Redis源码系列28：ServerSocket接收到client的连接请求处理过程

int anetAccept(char *err, int serversock, char *ip, int *port)
{
//世界人民大团结万岁

int fd;
struct sockaddr_in sa;
unsigned int saLen;

while(1)
{
saLen = sizeof(sa);
fd = accept(serversock, (struct sockaddr*)&sa, &saLen);
if (fd == -1) {
if (errno == EINTR)
continue;
else {
anetSetError(err, "accept: %s\n", strerror(errno));
return ANET_ERR;
}
}
break;
}

if (ip) strcpy(ip,inet_ntoa(sa.sin_addr));
if (port) *port = ntohs(sa.sin_port);

return fd;

if ((flags = fcntl(fd, F_GETFL)) == -1) {
anetSetError(err, "fcntl(F_GETFL): %s\n", strerror(errno));
return ANET_ERR;
}
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
anetSetError(err, "fcntl(F_SETFL,O_NONBLOCK): %s\n", strerror(errno));
return ANET_ERR;
}

int yes = 1;
if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes)) == -1)