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Subjectproblem with write() to a socket and EPIPE
From
Date
Hello,

I've the following problem.
If the peer has closed its socket connection the second write to this
socket should return -1 and errno should be set to EPIPE (if SIGPIPE is
set
to be ignored). This never happens with my code. Why?

OS: Linux (Debian 2.2r3)
kernel: 2.4.4
compiler: gcc-2.95.2
c-lib: libc-2.1.3

with best regards,
Oliver

(writen() is a member function of my socket C++-class)

ssize_t
sock::writen( const void * vptr, size_t n)
{
size_t nleft;
ssize_t nwritten;
const char *ptr;

ptr = static_cast< char * >( vptr);
nleft = n;

struct sigaction new_sa;
struct sigaction old_sa;

new_sa.sa_handler = SIG_IGN;
::sigemptyset( & new_sa.sa_mask);
new_sa.sa_flags = 0;
::sigaction( SIGPIPE, & new_sa, & old_sa);

while ( nleft > 0)
{
if ( ( nwritten = ::write( m_handle, ptr, nleft) ) <=
0)
{
if ( errno == EINTR)

nwritten = 0; /* and call
write() again */

else if ( errno == EPIPE)

return EOF; /* write to
socket with no readers */

else

throw net_io_ex( ::strerror( errno),
"writen()", __FILE__); /* error */

}

nleft -= nwritten;
ptr += nwritten;
}
/* set to its previous action */
::sigaction( SIGPIPE, & old_sa, 0);

return n;
}
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