forked from Archive/PX4-Autopilot
112 lines
4.2 KiB
C
112 lines
4.2 KiB
C
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/****************************************************************************
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* netutils/thttpd/fdwatch.h
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Derived from the file of the same name in THTTPD:
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*
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* Copyright <EFBFBD> 1999 by Jef Poskanzer <jef@mail.acme.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __NETUTILS_THTTPD_FDWATCH_H
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#define __NETUTILS_THTTPD_FDWATCH_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/* Define to enable detailed FDWATCH debug output */
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#undef CONFIG_THTTPD_FDWATCH_DEBUG
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#ifndef INFTIM
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# define INFTIM -1
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct fdwatch_s
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{
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struct pollfd *pollfds; /* Poll data (allocated) */
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void **client; /* Client data (allocated) */
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uint8_t *ready; /* The list of fds with activity (allocated) */
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uint8_t nfds; /* The configured maximum number of fds */
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uint8_t nwatched; /* The number of fds currently watched */
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uint8_t nactive; /* The number of fds with activity */
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uint8_t next; /* The index to the next client data */
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* Initialize the fdwatch data structures. Returns NULL on failure. */
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extern struct fdwatch_s *fdwatch_initialize(int nfds);
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/* Uninitialize the fwdatch data structure */
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extern void fdwatch_uninitialize(struct fdwatch_s *fw);
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/* Add a descriptor to the watch list */
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extern void fdwatch_add_fd(struct fdwatch_s *fw, int fd, void *client_data);
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/* Delete a descriptor from the watch list. */
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extern void fdwatch_del_fd(struct fdwatch_s *fw, int fd);
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/* Do the watch. Return value is the number of descriptors that are ready,
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* or 0 if the timeout expired, or -1 on errors. A timeout of INFTIM means
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* wait indefinitely.
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*/
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extern int fdwatch(struct fdwatch_s *fw, long timeout_msecs);
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/* Check if a descriptor was ready. */
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extern int fdwatch_check_fd(struct fdwatch_s *fw, int fd);
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/* Get the client data for the next returned event. Returns -1 when there
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* are no more events.
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*/
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extern void *fdwatch_get_next_client_data(struct fdwatch_s *fw);
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#endif /* __NETUTILS_THTTPD_FDWATCH_H */
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