1 files changed, 100 insertions, 0 deletions
diff --git a/resolv/gai_notify.c b/resolv/gai_notify.c
new file mode 100644
index 0000000000..b3e623a2af
--- /dev/null
+++ b/resolv/gai_notify.c
@@ -0,0 +1,100 @@
+/* Copyright (C) 2001 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <netdb.h>
+#include <pthread.h>
+#include <stdlib.h>
+
+#include "gai_misc.h"
+
+
+static void *
+notify_func_wrapper (void *arg)
+{
+  struct sigevent *sigev = arg;
+  sigev->sigev_notify_function (sigev->sigev_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;
+	}
+
+      if (pthread_create (&tid, pattr, notify_func_wrapper, sigev) < 0)
+	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;
+
+      /* Decrement the counter.  This is used in both cases.  */
+      --*waitlist->counterp;
+
+      if (waitlist->sigevp == NULL)
+	pthread_cond_signal (waitlist->cond);
+      else
+	/* This is part of a 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;
+    }
+}