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- /* Copyright (C) 1996-1998,2001,2002,2003,2006 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #include <features.h>
- #ifdef __USE_XOPEN2K
- #include <sys/syscall.h>
- #include <sys/select.h>
- #include <sys/time.h>
- #include <signal.h>
- #include <cancel.h>
- #if defined(__UCLIBC_USE_TIME64__)
- #include "internal/time64_helpers.h"
- #endif
- static int __NC(pselect)(int nfds, fd_set *readfds, fd_set *writefds,
- fd_set *exceptfds, const struct timespec *timeout,
- const sigset_t *sigmask)
- {
- #if defined(__NR_pselect6) || defined(__NR_pselect6_time64)
- /* The Linux kernel can in some situations update the timeout value.
- * We do not want that so use a local variable.
- */
- struct timespec _ts;
- /* Note: the system call expects 7 values but on most architectures
- we can only pass in 6 directly. If there is an architecture with
- support for more parameters a new version of this file needs to
- be created. */
- struct {
- __kernel_ulong_t ss;
- __kernel_size_t ss_len;
- } data;
- if (timeout != NULL) {
- _ts = *timeout;
- timeout = &_ts;
- }
- if (sigmask != NULL) {
- data.ss = (__kernel_ulong_t) sigmask;
- data.ss_len = __SYSCALL_SIGSET_T_SIZE;
- sigmask = (void *)&data;
- }
- #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_pselect6_time64)
- return INLINE_SYSCALL(pselect6_time64, 6, nfds, readfds, writefds, exceptfds, TO_TS64_P(timeout), sigmask);
- #else
- return INLINE_SYSCALL(pselect6, 6, nfds, readfds, writefds, exceptfds, timeout, sigmask);
- #endif
- #else
- struct timeval tval;
- int retval;
- sigset_t savemask;
- /* Change nanosecond number to microseconds. This might mean losing
- precision and therefore the `pselect` should be available. But
- for now it is hardly found. */
- if (timeout != NULL)
- TIMESPEC_TO_TIMEVAL (&tval, timeout);
- /* The setting and restoring of the signal mask and the select call
- should be an atomic operation. This can't be done without kernel
- help. */
- if (sigmask != NULL)
- sigprocmask (SIG_SETMASK, sigmask, &savemask);
- /* The comment below does not apply on uClibc, since we use __select_nocancel */
- /* Note the pselect() is a cancellation point. But since we call
- select() which itself is a cancellation point we do not have
- to do anything here. */
- retval = __NC(select)(nfds, readfds, writefds, exceptfds,
- timeout != NULL ? &tval : NULL);
- if (sigmask != NULL)
- sigprocmask (SIG_SETMASK, &savemask, NULL);
- return retval;
- #endif
- }
- CANCELLABLE_SYSCALL(int, pselect, (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
- const struct timespec *timeout, const sigset_t *sigmask),
- (nfds, readfds, writefds, exceptfds, timeout, sigmask))
- #endif
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