linux高性能服务器编程(tcp超时）

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#include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <stdlib.h> #include <assert.h> #include <stdio.h> #include <errno.h> #include <fcntl.h> #include <unistd.h> #include <string.h>   int timeout_connect( const char* ip, int port, int time ) {     int ret = 0;     struct sockaddr_in address;     bzero( &address, sizeof( address ) );     address.sin_family = AF_INET;     inet_pton( AF_INET, ip, &address.sin_addr );     address.sin_port = htons( port );       int sockfd = socket( PF_INET, SOCK_STREAM, 0 );     assert( sockfd >= 0 );       struct timeval timeout;     timeout.tv_sec = time;     timeout.tv_usec = 0;     socklen_t len = sizeof( timeout );     ret = setsockopt( sockfd, SOL_SOCKET, SO_SNDTIMEO, &timeout, len );     assert( ret != -1 );       ret = connect( sockfd, ( struct sockaddr* )&address, sizeof( address ) );     if ( ret == -1 )     {         if( errno == EINPROGRESS )         {             printf( "connecting timeout\n" );             return -1;         }         printf( "error occur when connecting to server\n" );         return -1;     }       return sockfd; }   int main( int argc, char* argv[] ) {     if( argc <= 2 )     {         printf( "usage: %s ip_address port_number\n", basename( argv[0] ) );         return 1;     }     const char* ip = argv[1];     int port = atoi( argv[2] );       int sockfd = timeout_connect( ip, port, 10 );     if ( sockfd < 0 )     {         return 1;     }     return 0; }