IP Networking

I want to set timout for a socket, but these do not work:

Code:

struct timeval timeout;
timeout.tv_sec = 3;
int m=setsockopt(icmp_sock, SOL_SOCKET, SO_RCVTIMEO, (struct timeval *)&timeout, sizeof(timeout));
if(m == -1) perror("set");
int q=setsockopt(icmp_sock, SOL_SOCKET, SO_SNDTIMEO, (struct timeval *)&timeout, sizeof(timeout));
if(q == -1) perror("set");

Output:

set: Numerical argument out of domain
set: Numerical argument out of domain


PS: on fedora14

thx!

I am not familiar with this particular error. I am running Ubuntu, and I looked at the man page for setsockopt. It can return EINVAL, which may be the error you receive. Teh reason for this error is that optlen (the last parameter) is invalid. Sometimes also when the optval is invalid.

In your specific code I detected two problems:
1. You didn't zero timeout.tv_usec. Perhaps it contained a garbage value that is invalid (too big).

2. The casting you are doing in the call itself do not conform to the definition of setsockopt(). Instead of (struct timeval *) use (void *). For the last parameter, I would use the cast (socklen_t).

1. You didn't zero timeout.tv_usec. Perhaps it contained a garbage value that is invalid (too big).

That is the problem. Thanks.

May be the struct timeval is a whole. the time described by the struct in microseconds is like this: timeout.tv_sec*1000000 + timout.tv_usec.

thkx