/****************************************************************************** Copyright (c) 1992, 1995, 1996 Xerox Corporation. All rights reserved. Portions of this code were written by Stephen White, aka ghond. Use and copying of this software and preparation of derivative works based upon this software are permitted. Any distribution of this software or derivative works must comply with all applicable United States export control laws. This software is made available AS IS, and Xerox Corporation makes no warranty about the software, its performance or its conformity to any specification. Any person obtaining a copy of this software is requested to send their name and post office or electronic mail address to: Pavel Curtis Xerox PARC 3333 Coyote Hill Rd. Palo Alto, CA 94304 Pavel@Xerox.Com *****************************************************************************/ /* Multiplexing wait implementation using the BSD UNIX select() system call */ #include <errno.h> /* errno */ #include "my-string.h" /* bzero() or memset(), used in FD_ZERO */ #include "my-sys-time.h" /* select(), struct timeval */ #include "my-types.h" /* fd_set, FD_ZERO(), FD_SET(), FD_ISSET() */ #include "log.h" #include "net_mplex.h" static fd_set input, output; static int max_descriptor; void mplex_clear(void) { FD_ZERO(&input); FD_ZERO(&output); max_descriptor = -1; } void mplex_add_reader(int fd) { FD_SET(fd, &input); if (fd > max_descriptor) max_descriptor = fd; } void mplex_add_writer(int fd) { FD_SET(fd, &output); if (fd > max_descriptor) max_descriptor = fd; } int mplex_wait(unsigned timeout) { struct timeval tv; int n; tv.tv_sec = timeout; tv.tv_usec = 0; n = select(max_descriptor + 1, (void *) &input, (void *) &output, 0, &tv); if (n < 0) { if (errno != EINTR) log_perror("Waiting for network I/O"); return 1; } else return (n == 0); } int mplex_is_readable(int fd) { return FD_ISSET(fd, &input); } int mplex_is_writable(int fd) { return FD_ISSET(fd, &output); } char rcsid_net_mp_selct[] = "$Id: net_mp_selct.c,v 2.1 1996/02/08 06:36:22 pavel Exp $"; /* $Log: net_mp_selct.c,v $ * Revision 2.1 1996/02/08 06:36:22 pavel * Updated copyright notice for 1996. Release 1.8.0beta1. * * Revision 2.0 1995/11/30 04:45:48 pavel * New baseline version, corresponding to release 1.8.0alpha1. * * Revision 1.3 1992/10/23 23:03:47 pavel * Added copyright notice. * * Revision 1.2 1992/10/23 19:38:51 pavel * Added missing #include of my-string.h. * * Revision 1.1 1992/09/23 17:14:17 pavel * Initial RCS-controlled version. */