diff options
Diffstat (limited to 'resolv/res_libc.c')
| -rw-r--r-- | resolv/res_libc.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/resolv/res_libc.c b/resolv/res_libc.c index ee3fa2114b..29e2340fea 100644 --- a/resolv/res_libc.c +++ b/resolv/res_libc.c @@ -22,12 +22,13 @@ #include <arpa/nameser.h> #include <resolv.h> #include <bits/libc-lock.h> - +#include <sys/stat.h> /* The following bit is copied from res_data.c (where it is #ifdef'ed 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 +36,6 @@ 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 +94,18 @@ 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); |