linux修改超时时间设置

# 查看当前TCP连接超时时间
cat /proc/sys/net/ipv4/tcp_fin_timeout

# 修改TCP连接超时时间为30秒
echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout

http {
    server {
        location / {
            proxy_connect_timeout 30;
            proxy_send_timeout 30;
            proxy_read_timeout 30;
        }
    }
}

<IfModule mod_proxy.c>
    ProxyConnectTimeout 30
    ProxySendTimeout 30
    ProxyReadTimeout 30
</IfModule>

#include <stdio.h>
#include <sys/select.h>

int main() {
    fd_set readfds;
    struct timeval timeout;

    FD_ZERO(&readfds);
    FD_SET(0, &readfds);

    timeout.tv_sec = 30;  // 30秒超时
    timeout.tv_usec = 0;

    int ret = select(1, &readfds, NULL, NULL, &timeout);
    if (ret == -1) {
        perror("select");
    } else if (ret == 0) {
        printf("Timeout occurred\n");
    } else {
        printf("Data is available\n");
    }

    return 0;
}