pjlib/src/pj/sock_select.c

/* $Id$ */
/* 
 * Copyright (C)2003-2006 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 
 */
#include <pj/sock_select.h>
#include <pj/compat/socket.h>
#include <pj/os.h>
#include <pj/assert.h>
#include <pj/errno.h>

#if defined(PJ_HAS_STRING_H) && PJ_HAS_STRING_H!=0
#   include <string.h>
#endif

#if defined(PJ_HAS_SYS_TIME_H) && PJ_HAS_SYS_TIME_H!=0
#   include <sys/time.h>
#endif

#ifdef _MSC_VER
#   pragma warning(disable: 4018)    // Signed/unsigned mismatch in FD_*
#   pragma warning(disable: 4389)    // Signed/unsigned mismatch in FD_*
#endif

#define PART_FDSET(ps)		((fd_set*)&ps->data[1])
#define PART_FDSET_OR_NULL(ps)	(ps ? PART_FDSET(ps) : NULL)
#define PART_COUNT(ps)		(ps->data[0])

PJ_DEF(void) PJ_FD_ZERO(pj_fd_set_t *fdsetp)
{
    PJ_CHECK_STACK();
    pj_assert(sizeof(pj_fd_set_t)-sizeof(pj_sock_t) >= sizeof(fd_set));

    FD_ZERO(PART_FDSET(fdsetp));
    PART_COUNT(fdsetp) = 0;
}


PJ_DEF(void) PJ_FD_SET(pj_sock_t fd, pj_fd_set_t *fdsetp)
{
    PJ_CHECK_STACK();
    pj_assert(sizeof(pj_fd_set_t)-sizeof(pj_sock_t) >= sizeof(fd_set));

    if (!PJ_FD_ISSET(fd, fdsetp))
        ++PART_COUNT(fdsetp);
    FD_SET(fd, PART_FDSET(fdsetp));
}


PJ_DEF(void) PJ_FD_CLR(pj_sock_t fd, pj_fd_set_t *fdsetp)
{
    PJ_CHECK_STACK();
    pj_assert(sizeof(pj_fd_set_t)-sizeof(pj_sock_t) >= sizeof(fd_set));

    if (PJ_FD_ISSET(fd, fdsetp))
        --PART_COUNT(fdsetp);
    FD_CLR(fd, PART_FDSET(fdsetp));
}


PJ_DEF(pj_bool_t) PJ_FD_ISSET(pj_sock_t fd, const pj_fd_set_t *fdsetp)
{
    PJ_CHECK_STACK();
    PJ_ASSERT_RETURN(sizeof(pj_fd_set_t)-sizeof(pj_sock_t) >= sizeof(fd_set),
                     0);

    return FD_ISSET(fd, PART_FDSET(fdsetp));
}

PJ_DEF(pj_size_t) PJ_FD_COUNT(const pj_fd_set_t *fdsetp)
{
    return PART_COUNT(fdsetp);
}

PJ_DEF(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)
{
    struct timeval os_timeout, *p_os_timeout;

    PJ_CHECK_STACK();

    PJ_ASSERT_RETURN(sizeof(pj_fd_set_t)-sizeof(pj_sock_t) >= sizeof(fd_set),
                     PJ_EBUG);

    if (timeout) {
	os_timeout.tv_sec = timeout->sec;
	os_timeout.tv_usec = timeout->msec * 1000;
	p_os_timeout = &os_timeout;
    } else {
	p_os_timeout = NULL;
    }

    return select(n, PART_FDSET_OR_NULL(readfds), PART_FDSET_OR_NULL(writefds),
		  PART_FDSET_OR_NULL(exceptfds), p_os_timeout);
}