diff options
author | David M. Lee <dlee@digium.com> | 2013-01-07 14:24:28 -0600 |
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committer | David M. Lee <dlee@digium.com> | 2013-01-07 14:24:28 -0600 |
commit | f3ab456a17af1c89a6e3be4d20c5944853df1cb0 (patch) | |
tree | d00e1a332cd038a6d906a1ea0ac91e1a4458e617 /pjlib/include/pj/sock_select.h |
Import pjproject-2.0.1
Diffstat (limited to 'pjlib/include/pj/sock_select.h')
-rw-r--r-- | pjlib/include/pj/sock_select.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/pjlib/include/pj/sock_select.h b/pjlib/include/pj/sock_select.h new file mode 100644 index 0000000..dc39db1 --- /dev/null +++ b/pjlib/include/pj/sock_select.h @@ -0,0 +1,152 @@ +/* $Id: sock_select.h 3553 2011-05-05 06:14:19Z nanang $ */ +/* + * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) + * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef __PJ_SELECT_H__ +#define __PJ_SELECT_H__ + +/** + * @file sock_select.h + * @brief Socket select(). + */ + +#include <pj/types.h> + +PJ_BEGIN_DECL + +/** + * @defgroup PJ_SOCK_SELECT Socket select() API. + * @ingroup PJ_IO + * @{ + * This module provides portable abstraction for \a select() like API. + * The abstraction is needed so that it can utilize various event + * dispatching mechanisms that are available across platforms. + * + * The API is very similar to normal \a select() usage. + * + * \section pj_sock_select_examples_sec Examples + * + * For some examples on how to use the select API, please see: + * + * - \ref page_pjlib_select_test + */ + +/** + * Portable structure declarations for pj_fd_set. + * The implementation of pj_sock_select() does not use this structure + * per-se, but instead it will use the native fd_set structure. However, + * we must make sure that the size of pj_fd_set_t can accomodate the + * native fd_set structure. + */ +typedef struct pj_fd_set_t +{ + pj_sock_t data[PJ_IOQUEUE_MAX_HANDLES+ 4]; /**< Opaque buffer for fd_set */ +} pj_fd_set_t; + + +/** + * Initialize the descriptor set pointed to by fdsetp to the null set. + * + * @param fdsetp The descriptor set. + */ +PJ_DECL(void) PJ_FD_ZERO(pj_fd_set_t *fdsetp); + + +/** + * This is an internal function, application shouldn't use this. + * + * Get the number of descriptors in the set. This is defined in sock_select.c + * This function will only return the number of sockets set from PJ_FD_SET + * operation. When the set is modified by other means (such as by select()), + * the count will not be reflected here. + * + * @param fdsetp The descriptor set. + * + * @return Number of descriptors in the set. + */ +PJ_DECL(pj_size_t) PJ_FD_COUNT(const pj_fd_set_t *fdsetp); + + +/** + * Add the file descriptor fd to the set pointed to by fdsetp. + * If the file descriptor fd is already in this set, there shall be no effect + * on the set, nor will an error be returned. + * + * @param fd The socket descriptor. + * @param fdsetp The descriptor set. + */ +PJ_DECL(void) PJ_FD_SET(pj_sock_t fd, pj_fd_set_t *fdsetp); + +/** + * Remove the file descriptor fd from the set pointed to by fdsetp. + * If fd is not a member of this set, there shall be no effect on the set, + * nor will an error be returned. + * + * @param fd The socket descriptor. + * @param fdsetp The descriptor set. + */ +PJ_DECL(void) PJ_FD_CLR(pj_sock_t fd, pj_fd_set_t *fdsetp); + + +/** + * Evaluate to non-zero if the file descriptor fd is a member of the set + * pointed to by fdsetp, and shall evaluate to zero otherwise. + * + * @param fd The socket descriptor. + * @param fdsetp The descriptor set. + * + * @return Nonzero if fd is member of the descriptor set. + */ +PJ_DECL(pj_bool_t) PJ_FD_ISSET(pj_sock_t fd, const pj_fd_set_t *fdsetp); + + +/** + * This function wait for a number of file descriptors to change status. + * The behaviour is the same as select() function call which appear in + * standard BSD socket libraries. + * + * @param n On Unices, this specifies the highest-numbered + * descriptor in any of the three set, plus 1. On Windows, + * the value is ignored. + * @param readfds Optional pointer to a set of sockets to be checked for + * readability. + * @param writefds Optional pointer to a set of sockets to be checked for + * writability. + * @param exceptfds Optional pointer to a set of sockets to be checked for + * errors. + * @param timeout Maximum time for select to wait, or null for blocking + * operations. + * + * @return The total number of socket handles that are ready, or + * zero if the time limit expired, or -1 if an error occurred. + */ +PJ_DECL(int) pj_sock_select( int n, + pj_fd_set_t *readfds, + pj_fd_set_t *writefds, + pj_fd_set_t *exceptfds, + const pj_time_val *timeout); + + +/** + * @} + */ + + +PJ_END_DECL + +#endif /* __PJ_SELECT_H__ */ |