[hurd] 10/10: Make devprobe able to talk with userland drivers

[Samuel Thibault]

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sthibault pushed a commit to branch upstream
in repository hurd.

commit 83fef6c8958377258a764702ddda85f29ba6f3af
Author: Samuel Thibault <address@hidden>
Date:   Tue Nov 7 02:29:55 2017 +0100

    Make devprobe able to talk with userland drivers
    
    * utils/devprobe.c: Include <fcntl.h>
    (options): Add "master-device" ('M') option.
    (main): Handle 'M' option by opening the given filename for
    `device_master'.
---
 utils/devprobe.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/utils/devprobe.c b/utils/devprobe.c
index d702032..69b15b2 100644
--- a/utils/devprobe.c
+++ b/utils/devprobe.c
@@ -19,6 +19,7 @@
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
 #include <stdio.h>
+#include <fcntl.h>
 #include <argp.h>
 
 #include <hurd.h>
@@ -32,6 +33,7 @@ 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"},
+  {"master-device", 'M', "FILE", 0, "Get a pseudo master device port"},
   {0}
 };
 static const char *args_doc = "DEVNAME...";
@@ -66,6 +68,17 @@ main (int argc, char **argv)
        case 'f':
          all = 0; break;
 
+       case 'M':
+         if (device_master != MACH_PORT_NULL)
+           mach_port_deallocate (mach_task_self (), device_master);
+
+         device_master = file_name_lookup (arg, O_READ | O_WRITE, 0);
+         if (device_master == MACH_PORT_NULL)
+           argp_failure (state, 3, errno, "Can't open device master port %s",
+                         arg);
+
+         break;
+
        case ARGP_KEY_ARG:
          if (device_master == MACH_PORT_NULL)
            {

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