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socketoptions.c
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socketoptions.c
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#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <signal.h>
#include <stdio.h>
int main(void)
{
int sockfd;
socklen_t i;
size_t len;
size_t t1, t2;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
i = sizeof(len);
if (getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &len, &i) < 0) {
perror(": getsockopt SO_RCVBUF");
} else {
printf("receive buffer size = %d\n", len);
}
if (getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &len, &i) < 0) {
perror(": getsockopt SO_SNDBUF");
} else {
printf("send buffer size = %d\n", len);
}
if (getsockopt(sockfd, SOL_SOCKET, SO_RCVLOWAT, &len, &i) < 0) {
perror(": getsockopt SO_RCVLOWAT");
} else {
printf("rcv low watermark= %d\n", len);
}
if (getsockopt(sockfd, SOL_SOCKET, SO_SNDLOWAT, &len, &i) < 0) {
perror(": getsockopt SO_SNDLOWAT");
} else {
printf("snd low watermark = %d\n", len);
}
t1 =1000000; t2 = sizeof(int);
if (setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &t1, t2) < 0) {
perror(": setsockopt SO_RCVBUF");
}
i = sizeof(len);
if (getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &len, &i) < 0) {
perror(": getsockopt SO_RCVBUF ");
} else {
printf("modified receive buffer size = %d\n", len);
}
t1 = 2; t2 = sizeof(int);
if (setsockopt(sockfd, SOL_SOCKET, SO_RCVLOWAT, &t1, t2) < 0) {
perror(": setsockopt SO_RCVLOWAT");
} else {
if (getsockopt(sockfd, SOL_SOCKET, SO_RCVLOWAT, &len, &i) < 0) {
perror(": getsockopt SO_RCVLOWAT");
} else {
printf("modified rcv low watermark= %d\n", len);
}
}
if (getsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &len, &i) < 0) {
perror(": getsockopt SO_TCPNODELAY");
} else {
printf("TCPNODELAY= %d\n", len);
}
#ifdef WinBuild
printf("Windows has no TCP_CORK.\n");
#elifdef MacBuild
printf("MAC has no TCP_CORK.\n");
#else
if (getsockopt(sockfd, IPPROTO_TCP, TCP_CORK, &len, &i) < 0) {
perror(": getsockopt SO_TCPNODELAY");
} else {
printf("TCPCORK= %d\n", len);
}
#endif
return(0);
}