UDP socket program__include_BUFLEN_char_sizeof_cli_

当前位置: 技术问答>linux和unix

UDP socket program

来源: 互联网发布时间：2016-03-18

本文导语: 写了个简单的udp server and client的code server运行后一直没有反应 client 运行后直接打出read failed: Connection refused 查了半天也不知道为什么请高人指点迷津 server code %%%%%%%%%%%%%%%%% #include #include ...

写了个简单的udp server and client的code
server运行后一直没有反应
client 运行后直接打出read failed: Connection refused

查了半天也不知道为什么请高人指点迷津

server code
%%%%%%%%%%%%%%%%%
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#define BUFLEN 1024
#define PORT 5090

int main(void)
{
struct sockaddr_in cli;
struct sockaddr_in ser;
    int s, i, j, m, pid, fd1[2], fd2[2], n, c, slen=sizeof(ser);
int clen=sizeof(cli);
    char buf[BUFLEN];
char pw[BUFLEN];
char ph[BUFLEN];
char cm[BUFLEN];
char pip[BUFLEN];
char mystruct[BUFLEN];
    if ((s=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
{
perror("cannot set up socket");
exit(1);
}

    memset((char *) &ser, 0, sizeof(ser));
    ser.sin_family = AF_INET;
    ser.sin_port = htons((uint16_t)PORT);
    ser.sin_addr.s_addr = htonl(INADDR_ANY);
    if (bind(s, (struct sockaddr *)&ser, sizeof(ser))==-1)
{
perror("cannot bind");
exit(1);
}


    while (1)
{
perror("inside while loop");//debug
        if (recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr*)&cli, &clen) h_addr,(char*)&cli.sin_addr.s_addr,myhost->h_length);
// memcpy(&sin.sin_addr.s_addr,myhost->h_addr,myhost->h_length);
else if ((cli.sin_addr.s_addr=inet_addr(argv[1]))==-1)
{
perror("cannot get host name");
exit(1);
}


    bzero((char *) &cli, sizeof(cli));
    cli.sin_family = AF_INET;
    cli.sin_port = htons((uint16_t)p);

s=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (s