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 #include "config.h"
  23 #include "avformat.h"
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include "os_support.h"
  27
  28 #ifdef CONFIG_NETWORK
  29 #ifndef HAVE_POLL_H
  30 #ifdef HAVE_WINSOCK2_H
  31 #include <winsock2.h>
  32 #elif defined (HAVE_SYS_SELECT_H)
  33 #include <sys/select.h>
  34 #endif
  35 #endif
  36
  37 #include "network.h"
  38
  39 #if !defined(HAVE_INET_ATON)
  40 #include <stdlib.h>
  41 #include <strings.h>
  42
  43 int inet_aton (const char * str, struct in_addr * add)
  44 {
  45     unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
  46
  47     if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
  48         return 0;
  49
  50     if (!add1 || (add1|add2|add3|add4) > 255) return 0;
  51
  52     add->s_addr=(add4<<24)+(add3<<16)+(add2<<8)+add1;
  53
  54     return 1;
  55 }
  56 #endif /* !defined(HAVE_INET_ATON) */
  57
  58 /* resolve host with also IP address parsing */
  59 int resolve_host(struct in_addr *sin_addr, const char *hostname)
  60 {
  61     struct hostent *hp;
  62
  63     if (!inet_aton(hostname, sin_addr)) {
  64         hp = gethostbyname(hostname);
  65         if (!hp)
  66             return -1;
  67         memcpy(sin_addr, hp->h_addr, sizeof(struct in_addr));
  68     }
  69     return 0;
  70 }
  71
  72 int ff_socket_nonblock(int socket, int enable)
  73 {
  74 #ifdef HAVE_WINSOCK2_H
  75    return ioctlsocket(socket, FIONBIO, &enable);
  76 #else
  77    if (enable)
  78       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
  79    else
  80       return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
  81 #endif
  82 }
  83 #endif /* CONFIG_NETWORK */
  84
  85 #ifdef CONFIG_FFSERVER
  86 #ifndef HAVE_POLL_H
  87 int poll(struct pollfd *fds, nfds_t numfds, int timeout)
  88 {
  89     fd_set read_set;
  90     fd_set write_set;
  91     fd_set exception_set;
  92     nfds_t i;
  93     int n;
  94     int rc;
  95
  96 #ifdef HAVE_WINSOCK2_H
  97     if (numfds >= FD_SETSIZE) {
  98         errno = EINVAL;
  99         return -1;
 100     }
 101 #endif
 102
 103     FD_ZERO(&read_set);
 104     FD_ZERO(&write_set);
 105     FD_ZERO(&exception_set);
 106
 107     n = -1;
 108     for(i = 0; i < numfds; i++) {
 109         if (fds[i].fd < 0)
 110             continue;
 111 #ifndef HAVE_WINSOCK2_H
 112         if (fds[i].fd >= FD_SETSIZE) {
 113             errno = EINVAL;
 114             return -1;
 115         }
 116 #endif
 117
 118         if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
 119         if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
 120         if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
 121
 122         if (fds[i].fd > n)
 123             n = fds[i].fd;
 124     };
 125
 126     if (n == -1)
 127         /* Hey!? Nothing to poll, in fact!!! */
 128         return 0;
 129
 130     if (timeout < 0)
 131         rc = select(n+1, &read_set, &write_set, &exception_set, NULL);
 132     else {
 133         struct timeval    tv;
 134
 135         tv.tv_sec = timeout / 1000;
 136         tv.tv_usec = 1000 * (timeout % 1000);
 137         rc = select(n+1, &read_set, &write_set, &exception_set, &tv);
 138     };
 139
 140     if (rc < 0)
 141         return rc;
 142
 143     for(i = 0; i < (nfds_t) n; i++) {
 144         fds[i].revents = 0;
 145
 146         if (FD_ISSET(fds[i].fd, &read_set))      fds[i].revents |= POLLIN;
 147         if (FD_ISSET(fds[i].fd, &write_set))     fds[i].revents |= POLLOUT;
 148         if (FD_ISSET(fds[i].fd, &exception_set)) fds[i].revents |= POLLERR;
 149     };
 150
 151     return rc;
 152 }
 153 #endif /* HAVE_POLL_H */
 154 #endif /* CONFIG_FFSERVER */
 155