From 13505ca8fce1c22a7f124314a07b4ecbb62bee22 Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Tue, 10 May 2005 20:56:07 +0000
Subject: 	* Makefile.in (DLL_OFILES): Add fhandler_mailslot.o. 	*
 devices.h (FH_KMSG): Define new device. 	* devices.in: Add "/dev/kmsg"
 entry. 	* devices.cc: Regenerate. 	* dtable.cc (build_fh_pc):
 Handle case FH_KMSG. 	* fhandler.h (class fhandler_mailslot): New class. 
 (class select_stuff): Add device_specific_mailslot pointer. 	*
 fhandler_mailslot.cc: New file. 	* select.cc (peek_mailslot): New
 function. 	(verify_mailslot): Ditto. 	(struct mailslotinf): New
 stuct to handle select on mailslots. 	(thread_mailslot): New function. 
 (start_thread_mailslot): Ditto. 	(mailslot_cleanup): Ditto. 
 (fhandler_mailslot::select_read): New method. 	* syslog.cc (klog_guard): New
 muto. 	(dev_kmsg): Local mailslot for kernel message device. 	(vklog): New
 function. 	(klog): Ditto. 	* winsup.h (vklog): Declare. 	(klog): Ditto.
 	* include/sys/syslog.h: Define _PATH_KLOG.

---
 winsup/cygwin/syslog.cc | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'winsup/cygwin/syslog.cc')

diff --git a/winsup/cygwin/syslog.cc b/winsup/cygwin/syslog.cc
index b856bb7aa..38c8ecc31 100644
--- a/winsup/cygwin/syslog.cc
+++ b/winsup/cygwin/syslog.cc
@@ -461,6 +461,38 @@ syslog (int priority, const char *message, ...)
   va_end (ap);
 }
 
+static NO_COPY muto klog_guard;
+fhandler_mailslot *dev_kmsg;
+
+extern "C" void
+vklog (int priority, const char *message, va_list ap)
+{
+  /* TODO: kernel messages are under our control entirely and they should
+     be quick.  No playing with /dev/null, but a fixed upper size for now. */
+  char buf[2060];	/* 2048 + a prority */
+  __small_sprintf (buf, "<%d>", priority);
+  __small_vsprintf (buf + strlen (buf), message, ap);
+  klog_guard.init ("klog_guard")->acquire ();
+  if (!dev_kmsg)
+    dev_kmsg = (fhandler_mailslot *) build_fh_name ("/dev/kmsg");
+  if (dev_kmsg && !dev_kmsg->get_handle ())
+    dev_kmsg->open (O_WRONLY, 0);
+  if (dev_kmsg && dev_kmsg->get_handle ())
+    dev_kmsg->write (buf, strlen (buf) + 1);
+  else
+    vsyslog (priority, message, ap);
+  klog_guard.release ();
+}
+
+extern "C" void
+klog (int priority, const char *message, ...)
+{
+  va_list ap;
+  va_start (ap, message);
+  vklog (priority, message, ap);
+  va_end (ap);
+}
+
 extern "C" void
 closelog (void)
 {
-- 
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