Hi,
with the attached test source, I get SIGLOST in recvfrom().
Basically what happens in recvfrom() is the following:
- the __socket_recv() RPC returns a MACH_PORT_NULL 'addrport'
- execution goes inside the if (addr != NULL)
- the __socket_whatis_address() RPC fails because of the null port (I
presume), so err is MACH_SEND_INVALID_DEST
- the generic if (err) is followed, and then __hurd_sockfail() raises
SIGLOST
The question is: is __socket_recv() supposed to actually return an
addrport in this case, or should recvfrom() just being able to
gracefully cope with this situation?
On Linux the address length is set to 0 by recvfrom(), so I guess that
this kind of sockets have no address?
--
Pino Toscano
#include sys/types.h
#include sys/socket.h
#include stdio.h
#include errno.h
#include string.h
#include unistd.h
#include stdlib.h
void die(int x, const char *s)
{
perror(s);
exit(x);
}
int main()
{
int ret;
int p[2];
char buf[2];
char namebuf[256];
socklen_t bufsize = sizeof(namebuf);
ret = socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p);
if (ret) die(1, socketpair);
ret = send(p[0], xyz, 3, 0);
printf( send: %d\n, ret);
if (ret 0) die(2, send);
ret = recvfrom(p[1], buf, sizeof(buf), 0, (struct sockaddr *)namebuf, bufsize);
printf( recvfrom: %d, %d\n, ret, bufsize);
if (ret 0) die(3, recvfrom);
close(p[0]);
close(p[1]);
return 0;
}
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