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https://github.com/reactos/wine.git
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95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
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* poll function
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*
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* Copyright 2008 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#ifndef HAVE_POLL
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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/* we can't include winsock2.h here so we have to duplicate the definitions for Windows */
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#if defined(__MINGW32__) || defined(_MSC_VER)
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#define FD_SETSIZE 64
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typedef struct
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{
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unsigned int fd_count;
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int fd_array[FD_SETSIZE]; /* an array of SOCKETs */
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} fd_set;
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#define FD_ZERO(set) ((set)->fd_count = 0)
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#define FD_ISSET(fd, set) __WSAFDIsSet((fd), (set))
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#define FD_SET(fd, set) do { if ((set)->fd_count < FD_SETSIZE) (set)->fd_array[(set)->fd_count++]=(fd); } while(0)
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int __stdcall select(int,fd_set*,fd_set*,fd_set*,const struct timeval*);
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int __stdcall __WSAFDIsSet(int,fd_set*);
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#endif
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int poll( struct pollfd *fds, unsigned int count, int timeout )
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{
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fd_set read_set, write_set, except_set;
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unsigned int i;
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int maxfd = -1, ret;
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FD_ZERO( &read_set );
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FD_ZERO( &write_set );
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FD_ZERO( &except_set );
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for (i = 0; i < count; i++)
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{
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if (fds[i].fd == -1) continue;
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if (fds[i].events & (POLLIN|POLLPRI)) FD_SET( fds[i].fd, &read_set );
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if (fds[i].events & POLLOUT) FD_SET( fds[i].fd, &write_set );
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FD_SET( fds[i].fd, &except_set ); /* POLLERR etc. are always selected */
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if (fds[i].fd > maxfd) maxfd = fds[i].fd;
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}
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if (timeout != -1)
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{
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struct timeval tv;
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tv.tv_sec = timeout / 1000;
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tv.tv_usec = timeout % 1000;
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ret = select( maxfd + 1, &read_set, &write_set, &except_set, &tv );
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}
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else ret = select( maxfd + 1, &read_set, &write_set, &except_set, NULL );
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if (ret >= 0)
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{
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for (i = 0; i < count; i++)
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{
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fds[i].revents = 0;
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if (fds[i].fd == -1) continue;
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if (FD_ISSET( fds[i].fd, &read_set )) fds[i].revents |= POLLIN;
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if (FD_ISSET( fds[i].fd, &write_set )) fds[i].revents |= POLLOUT;
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if (FD_ISSET( fds[i].fd, &except_set )) fds[i].revents |= POLLERR;
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}
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}
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return ret;
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}
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#endif /* HAVE_POLL */
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