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getsockopt鍑芥暟鐨勫師鍨嬶細int getsockopt(int sockfd, int level, int optname, void *optval, socklen_t *optlen);

鍙傛暟璇存槑锛?/p>

• sockfd锛氬鎺ュ瓧鎻忚堪绗︼紱
• level锛氶€夐」鎵€灞炵殑鍗忚灞傦紱
• optname锛氶€夐」鐨勫悕瀛楋紱
• optval锛氱敤浜庡瓨鍌ㄩ€夐」鍊肩殑缂撳啿鍖猴紱
• optlen锛氳緭鍏ユ椂涓簅ptval缂撳啿鍖虹殑闀垮害锛岃緭鍑烘椂涓哄疄闄呰幏鍙栫殑閫夐」鍊肩殑闀垮害銆?/li>

绀轰緥浠ｇ爜锛?/p>

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    int optval;
    socklen_t optlen = sizeof(optval);

    // 鑾峰彇TCP_NODELAY閫夐」鐨勫綋鍓嶅€?/span>
    getsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &optval, &optlen);
    printf("TCP_NODELAY: %d\n", optval);

    // 鑾峰彇SO_RCVBUF閫夐」鐨勫綋鍓嶅€?/span>
    getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
    printf("SO_RCVBUF: %d\n", optval);

    return 0;
}

setsockopt鍑芥暟鐨勫師鍨嬶細int setsockopt(int sockfd, int level, int optname, const void *optval, socklen_t optlen);

鍙傛暟璇存槑锛?/p>

• sockfd锛氬鎺ュ瓧鎻忚堪绗︼紱
• level锛氶€夐」鎵€灞炵殑鍗忚灞傦紱
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• optval锛氭寚鍚戝瓨鏀鹃€夐」鍊肩殑缂撳啿鍖猴紱
• optlen锛歰ptval缂撳啿鍖虹殑闀垮害銆?/li>

绀轰緥浠ｇ爜锛?/p>

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    int optval = 1;
    socklen_t optlen = sizeof(optval);

    // 璁剧疆TCP_NODELAY閫夐」涓?
    setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &optval, optlen);

    // 璁剧疆SO_RCVBUF閫夐」涓?192
    optval = 8192;
    setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &optval, optlen);

    return 0;
}

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