From e42165177d89340a106de023bd4c9d5cf918f9ce Mon Sep 17 00:00:00 2001
From: Miles Bader <miles@gnu.org>
Date: Thu, 11 Apr 1996 00:08:02 +0000
Subject: Initial revision

---
 utils/devprobe.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 utils/devprobe.c

diff --git a/utils/devprobe.c b/utils/devprobe.c
new file mode 100644
index 00000000..558ed717
--- /dev/null
+++ b/utils/devprobe.c
@@ -0,0 +1,104 @@
+/* Check the existence of mach devices
+
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <stdio.h>
+#include <argp.h>
+#include <error.h>
+
+#include <hurd.h>
+#include <mach.h>
+#include <device/device.h>
+
+static const struct argp_option options[] = {
+  {"silent", 's', 0, 0, "Don't print devices found"},
+  {"quiet", 0, 0, OPTION_ALIAS},
+  {"first", 'f', 0, 0, "Stop after the first device found"},
+  {0}
+};
+static const char *args_doc = "DEVNAME...";
+static const char *doc = "The exit status is 0 if any devices were found.";
+
+int
+main (int argc, char **argv)
+{
+  error_t err;
+  mach_port_t device_master;
+  /* Print devices found?  (otherwise only exit status matters)  */
+  int print = 1;
+  /* If printing, print all devices on the command line that are found. 
+     Otherwise, just the first one found is printed.  */
+  int all = 1;
+  int found_one = 0;
+
+  /* Parse our options...  */
+  error_t parse_opt (int key, char *arg, struct argp_state *state)
+    {
+      switch (key)
+	{
+	  error_t err;
+	  device_t device;  
+
+	case 's': case 'q':
+	  /* Don't print any output.  Since our exit status only reflects
+	     whether any one of the devices exists, there's no point in
+	     probing past the first one.  */
+	  print = all = 0; break;
+
+	case 'f':
+	  all = 0; break;
+
+	case ARGP_KEY_ARG:
+	  err = device_open (device_master, 0, arg, &device);
+	  if (err == 0)
+	    /* Got it.  */
+	    {
+	      /* Free the device port we got.  */
+	      mach_port_deallocate (mach_task_self (), device);
+
+	      if (print)
+		puts (arg);
+
+	      if (! all)
+		/* Only care about the first device found, so declare success
+		   and...  */
+		exit (0);
+
+	      found_one = 1;
+	    }
+	  else if (err != ED_NO_SUCH_DEVICE)
+	    /* Complain about unexpected errors.  */
+	    error (0, err, "%s", arg);
+	  break;
+
+	default: return EINVAL;
+	}
+      return 0;
+    }
+  const struct argp argp = { options, parse_opt, args_doc, doc };
+
+  err = get_privileged_ports (0, &device_master);
+  if (err)
+    error (3, err, "Can't get device master port");
+
+  /* Parse our arguments.  */
+  argp_parse (&argp, argc, argv, 0, 0, 0);
+
+  exit (found_one ? 0 : 1);
+}
-- 
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