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2279. [bug] Use setsockopt(SO_NOSIGPIPE), when available,

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to protect applications from receiving spurious
                        SIGPIPE signals when using the resolver.
This commit is contained in:
Mark Andrews
2007-12-14 03:52:40 +00:00
parent e8ca2abed7
commit da31aff2f2
3 changed files with 34 additions and 2 deletions
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16
lib/bind/resolv/res_send.c
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@@ -70,7 +70,7 @@
#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93";
static const char rcsid[] = "$Id: res_send.c,v 1.17 2006/10/16 22:54:38 marka Exp $";
static const char rcsid[] = "$Id: res_send.c,v 1.18 2007/12/14 03:52:40 marka Exp $";
#endif /* LIBC_SCCS and not lint */
/*! \file
@@ -601,6 +601,9 @@ send_vc(res_state statp,
u_short len;
u_char *cp;
void *tmp;
#ifdef SO_NOSIGPIPE
int on = 1;
#endif
nsap = get_nsaddr(statp, ns);
nsaplen = get_salen(nsap);
@@ -646,6 +649,17 @@ send_vc(res_state statp,
return (-1);
}
}
#ifdef SO_NOSIGPIPE
/*
* Disable generation of SIGPIPE when writing to a closed
* socket. Write should return -1 and set errno to EPIPE
* instead.
*
* Push on even if setsockopt(SO_NOSIGPIPE) fails.
*/
(void)setsockopt(statp->_vcsock, SOL_SOCKET, SO_NOSIGPIPE, &on,
sizeof(on));
#endif
errno = 0;
if (connect(statp->_vcsock, nsap, nsaplen) < 0) {
*terrno = errno;