1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
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);
}
|
