefds, exceptfds, ptv32); |
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| 56 | |
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| 57 | if (sigmask != NULL) |
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| 58 | __sigprocmask (SIG_SETMASK, &savemask, NULL); |
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| 59 | |
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| 60 | return ret; |
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| 61 | } |
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| 62 | #endif /* __ASSUME_PSELECT */ |
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| 63 | |
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