UDP套接字设置超时 [英] UDP Socket Set Timeout
问题描述
我想设置一个100毫秒的超时的UDP套接字。我使用C.我已经张贴了我的下面code的relavent件。我不知道这是为什么不超时,但只是挂起时,它不会收到一个段。这是否不使用bind()方法绑定套接字上这只是工作的?
的#define TIMEOUT_MS 100 / *重传之间的秒数* /如果((rcv_sock =插座(PF_INET,SOCK_DGRAM,IPPROTO_UDP))小于0)
DieWithError(插座()失败);如果((rcv_sock =插座(PF_INET,SOCK_DGRAM,IPPROTO_UDP))小于0)
DieWithError(插座()失败);//为recv_socket设置定时器
静态INT超时= TIMEOUT_MS;
setsockopt的(rcv_sock,SOL_SOCKET,SO_RCVTIMEO,(字符*)及超时的sizeof(超时));如果(recvfrom的(rcv_sock,ackBuffer,sizeof的(ackBuffer),0,
(结构sockaddr *)及servAddr2,&安培; fromSize)LT; 0){
//超时达
的printf(Timout达到重新发送段%d个\\ n,SEQ_NUM);
num_timeouts ++;
}
的 SO_RCVTIMEO
选项需要一个 timeval结构
在 SYS / time.h中
中定义的,而不是像你传递给它一个整数。在的timeval结构
具有为秒域和微秒的字段。要将超时设置为100毫秒,下面应该做的伎俩:
timeval结构电视;
tv.tv_sec = 0;
tv.tv_usec = 100000;
如果(setsockopt的(rcv_sock,SOL_SOCKET,SO_RCVTIMEO,&放大器;电视,sizeof的(电视))小于0){
PERROR(错误);
}
I am trying to set a 100ms timeout on a UDP Socket. I am using C. I have posted relavent pieces of my code below. I am not sure why this is not timing out, but just hangs when it doesn't receive a segment. Does this only work on sockets that are not bound using the bind() method?
#define TIMEOUT_MS 100 /* Seconds between retransmits */
if ((rcv_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
DieWithError("socket() failed");
if ((rcv_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
DieWithError("socket() failed");
//set timer for recv_socket
static int timeout = TIMEOUT_MS;
setsockopt(rcv_sock, SOL_SOCKET, SO_RCVTIMEO,(char*)&timeout,sizeof(timeout));
if(recvfrom(rcv_sock, ackBuffer,sizeof(ackBuffer), 0,
(struct sockaddr *) &servAddr2, &fromSize) < 0){
//timeout reached
printf("Timout reached. Resending segment %d\n", seq_num);
num_timeouts++;
}
The SO_RCVTIMEO
option expects a struct timeval
defined in sys/time.h
, not an integer like you're passing to it. The timeval struct
has as field for seconds and a field for microseconds. To set the timeout to 100ms, the following should do the trick:
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 100000;
if (setsockopt(rcv_sock, SOL_SOCKET, SO_RCVTIMEO,&tv,sizeof(tv)) < 0) {
perror("Error");
}
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