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SubjectKernel bug with UNIX sockets not detecting other end gone?

Hi,

I wonder if the following is a bug? It certainly differs from FreeBSD 4.2
behaviour, which gives the behaviour I would expect.

The following program blocks indefinitely on Linux (2.2, 2.4 not tested).
Since the other end is clearly gone, I would expect some sort of error
condition. Indeed, FreeBSD gives ECONNRESET.

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>

int
main(int argc, const char* argv[])
{
int the_sockets[2];
int retval;
char the_char;
int opt = 1;

retval = socketpair(PF_UNIX, SOCK_DGRAM, 0, the_sockets);
if (retval != 0)
{
perror("socketpair");
exit(1);
}
close(the_sockets[0]);
/* Linux (2.2) blocks here; FreeBSD does not */
retval = read(the_sockets[1], &the_char, sizeof(the_char));
}

Cheers
Chris

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