io.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * io.c: network I/O functions
 *****************************************************************************
 * Copyright (C) 2004-2005 the VideoLAN team
 * $Id: io.c 17659 2006-11-11 16:50:15Z md $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Rémi Denis-Courmont <rem # videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>
#include <vlc/vlc.h>

#include <errno.h>

#ifdef HAVE_FCNTL_H
#   include <fcntl.h>
#endif
#ifdef HAVE_SYS_TIME_H
#    include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif

#include "network.h"

#ifndef INADDR_ANY
#   define INADDR_ANY  0x00000000
#endif
#ifndef INADDR_NONE
#   define INADDR_NONE 0xFFFFFFFF
#endif

int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
                int i_protocol )
{
    int fd, i_val;

    fd = socket( i_family, i_socktype, i_protocol );
    if( fd == -1 )
    {
#if defined(WIN32) || defined(UNDER_CE)
        if( WSAGetLastError ( ) != WSAEAFNOSUPPORT )
            msg_Warn( p_this, "cannot create socket (%i)",
                      WSAGetLastError() );
#else
        if( errno != EAFNOSUPPORT )
            msg_Warn( p_this, "cannot create socket (%s)",
                      strerror( errno ) );
#endif
        return -1;
    }

#if defined( WIN32 ) || defined( UNDER_CE )
    {
        unsigned long i_dummy = 1;
        if( ioctlsocket( fd, FIONBIO, &i_dummy ) != 0 )
            msg_Err( p_this, "cannot set socket to non-blocking mode" );
    }
#else
    if( fd >= FD_SETSIZE )
    {
        /* We don't want to overflow select() fd_set */
        msg_Err( p_this, "cannot create socket (too many already in use)" );
        net_Close( fd );
        return -1;
    }

    fcntl( fd, F_SETFD, FD_CLOEXEC );
    i_val = fcntl( fd, F_GETFL, 0 );
    fcntl( fd, F_SETFL, ((i_val != -1) ? i_val : 0) | O_NONBLOCK );
#endif

    i_val = 1;
    setsockopt( fd, SOL_SOCKET, SO_REUSEADDR, (void *)&i_val,
                sizeof( i_val ) );

#ifdef IPV6_V6ONLY
    /*
     * Accepts only IPv6 connections on IPv6 sockets
     * (and open an IPv4 socket later as well if needed).
     * Only Linux and FreeBSD can map IPv4 connections on IPv6 sockets,
     * so this allows for more uniform handling across platforms. Besides,
     * it makes sure that IPv4 addresses will be printed as w.x.y.z rather
     * than ::ffff:w.x.y.z
     */
    if( i_family == AF_INET6 )
        setsockopt( fd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&i_val,
                    sizeof( i_val ) );
#endif

#if defined( WIN32 ) || defined( UNDER_CE )
# ifndef IPV6_PROTECTION_LEVEL
#  define IPV6_PROTECTION_LEVEL 23
# endif
    if( i_family == AF_INET6 )
    {
        i_val = 10 /*PROTECTION_LEVEL_UNRESTRICTED*/;
        setsockopt( fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
                   (const char*)&i_val, sizeof( i_val ) );
    }
#endif
    return fd;
}


/*****************************************************************************
 * __net_Close:
 *****************************************************************************
 * Close a network handle
 *****************************************************************************/
void net_Close( int fd )
{
#ifdef UNDER_CE
    CloseHandle( (HANDLE)fd );
#elif defined( WIN32 )
    closesocket( fd );
#else
    close( fd );
#endif
}

/*****************************************************************************
 * __net_Read:
 *****************************************************************************
 * Read from a network socket
 * If b_retry is true, then we repeat until we have read the right amount of
 * data
 *****************************************************************************/
int __net_Read( vlc_object_t *p_this, int fd, v_socket_t *p_vs,
                uint8_t *p_data, int i_data, vlc_bool_t b_retry )
{
    struct timeval  timeout;
    fd_set          fds_r, fds_e;
    int             i_recv;
    int             i_total = 0;
    int             i_ret;
    vlc_bool_t      b_die = p_this->b_die;

    while( i_data > 0 )
    {
        do
        {
            if( p_this->b_die != b_die )
            {
                return 0;
            }

            /* Initialize file descriptor set */
            FD_ZERO( &fds_r );
            FD_SET( fd, &fds_r );
            FD_ZERO( &fds_e );
            FD_SET( fd, &fds_e );

            /* We'll wait 0.5 second if nothing happens */
            timeout.tv_sec = 0;
            timeout.tv_usec = 500000;

        } while( (i_ret = select(fd + 1, &fds_r, NULL, &fds_e, &timeout)) == 0
                 || ( i_ret < 0 && errno == EINTR ) );

        if( i_ret < 0 )
        {
#if defined(WIN32) || defined(UNDER_CE)
            msg_Err( p_this, "network select error (%d)", WSAGetLastError() );
#else
            msg_Err( p_this, "network select error (%s)", strerror(errno) );
#endif
            return i_total > 0 ? i_total : -1;
        }

        if( ( i_recv = (p_vs != NULL)
              ? p_vs->pf_recv( p_vs->p_sys, p_data, i_data )
              : recv( fd, p_data, i_data, 0 ) ) < 0 )
        {
#if defined(WIN32) || defined(UNDER_CE)
            if( WSAGetLastError() == WSAEWOULDBLOCK )
            {
                /* only happens with p_vs (SSL) - not really an error */
            }
            else
            /* For udp only */
            /* On win32 recv() will fail if the datagram doesn't fit inside
             * the passed buffer, even though the buffer will be filled with
             * the first part of the datagram. */
            if( WSAGetLastError() == WSAEMSGSIZE )
            {
                msg_Err( p_this, "recv() failed. "
                         "Increase the mtu size (--mtu option)" );
                i_total += i_data;
            }
            else if( WSAGetLastError() == WSAEINTR ) continue;
            else msg_Err( p_this, "recv failed (%i)", WSAGetLastError() );
#else
            /* EAGAIN only happens with p_vs (TLS) and it's not an error */
            if( errno != EAGAIN )
                msg_Err( p_this, "recv failed (%s)", strerror(errno) );
#endif
            return i_total > 0 ? i_total : -1;
        }
        else if( i_recv == 0 )
        {
            /* Connection closed */
            b_retry = VLC_FALSE;
        }

        p_data += i_recv;
        i_data -= i_recv;
        i_total+= i_recv;
        if( !b_retry )
        {
            break;
        }
    }
    return i_total;
}

/*****************************************************************************
 * __net_ReadNonBlock:
 *****************************************************************************
 * Read from a network socket, non blocking mode (with timeout)
 *****************************************************************************/
int __net_ReadNonBlock( vlc_object_t *p_this, int fd, v_socket_t *p_vs,
                        uint8_t *p_data, int i_data, mtime_t i_wait)
{
    struct timeval  timeout;
    fd_set          fds_r, fds_e;
    int             i_recv;
    int             i_ret;

    /* Initialize file descriptor set */
    FD_ZERO( &fds_r );
    FD_SET( fd, &fds_r );
    FD_ZERO( &fds_e );
    FD_SET( fd, &fds_e );

    timeout.tv_sec = 0;
    timeout.tv_usec = i_wait;

    i_ret = select(fd + 1, &fds_r, NULL, &fds_e, &timeout);

    if( i_ret < 0 && errno == EINTR )
    {
        return 0;
    }
    else if( i_ret < 0 )
    {
#if defined(WIN32) || defined(UNDER_CE)
        msg_Err( p_this, "network select error (%d)", WSAGetLastError() );
#else
        msg_Err( p_this, "network select error (%s)", strerror(errno) );
#endif
        return -1;
    }
    else if( i_ret == 0)
    {
        return 0;
    }
    else
    {
#if !defined(UNDER_CE)
        if( fd == 0/*STDIN_FILENO*/ ) i_recv = read( fd, p_data, i_data ); else
#endif
        if( ( i_recv = (p_vs != NULL)
              ? p_vs->pf_recv( p_vs->p_sys, p_data, i_data )
              : recv( fd, p_data, i_data, 0 ) ) < 0 )
        {
#if defined(WIN32) || defined(UNDER_CE)
            /* For udp only */
            /* On win32 recv() will fail if the datagram doesn't fit inside
             * the passed buffer, even though the buffer will be filled with
             * the first part of the datagram. */
            if( WSAGetLastError() == WSAEMSGSIZE )
            {
                msg_Err( p_this, "recv() failed. "
                         "Increase the mtu size (--mtu option)" );