uClibc: make res_init() thread safe

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>

SVN-Revision: 39178

toolchain/uClibc/patches-0.9.33.2/136-inet_make_res_init_thread_safe.patch

@@ -0,0 +1,55 @@
+--- a/libc/inet/resolv.c
++++ b/libc/inet/resolv.c
+@@ -3432,6 +3432,7 @@ static void res_sync_func(void)
+ 	 */
+ }
+ 
++/* has to be called under __resolv_lock */
+ static int
+ __res_vinit(res_state rp, int preinit)
+ {
+@@ -3440,7 +3441,6 @@ __res_vinit(res_state rp, int preinit)
+ 	int m = 0;
+ #endif
+ 
+-	__UCLIBC_MUTEX_LOCK(__resolv_lock);
+ 	__close_nameservers();
+ 	__open_nameservers();
+ 
+@@ -3532,7 +3532,6 @@ __res_vinit(res_state rp, int preinit)
+ 
+ 	rp->options |= RES_INIT;
+ 
+-	__UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+ 	return 0;
+ }
+ 
+@@ -3582,11 +3582,11 @@ res_init(void)
+ 	if (!_res.id)
+ 		_res.id = res_randomid();
+ 
+-	__UCLIBC_MUTEX_UNLOCK(__resolv_lock);
+-
+ 	__res_vinit(&_res, 1);
+ 	__res_sync = res_sync_func;
+ 
++	__UCLIBC_MUTEX_UNLOCK(__resolv_lock);
++
+ 	return 0;
+ }
+ libc_hidden_def(res_init)
+@@ -3687,7 +3687,11 @@ struct __res_state *__resp = &_res;
+ int
+ res_ninit(res_state statp)
+ {
+-	return __res_vinit(statp, 0);
++	int ret;
++	__UCLIBC_MUTEX_LOCK(__resolv_lock);
++	ret = __res_vinit(statp, 0);
++	__UCLIBC_MUTEX_UNLOCK(__resolv_lock);
++	return ret;
+ }
+ 
+ #endif /* L_res_init */
+--
+cgit v0.9.1