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* resolv/res_send.c (send_dg): Create sockets with non-blocking

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flag already set.
This commit is contained in:
Ulrich Drepper 2008-12-02 06:21:18 +00:00
parent 30c063710e
commit 9744268c10
2 changed files with 50 additions and 11 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2008-12-01 Ulrich Drepper <drepper@redhat.com>
* resolv/res_send.c (send_dg): Create sockets with non-blocking
flag already set.
* stdlib/setenv.c (unsetenv): Don't search environment if it does
not exist.
* stdlib/Makefile (tests): Add tst-unsetenv1.

58
resolv/res_send.c
View File

@ -95,6 +95,7 @@ static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixi
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <kernel-features.h>
#if PACKETSZ > 65536
#define MAXPACKET PACKETSZ
@ -103,6 +104,13 @@ static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixi
#endif
#ifndef __ASSUME_O_CLOEXEC
static int __have_o_nonblock;
#else
# define __have_o_nonblock 0
#endif
/* From ev_streams.c. */
static inline void
@ -920,8 +928,20 @@ send_dg(res_state statp,
if (EXT(statp).nssocks[ns] == -1) {
/* only try IPv6 if IPv6 NS and if not failed before */
if ((EXT(statp).nscount6 > 0) && !statp->ipv6_unavail) {
EXT(statp).nssocks[ns] =
socket(PF_INET6, SOCK_DGRAM, 0);
if (__have_o_nonblock >= 0) {
EXT(statp).nssocks[ns] =
socket(PF_INET6, SOCK_DGRAM|SOCK_NONBLOCK,
0);
#ifndef __ASSUME_O_CLOEXEC
if (__have_o_nonblock == 0)
__have_o_nonblock
= (EXT(statp).nssocks[ns] == -1
&& errno == EINVAL ? -1 : 1);
#endif
}
if (__have_o_nonblock < 0)
EXT(statp).nssocks[ns] =
socket(PF_INET6, SOCK_DGRAM, 0);
if (EXT(statp).nssocks[ns] < 0)
statp->ipv6_unavail = errno == EAFNOSUPPORT;
/* If IPv6 socket and nsap is IPv4, make it
@ -929,8 +949,22 @@ send_dg(res_state statp,
else if (nsap->sin6_family == AF_INET)
convaddr4to6(nsap);
}
if (EXT(statp).nssocks[ns] < 0)
EXT(statp).nssocks[ns] = socket(PF_INET, SOCK_DGRAM, 0);
if (EXT(statp).nssocks[ns] < 0) {
if (__have_o_nonblock >= 0) {
EXT(statp).nssocks[ns]
= socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK,
0);
#ifndef __ASSUME_O_CLOEXEC
if (__have_o_nonblock == 0)
__have_o_nonblock
= (EXT(statp).nssocks[ns] == -1
&& errno == EINVAL ? -1 : 1);
#endif
}
if (__have_o_nonblock < 0)
EXT(statp).nssocks[ns]
= socket(PF_INET, SOCK_DGRAM, 0);
}
if (EXT(statp).nssocks[ns] < 0) {
*terrno = errno;
Perror(statp, stderr, "socket(dg)", errno);
@ -955,13 +989,15 @@ send_dg(res_state statp,
__res_iclose(statp, false);
return (0);
}
/* Make socket non-blocking. */
int fl = __fcntl (EXT(statp).nssocks[ns], F_GETFL);
if (fl != -1)
__fcntl (EXT(statp).nssocks[ns], F_SETFL,
fl | O_NONBLOCK);
Dprint(statp->options & RES_DEBUG,
(stdout, ";; new DG socket\n"))
if (__have_o_nonblock < 0) {
/* Make socket non-blocking. */
int fl = __fcntl (EXT(statp).nssocks[ns], F_GETFL);
if (fl != -1)
__fcntl (EXT(statp).nssocks[ns], F_SETFL,
fl | O_NONBLOCK);
Dprint(statp->options & RES_DEBUG,
(stdout, ";; new DG socket\n"))
}
}
/*