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poll.h
/* Compatibility definitions for System V `poll' interface. Copyright (C) 1994-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. 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/>. */ #ifndef _SYS_POLL_H #define _SYS_POLL_H 1 #include <features.h> /* Get the platform dependent bits of `poll'. */ #include <bits/poll.h> #ifdef __USE_GNU # include <bits/types/__sigset_t.h> # include <bits/types/struct_timespec.h> #endif /* Type used for the number of file descriptors. */ typedef unsigned long int nfds_t; /* Data structure describing a polling request. */ struct pollfd { int fd; /* File descriptor to poll. */ short int events; /* Types of events poller cares about. */ short int revents; /* Types of events that actually occurred. */ }; __BEGIN_DECLS /* Poll the file descriptors described by the NFDS structures starting at FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for an event to occur; if TIMEOUT is -1, block until an event occurs. Returns the number of file descriptors with events, zero if timed out, or -1 for errors. This function is a cancellation point and therefore not marked with __THROW. */ extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout); #ifdef __USE_GNU /* Like poll, but before waiting the threads signal mask is replaced with that specified in the fourth parameter. For better usability, the timeout value is specified using a TIMESPEC object. This function is a cancellation point and therefore not marked with __THROW. */ extern int ppoll (struct pollfd *__fds, nfds_t __nfds, const struct timespec *__timeout, const __sigset_t *__ss); #endif __END_DECLS /* Define some inlines helping to catch common problems. */ #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function # include <bits/poll2.h> #endif #endif /* sys/poll.h */
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