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authorBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2009-10-13 22:34:15 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2009-10-13 22:34:15 +0200
commitfea942bf0a3daf5e1eebc6a7a6f252abbba65009 (patch)
tree9eaaad692daf31ef9acf299e87aa37b1fd445152 /libc/inet
parent96a4928454fb7a8361a0b33940006ff491506f4d (diff)
libc/inet/resolv.c: reread resolv.conf if its mtime was changed
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libc/inet')
-rw-r--r--libc/inet/resolv.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c
index 66114668c..ee06b44be 100644
--- a/libc/inet/resolv.c
+++ b/libc/inet/resolv.c
@@ -312,6 +312,7 @@ Domain name in a message can be represented as either:
#include <arpa/nameser.h>
#include <sys/utsname.h>
#include <sys/un.h>
+#include <sys/stat.h>
#include <bits/uClibc_mutex.h>
/* poll() is not supported in kernel <= 2.0, therefore if __NR_poll is
@@ -948,7 +949,7 @@ static char *skip_and_NUL_space(char *p)
/* Must be called under __resolv_lock. */
void attribute_hidden __open_nameservers(void)
{
- static uint8_t last_time;
+ static uint32_t resolv_conf_mtime;
char szBuffer[MAXLEN_searchdomain];
FILE *fp;
@@ -956,11 +957,11 @@ void attribute_hidden __open_nameservers(void)
sockaddr46_t sa;
if (!__res_sync) {
- /* Provide for periodic reread of /etc/resolv.conf */
- /* cur_time "ticks" every 256 seconds */
- uint8_t cur_time = ((unsigned)time(NULL)) >> 8;
- if (last_time != cur_time) {
- last_time = cur_time;
+ /* Reread /etc/resolv.conf if it was modified. */
+ struct stat sb;
+ stat("/etc/resolv.conf", &sb);
+ if (resolv_conf_mtime != (uint32_t)sb.st_mtime) {
+ resolv_conf_mtime = sb.st_mtime;
__close_nameservers(); /* force config reread */
}
}
@@ -969,6 +970,7 @@ void attribute_hidden __open_nameservers(void)
goto sync;
fp = fopen("/etc/resolv.conf", "r");
+#ifdef FALLBACK_TO_CONFIG_RESOLVCONF
if (!fp) {
/* If we do not have a pre-populated /etc/resolv.conf then
try to use the one from /etc/config which exists on numerous
@@ -976,6 +978,7 @@ void attribute_hidden __open_nameservers(void)
may be the only /etc dir that was mounted rw. */
fp = fopen("/etc/config/resolv.conf", "r");
}
+#endif
if (fp) {
while (fgets(szBuffer, sizeof(szBuffer), fp) != NULL) {