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From b2ed906ec864583b43379ef9ad2b5630c1232565 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Thu, 31 Dec 2015 15:10:33 -0800
Subject: [PATCH 20/26] eglibc: cherry-picked from
http://www.eglibc.org/archives/patches/msg00772.html
Not yet merged into glibc
Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
resolv/res_libc.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/resolv/res_libc.c b/resolv/res_libc.c
index a4b376f..3256e12 100644
--- a/resolv/res_libc.c
+++ b/resolv/res_libc.c
@@ -21,11 +21,13 @@
#include <atomic.h>
#include <limits.h>
#include <sys/types.h>
+#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <libc-lock.h>
+__libc_lock_define_initialized (static, lock);
extern unsigned long long int __res_initstamp attribute_hidden;
/* We have atomic increment operations on 64-bit platforms. */
#if __WORDSIZE == 64
@@ -33,7 +35,6 @@ extern unsigned long long int __res_initstamp attribute_hidden;
# define atomicincunlock(lock) (void) 0
# define atomicinc(var) catomic_increment (&(var))
#else
-__libc_lock_define_initialized (static, lock);
# define atomicinclock(lock) __libc_lock_lock (lock)
# define atomicincunlock(lock) __libc_lock_unlock (lock)
# define atomicinc(var) ++var
@@ -92,7 +93,18 @@ res_init(void) {
int
__res_maybe_init (res_state resp, int preinit)
{
+ static time_t last_mtime;
+ struct stat statbuf;
+ int ret;
+
if (resp->options & RES_INIT) {
+ ret = stat (_PATH_RESCONF, &statbuf);
+ __libc_lock_lock (lock);
+ if ((ret == 0) && (last_mtime != statbuf.st_mtime)) {
+ last_mtime = statbuf.st_mtime;
+ atomicinc (__res_initstamp);
+ }
+ __libc_lock_unlock (lock);
if (__res_initstamp != resp->_u._ext.initstamp) {
if (resp->nscount > 0)
__res_iclose (resp, true);
--
2.10.2
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