C 语言里不支持的 TCP 窗口大小调整吗

[holinhot]

gcc version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC)编译的时候报错误。

*server2.c: In function ‘create_server_fd’: server2.c:81:42: error: ‘TCP_WINDOW_CLAMP’ undeclared (first use in this function) if (setsockopt(serverfd, SOL_SOCKET, TCP_WINDOW_CLAMP, (char )& WINDOW_CLAMP, sizeof(WINDOW_CLAMP)) < 0) ^ server2.c:81:42: note: each undeclared identifier is reported only once for each function it appears in

int serverfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
    int REUSEADDR = 1;
    int REUSEPORT = 1;
    int WINDOW_CLAMP = 1;
    if (setsockopt(serverfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&REUSEADDR, sizeof(REUSEADDR)) < 0)
        perror("setsockopt(SO_REUSEADDR) failed");
    if (setsockopt(serverfd, SOL_SOCKET, SO_REUSEPORT, (const char*)&REUSEPORT, sizeof(REUSEPORT)) < 0)
        perror("setsockopt(SO_REUSEPORT) failed");
    if (setsockopt(serverfd, SOL_SOCKET, TCP_WINDOW_CLAMP, (char *)& WINDOW_CLAMP, sizeof(WINDOW_CLAMP)) < 0)
        perror("setsockopt(TCP_WINDOW_CLAMP) failed");


    if (serverfd == -1)
        EXIT("create socket fail");

[jjshare]

头文件没引？

[holinhot]

@jjshare 有引入，前面加的两个 SO_REUSEPORT 和 SO_REUSEADDR 没问题

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <ctype.h>

[jedihy]

#include <netinet/tcp.h>

[holinhot]

@jedihy 引入 include <netinet/tcp.h>是不报错误了，不过 TCP_WINDOW_CLAMP 参数不生效。用 python 测试 TCP_WINDOW_CLAMP 是可以生效的。

[holinhot]

@jedihy 可以了 TCP_WINDOW_CLAMP 是 IPPROTO_TCP 下的参数。c 新手

[BrettD]

这报的是语法错误啊