61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/select.h>
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/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
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readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
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(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
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after waiting the interval specified therein. Additionally set the sigmask
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SIGMASK for this call. Returns the number of ready descriptors, or -1 for
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errors. */
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int
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__pselect (nfds, readfds, writefds, exceptfds, timeout, sigmask)
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int nfds;
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fd_set *readfds;
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fd_set *writefds;
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fd_set *exceptfds;
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const struct timespec *timeout;
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const sigset_t *sigmask;
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{
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struct timeval tval;
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int retval;
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sigset_t savemask;
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/* Change nanosecond number to microseconds. This may loose
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precision and therefore the `pselect` should be available. But
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for now it is hardly found. */
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if (timeout != NULL)
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TIMESPEC_TO_TIMEVAL (&tval, timeout);
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/* The setting and restoring of the signal mask and the select call
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should be an atomic operation. This can't be done without kernel
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help. */
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__sigprocmask (SIG_SETMASK, sigmask, &savemask);
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retval = __select (nfds, readfds, writefds, exceptfds,
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timeout != NULL ? &tval : NULL);
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__sigprocmask (SIG_SETMASK, &savemask, NULL);
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return retval;
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}
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weak_alias (__pselect, pselect)
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