[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/resolv/gai_notify.c b/ap/libc/glibc/glibc-2.23/resolv/gai_notify.c
new file mode 100644
index 0000000..db99bf7
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/resolv/gai_notify.c
@@ -0,0 +1,132 @@
+/* Copyright (C) 2001-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <netdb.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <gai_misc.h>
+
+
+struct notify_func
+ {
+ void (*func) (sigval_t);
+ sigval_t value;
+ };
+
+static void *
+notify_func_wrapper (void *arg)
+{
+ gai_start_notify_thread ();
+ struct notify_func *const n = arg;
+ void (*func) (sigval_t) = n->func;
+ sigval_t value = n->value;
+ free (n);
+ (*func) (value);
+ return NULL;
+}
+
+
+int
+internal_function
+__gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
+{
+ int result = 0;
+
+ /* Send the signal to notify about finished processing of the request. */
+ if (sigev->sigev_notify == SIGEV_THREAD)
+ {
+ /* We have to start a thread. */
+ pthread_t tid;
+ pthread_attr_t attr, *pattr;
+
+ pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
+ if (pattr == NULL)
+ {
+ pthread_attr_init (&attr);
+ pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
+ pattr = &attr;
+ }
+
+ /* SIGEV may be freed as soon as we return, so we cannot let the
+ notification thread use that pointer. Even though a sigval_t is
+ only one word and the same size as a void *, we cannot just pass
+ the value through pthread_create as the argument and have the new
+ thread run the user's function directly, because on some machines
+ the calling convention for a union like sigval_t is different from
+ that for a pointer type like void *. */
+ struct notify_func *nf = malloc (sizeof *nf);
+ if (nf == NULL)
+ result = -1;
+ else
+ {
+ nf->func = sigev->sigev_notify_function;
+ nf->value = sigev->sigev_value;
+ if (pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
+ {
+ free (nf);
+ result = -1;
+ }
+ }
+ }
+ else if (sigev->sigev_notify == SIGEV_SIGNAL)
+ /* We have to send a signal. */
+ if (__gai_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
+ < 0)
+ result = -1;
+
+ return result;
+}
+
+
+void
+internal_function
+__gai_notify (struct requestlist *req)
+{
+ struct waitlist *waitlist;
+
+ /* Now also notify possibly waiting threads. */
+ waitlist = req->waiting;
+ while (waitlist != NULL)
+ {
+ struct waitlist *next = waitlist->next;
+
+ if (waitlist->sigevp == NULL)
+ {
+#ifdef DONT_NEED_GAI_MISC_COND
+ GAI_MISC_NOTIFY (waitlist);
+#else
+ /* Decrement the counter. */
+ --*waitlist->counterp;
+
+ pthread_cond_signal (waitlist->cond);
+#endif
+ }
+ else
+ /* This is part of an asynchronous `getaddrinfo_a' operation. If
+ this request is the last one, send the signal. */
+ if (--*waitlist->counterp == 0)
+ {
+ __gai_notify_only (waitlist->sigevp, waitlist->caller_pid);
+ /* This is tricky. See getaddrinfo_a.c for the reason why
+ this works. */
+ free ((void *) waitlist->counterp);
+ }
+
+ waitlist = next;
+ }
+}