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Diffstat (limited to 'c/src/lib/libnetworking/poll.h')
| -rw-r--r-- | c/src/lib/libnetworking/poll.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/c/src/lib/libnetworking/poll.h b/c/src/lib/libnetworking/poll.h new file mode 100644 index 0000000000..74dfca76c1 --- /dev/null +++ b/c/src/lib/libnetworking/poll.h @@ -0,0 +1,108 @@ +/*- + * Copyright (c) 1997 Peter Wemm <peter@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id$ + */ + +#ifndef _SYS_POLL_H_ +#define _SYS_POLL_H_ + +/* + * This file is intended to be compatable with the traditional poll.h. + */ + +/* + * This structure is passed as an array to poll(2). + */ +struct pollfd { + int fd; /* which file descriptor to poll */ + short events; /* events we are interested in */ + short revents; /* events found on return */ +}; + +/* + * Requestable events. If poll(2) finds any of these set, they are + * copied to revents on return. + * XXX Note that FreeBSD doesn't make much distinction between POLLPRI + * and POLLRDBAND since none of the file types have distinct priority + * bands - and only some have an urgent "mode". + * XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV + * POLLIN includes all of normal, band and urgent data. Most poll handlers + * on FreeBSD only treat it as "normal" data. + */ +#define POLLIN 0x0001 /* any readable data available */ +#define POLLPRI 0x0002 /* OOB/Urgent readable data */ +#define POLLOUT 0x0004 /* file descriptor is writeable */ +#define POLLRDNORM 0x0040 /* non-OOB/URG data available */ +#define POLLWRNORM POLLOUT /* no write type differentiation */ +#define POLLRDBAND 0x0080 /* OOB/Urgent readable data */ +#define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */ + +/* + * FreeBSD extensions: polling on a regular file might return one + * of these events (currently only supported on UFS). + */ +#define POLLEXTEND 0x0200 /* file may have been extended */ +#define POLLATTRIB 0x0400 /* file attributes may have changed */ +#define POLLNLINK 0x0800 /* (un)link/rename may have happened */ +#define POLLWRITE 0x1000 /* file's contents may have changed */ + +/* + * These events are set if they occur regardless of whether they were + * requested. + */ +#define POLLERR 0x0008 /* some poll error occurred */ +#define POLLHUP 0x0010 /* file descriptor was "hung up" */ +#define POLLNVAL 0x0020 /* requested events "invalid" */ + +#define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\ + POLLWRBAND|POLLERR|POLLHUP|POLLNVAL) + +/* + * Request that poll() wait forever. + * XXX in SYSV, this is defined in stropts.h, which is not included + * by poll.h. + */ +#define INFTIM (-1) + +#ifndef KERNEL + +#include <sys/cdefs.h> + +__BEGIN_DECLS +/* + * XXX logically, poll() should be declared in <poll.h>, but SVR4 at + * least has it here in <sys/poll.h>. + * XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the + * other BSDs. + */ +int poll __P((struct pollfd *_pfd, unsigned _nfds, int _timeout)); +__END_DECLS + +#endif /* !KERNEL */ + +#endif /* !_SYS_POLL_H_ */ |