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libavformat/os_support.c

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00001 /*
00002  * Various utilities for ffmpeg system
00003  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
00004  * copyright (c) 2002 Francois Revol
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 /* needed by inet_aton() */
00024 #define _SVID_SOURCE
00025 
00026 #include "config.h"
00027 #include "avformat.h"
00028 #include <unistd.h>
00029 #include <fcntl.h>
00030 #include <sys/time.h>
00031 #include "os_support.h"
00032 
00033 #if CONFIG_NETWORK
00034 #if !HAVE_POLL_H
00035 #if HAVE_WINSOCK2_H
00036 #include <winsock2.h>
00037 #elif HAVE_SYS_SELECT_H
00038 #include <sys/select.h>
00039 #endif
00040 #endif
00041 
00042 #include "network.h"
00043 
00044 #if !HAVE_INET_ATON
00045 #include <stdlib.h>
00046 #include <strings.h>
00047 
00048 int inet_aton (const char * str, struct in_addr * add)
00049 {
00050     unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
00051 
00052     if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
00053         return 0;
00054 
00055     if (!add1 || (add1|add2|add3|add4) > 255) return 0;
00056 
00057     add->s_addr=(add4<<24)+(add3<<16)+(add2<<8)+add1;
00058 
00059     return 1;
00060 }
00061 #endif /* !HAVE_INET_ATON */
00062 
00063 /* resolve host with also IP address parsing */
00064 int resolve_host(struct in_addr *sin_addr, const char *hostname)
00065 {
00066     struct hostent *hp;
00067 
00068     if (!inet_aton(hostname, sin_addr)) {
00069         hp = gethostbyname(hostname);
00070         if (!hp)
00071             return -1;
00072         memcpy(sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
00073     }
00074     return 0;
00075 }
00076 
00077 int ff_socket_nonblock(int socket, int enable)
00078 {
00079 #if HAVE_WINSOCK2_H
00080    return ioctlsocket(socket, FIONBIO, &enable);
00081 #else
00082    if (enable)
00083       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
00084    else
00085       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
00086 #endif
00087 }
00088 #endif /* CONFIG_NETWORK */
00089 
00090 #if CONFIG_FFSERVER
00091 #if !HAVE_POLL_H
00092 int poll(struct pollfd *fds, nfds_t numfds, int timeout)
00093 {
00094     fd_set read_set;
00095     fd_set write_set;
00096     fd_set exception_set;
00097     nfds_t i;
00098     int n;
00099     int rc;
00100 
00101 #if HAVE_WINSOCK2_H
00102     if (numfds >= FD_SETSIZE) {
00103         errno = EINVAL;
00104         return -1;
00105     }
00106 #endif
00107 
00108     FD_ZERO(&read_set);
00109     FD_ZERO(&write_set);
00110     FD_ZERO(&exception_set);
00111 
00112     n = -1;
00113     for(i = 0; i < numfds; i++) {
00114         if (fds[i].fd < 0)
00115             continue;
00116 #if !HAVE_WINSOCK2_H
00117         if (fds[i].fd >= FD_SETSIZE) {
00118             errno = EINVAL;
00119             return -1;
00120         }
00121 #endif
00122 
00123         if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
00124         if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
00125         if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
00126 
00127         if (fds[i].fd > n)
00128             n = fds[i].fd;
00129     };
00130 
00131     if (n == -1)
00132         /* Hey!? Nothing to poll, in fact!!! */
00133         return 0;
00134 
00135     if (timeout < 0)
00136         rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
00137     else {
00138         struct timeval    tv;
00139 
00140         tv.tv_sec = timeout / 1000;
00141         tv.tv_usec = 1000 * (timeout % 1000);
00142         rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
00143     };
00144 
00145     if (rc < 0)
00146         return rc;
00147 
00148     for(i = 0; i < (nfds_t) n; i++) {
00149         fds[i].revents = 0;
00150 
00151         if (FD_ISSET(fds[i].fd, &read_set))      fds[i].revents |= POLLIN;
00152         if (FD_ISSET(fds[i].fd, &write_set))     fds[i].revents |= POLLOUT;
00153         if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
00154     };
00155 
00156     return rc;
00157 }
00158 #endif /* HAVE_POLL_H */
00159 #endif /* CONFIG_FFSERVER */
00160 

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