1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
From 588d936b9aa65e7cc8b1eb2cad1d209087db43a9 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 20/24] 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 a8394e0..981ac7c 100644
--- a/resolv/res_libc.c
+++ b/resolv/res_libc.c
@@ -18,6 +18,7 @@
#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>
@@ -28,6 +29,7 @@
out) since res_init() should go into libc.so but the rest of that
file should not. */
+__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
@@ -35,7 +37,6 @@ 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
@@ -94,7 +95,18 @@ 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);
--
2.6.4
|
