libavformat/os_support.c

   1 /*
   2  * Various utilities for ffmpeg system
   3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
   4  * copyright (c) 2002 Francois Revol
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /* needed by inet_aton() */
  24 #define _SVID_SOURCE
  25
  26 #include "config.h"
  27 #include "avformat.h"
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30 #include <sys/time.h>
  31 #include "os_support.h"
  32
  33 #if CONFIG_NETWORK
  34 #if !HAVE_POLL_H
  35 #if HAVE_WINSOCK2_H
  36 #include <winsock2.h>
  37 #elif HAVE_SYS_SELECT_H
  38 #include <sys/select.h>
  39 #endif
  40 #endif
  41
  42 #include "network.h"
  43
  44 #if !HAVE_INET_ATON
  45 #include <stdlib.h>
  46 #include <strings.h>
  47
  48 int inet_aton (const char * str, struct in_addr * add)
  49 {
  50     unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
  51
  52     if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
  53         return 0;
  54
  55     if (!add1 || (add1|add2|add3|add4) > 255) return 0;
  56
  57     add->s_addr=(add4<<24)+(add3<<16)+(add2<<8)+add1;
  58
  59     return 1;
  60 }
  61 #endif /* !HAVE_INET_ATON */
  62
  63 /* resolve host with also IP address parsing */
  64 int resolve_host(struct in_addr *sin_addr, const char *hostname)
  65 {
  66     struct hostent *hp;
  67
  68     if (!inet_aton(hostname, sin_addr)) {
  69         hp = gethostbyname(hostname);
  70         if (!hp)
  71             return -1;
  72         memcpy(sin_addr, hp->h_addr_list[0], sizeof(struct in_addr));
  73     }
  74     return 0;
  75 }
  76
  77 int ff_socket_nonblock(int socket, int enable)
  78 {
  79 #if HAVE_WINSOCK2_H
  80    return ioctlsocket(socket, FIONBIO, &enable);
  81 #else
  82    if (enable)
  83       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
  84    else
  85       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
  86 #endif
  87 }
  88 #endif /* CONFIG_NETWORK */
  89
  90 #if CONFIG_FFSERVER
  91 #if !HAVE_POLL_H
  92 int poll(struct pollfd *fds, nfds_t numfds, int timeout)
  93 {
  94     fd_set read_set;
  95     fd_set write_set;
  96     fd_set exception_set;
  97     nfds_t i;
  98     int n;
  99     int rc;
 100
 101 #if HAVE_WINSOCK2_H
 102     if (numfds >= FD_SETSIZE) {
 103         errno = EINVAL;
 104         return -1;
 105     }
 106 #endif
 107
 108     FD_ZERO(&read_set);
 109     FD_ZERO(&write_set);
 110     FD_ZERO(&exception_set);
 111
 112     n = -1;
 113     for(i = 0; i < numfds; i++) {
 114         if (fds[i].fd < 0)
 115             continue;
 116 #if !HAVE_WINSOCK2_H
 117         if (fds[i].fd >= FD_SETSIZE) {
 118             errno = EINVAL;
 119             return -1;
 120         }
 121 #endif
 122
 123         if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
 124         if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
 125         if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
 126
 127         if (fds[i].fd > n)
 128             n = fds[i].fd;
 129     };
 130
 131     if (n == -1)
 132         /* Hey!? Nothing to poll, in fact!!! */
 133         return 0;
 134
 135     if (timeout < 0)
 136         rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
 137     else {
 138         struct timeval    tv;
 139
 140         tv.tv_sec = timeout / 1000;
 141         tv.tv_usec = 1000 * (timeout % 1000);
 142         rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
 143     };
 144
 145     if (rc < 0)
 146         return rc;
 147
 148     for(i = 0; i < (nfds_t) n; i++) {
 149         fds[i].revents = 0;
 150
 151         if (FD_ISSET(fds[i].fd, &read_set))      fds[i].revents |= POLLIN;
 152         if (FD_ISSET(fds[i].fd, &write_set))     fds[i].revents |= POLLOUT;
 153         if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
 154     };
 155
 156     return rc;
 157 }
 158 #endif /* HAVE_POLL_H */
 159 #endif /* CONFIG_FFSERVER */
 160