FlowControlTestClient.c

#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

int connfd = -1;

void sig_alrm(int signo) 
{
    char c;
    char buf[100];
    send(connfd, buf, 100, MSG_OOB);
    printf("send 100 bytes OOB data\n");
}

int main(int argc, char *argv[])
{
    if (argc != 3) {
        printf("usage : %s <ip> <port>\n", argv[0]);
        exit(1);
    }
    int fd = -1;
    if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket fd create fail!");
        exit(1);
    }
    struct sockaddr_in svraddr;
    bzero(&svraddr, sizeof(svraddr));
    svraddr.sin_family = AF_INET;
    svraddr.sin_port = htons(atoi(argv[2]));
    svraddr.sin_addr.s_addr = inet_addr(argv[1]);
    
    ssize_t sndbuf = 10 << 10;
    if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf)) < 0) {
        perror("setsockopt error!");
        exit(1);
    }   
 
    if (connect(fd, (struct sockaddr *)&svraddr, sizeof(svraddr)) < 0) {
        perror("connect error!");
        exit(1);
    }
    
    if (signal(SIGALRM, sig_alrm) == SIG_ERR) {
        perror("signal error!");
        exit(1);
    } 
    
    alarm(20);
    ssize_t len = 6 << 10; 
    char buf[len];
    if (send(fd, buf, len, 0) < 0) {
        perror("send error!");
        exit(1);
    }     
    printf("all data finished!\n");
    connfd = fd; 
    for (;;) 
        sleep(1);
}