1 /* Compatibility definitions for System V `poll' interface. 2 Copyright (C) 1994,1996-2001,2004,2005,2006 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 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 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _SYS_POLL_H 21 #define _SYS_POLL_H 1 22 23 #include <features.h> 24 25 /* Get the platform dependent bits of `poll'. */ 26 #include <bits/poll.h> 27 #ifdef __USE_GNU 28 /* Get the __sigset_t definition. */ 29 # include <bits/sigset.h> 30 /* Get the timespec definition. */ 31 # define __need_timespec 32 # include <time.h> 33 #endif 34 35 36 /* Type used for the number of file descriptors. */ 37 typedef unsigned long int nfds_t; 38 39 /* Data structure describing a polling request. */ 40 struct pollfd 41 { 42 int fd; /* File descriptor to poll. */ 43 short int events; /* Types of events poller cares about. */ 44 short int revents; /* Types of events that actually occurred. */ 45 }; 46 47 48 __BEGIN_DECLS 49 50 /* Poll the file descriptors described by the NFDS structures starting at 51 FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for 52 an event to occur; if TIMEOUT is -1, block until an event occurs. 53 Returns the number of file descriptors with events, zero if timed out, 54 or -1 for errors. 55 56 This function is a cancellation point and therefore not marked with 57 __THROW. */ 58 extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout); 59 60 #ifdef __USE_GNU 61 /* Like poll, but before waiting the threads signal mask is replaced 62 with that specified in the fourth parameter. For better usability, 63 the timeout value is specified using a TIMESPEC object. 64 65 This function is a cancellation point and therefore not marked with 66 __THROW. */ 67 extern int ppoll (struct pollfd *__fds, nfds_t __nfds, 68 __const struct timespec *__timeout, 69 __const __sigset_t *__ss); 70 #endif 71 72 __END_DECLS 73 74 #endif /* sys/poll.h */ 75
