[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/resolv/res_libc.c b/ap/libc/glibc/glibc-2.23/resolv/res_libc.c
new file mode 100644
index 0000000..a8394e0
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/resolv/res_libc.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 1995-1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#include <atomic.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <resolv.h>
+#include <libc-lock.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. */
+
+extern unsigned long long int __res_initstamp attribute_hidden;
+/* We have atomic increment operations on 64-bit platforms. */
+#if __WORDSIZE == 64
+# define atomicinclock(lock) (void) 0
+# 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
+#endif
+
+int
+res_init(void) {
+ extern int __res_vinit(res_state, int);
+
+ /*
+ * These three fields used to be statically initialized. This made
+ * it hard to use this code in a shared library. It is necessary,
+ * now that we're doing dynamic initialization here, that we preserve
+ * the old semantics: if an application modifies one of these three
+ * fields of _res before res_init() is called, res_init() will not
+ * alter them. Of course, if an application is setting them to
+ * _zero_ before calling res_init(), hoping to override what used
+ * to be the static default, we can't detect it and unexpected results
+ * will follow. Zero for any of these fields would make no sense,
+ * so one can safely assume that the applications were already getting
+ * unexpected results.
+ *
+ * _res.options is tricky since some apps were known to diddle the bits
+ * before res_init() was first called. We can't replicate that semantic
+ * with dynamic initialization (they may have turned bits off that are
+ * set in RES_DEFAULT). Our solution is to declare such applications
+ * "broken". They could fool us by setting RES_INIT but none do (yet).
+ */
+ if (!_res.retrans)
+ _res.retrans = RES_TIMEOUT;
+ if (!_res.retry)
+ _res.retry = 4;
+ if (!(_res.options & RES_INIT))
+ _res.options = RES_DEFAULT;
+ else if (_res.nscount > 0)
+ __res_iclose (&_res, true); /* Close any VC sockets. */
+
+ /*
+ * This one used to initialize implicitly to zero, so unless the app
+ * has set it to something in particular, we can randomize it now.
+ */
+ if (!_res.id)
+ _res.id = res_randomid();
+
+ atomicinclock (lock);
+ /* Request all threads to re-initialize their resolver states,
+ resolv.conf might have changed. */
+ atomicinc (__res_initstamp);
+ atomicincunlock (lock);
+
+ return (__res_vinit(&_res, 1));
+}
+
+/* Initialize resp if RES_INIT is not yet set or if res_init in some other
+ thread requested re-initializing. */
+int
+__res_maybe_init (res_state resp, int preinit)
+{
+ if (resp->options & RES_INIT) {
+ if (__res_initstamp != resp->_u._ext.initstamp) {
+ if (resp->nscount > 0)
+ __res_iclose (resp, true);
+ return __res_vinit (resp, 1);
+ }
+ return 0;
+ } else if (preinit) {
+ if (!resp->retrans)
+ resp->retrans = RES_TIMEOUT;
+ if (!resp->retry)
+ resp->retry = 4;
+ resp->options = RES_DEFAULT;
+ if (!resp->id)
+ resp->id = res_randomid ();
+ return __res_vinit (resp, 1);
+ } else
+ return __res_ninit (resp);
+}
+libc_hidden_def (__res_maybe_init)
+
+/* This needs to be after the use of _res in res_init, above. */
+#undef _res
+
+/* The resolver state for use by single-threaded programs.
+ This differs from plain `struct __res_state _res;' in that it doesn't
+ create a common definition, but a plain symbol that resides in .bss,
+ which can have an alias. */
+struct __res_state _res __attribute__ ((nocommon));
+
+#undef __resp
+__thread struct __res_state *__resp = &_res;
+extern __thread struct __res_state *__libc_resp
+ __attribute__ ((alias ("__resp"))) attribute_hidden;
+
+/* We declare this with compat_symbol so that it's not
+ visible at link time. Programs must use the accessor functions. */
+#ifdef SHARED
+# include <shlib-compat.h>
+compat_symbol (libc, _res, _res, GLIBC_2_0);
+#endif
+
+#include <shlib-compat.h>
+
+#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2)
+# undef res_init
+extern int __res_init_weak (void);
+weak_extern (__res_init_weak);
+strong_alias (__res_init, __res_init_weak);
+compat_symbol (libc, __res_init_weak, res_init, GLIBC_2_0);
+#endif