wine/libs/port/poll.c
2008-12-24 10:05:19 +01:00

95 lines
2.8 KiB
C

/*
* poll function
*
* Copyright 2008 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#ifndef HAVE_POLL
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/* we can't include winsock2.h here so we have to duplicate the definitions for Windows */
#if defined(__MINGW32__) || defined(_MSC_VER)
#define FD_SETSIZE 64
typedef struct
{
unsigned int fd_count;
int fd_array[FD_SETSIZE]; /* an array of SOCKETs */
} fd_set;
#define FD_ZERO(set) ((set)->fd_count = 0)
#define FD_ISSET(fd, set) __WSAFDIsSet((fd), (set))
#define FD_SET(fd, set) do { if ((set)->fd_count < FD_SETSIZE) (set)->fd_array[(set)->fd_count++]=(fd); } while(0)
int __stdcall select(int,fd_set*,fd_set*,fd_set*,const struct timeval*);
int __stdcall __WSAFDIsSet(int,fd_set*);
#endif
int poll( struct pollfd *fds, unsigned int count, int timeout )
{
fd_set read_set, write_set, except_set;
unsigned int i;
int maxfd = -1, ret;
FD_ZERO( &read_set );
FD_ZERO( &write_set );
FD_ZERO( &except_set );
for (i = 0; i < count; i++)
{
if (fds[i].fd == -1) continue;
if (fds[i].events & (POLLIN|POLLPRI)) FD_SET( fds[i].fd, &read_set );
if (fds[i].events & POLLOUT) FD_SET( fds[i].fd, &write_set );
FD_SET( fds[i].fd, &except_set ); /* POLLERR etc. are always selected */
if (fds[i].fd > maxfd) maxfd = fds[i].fd;
}
if (timeout != -1)
{
struct timeval tv;
tv.tv_sec = timeout / 1000;
tv.tv_usec = timeout % 1000;
ret = select( maxfd + 1, &read_set, &write_set, &except_set, &tv );
}
else ret = select( maxfd + 1, &read_set, &write_set, &except_set, NULL );
if (ret >= 0)
{
for (i = 0; i < count; i++)
{
fds[i].revents = 0;
if (fds[i].fd == -1) continue;
if (FD_ISSET( fds[i].fd, &read_set )) fds[i].revents |= POLLIN;
if (FD_ISSET( fds[i].fd, &write_set )) fds[i].revents |= POLLOUT;
if (FD_ISSET( fds[i].fd, &except_set )) fds[i].revents |= POLLERR;
}
}
return ret;
}
#endif /* HAVE_POLL */