summaryrefslogtreecommitdiff
path: root/posix/getconf.c
blob: 7423a7722505b41c5d0ef295fcf1046dea4ec4e7 (plain)
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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.

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., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

struct conf
  {
    CONST char *name;
    CONST int call_name;
    CONST enum { SYSCONF, CONFSTR, PATHCONF } call;
  };

static struct conf vars[] =
  {
    { "LINK_MAX", _PC_LINK_MAX, PATHCONF },
    { "MAX_CANON", _PC_MAX_CANON, PATHCONF },
    { "MAX_INPUT", _PC_MAX_INPUT, PATHCONF },
    { "NAME_MAX", _PC_NAME_MAX, PATHCONF },
    { "PATH_MAX", _PC_PATH_MAX, PATHCONF },
    { "PIPE_BUF", _PC_PIPE_BUF, PATHCONF },
    { "_POSIX_CHOWN_RESTRICTED", _PC_CHOWN_RESTRICTED, PATHCONF },
    { "_POSIX_NO_TRUNC", _PC_NO_TRUNC, PATHCONF },
    { "_POSIX_VDISABLE", _PC_VDISABLE, PATHCONF },

    { "ARG_MAX", _SC_ARG_MAX, SYSCONF },
    { "CHILD_MAX", _SC_CHILD_MAX, SYSCONF },
    { "CLK_TCK", _SC_CLK_TCK, SYSCONF },
    { "NGROUPS_MAX", _SC_NGROUPS_MAX, SYSCONF },
    { "OPEN_MAX", _SC_OPEN_MAX, SYSCONF },
    { "_POSIX_JOB_CONTROL", _SC_JOB_CONTROL, SYSCONF },
    { "_POSIX_SAVED_IDS", _SC_SAVED_IDS, SYSCONF },
    { "_POSIX_VERSION", _SC_VERSION, SYSCONF },

    { "PATH", _CS_PATH, CONFSTR },

    { NULL, 0, SYSCONF }
  };

static CONST char *program;

static void
DEFUN_VOID(usage)
{
  fprintf (stderr, _("Usage: %s variable_name [pathname]\n"), program);
  exit (2);
}

int
DEFUN(main, (argc, argv), int argc AND char **argv)
{
  register CONST struct conf *c;

  program = strrchr (argv[0], '/');
  if (program == NULL)
    program = argv[0];
  else
    ++program;

  if (argc < 2 || argc > 3)
    usage ();

  for (c = vars; c->name != NULL; ++c)
    if (!strcmp (c->name, argv[1]))
      {
	long int value;
	size_t clen;
	char *cvalue;
	switch (c->call)
	  {
	  case PATHCONF:
	    if (argc < 3)
	      usage ();
	    value = pathconf (argv[2], c->call_name);
	    if (value == -1)
	      {
		fprintf (stderr, "%s: pathconf: %s: %s\n",
			 program, argv[2], strerror (errno));
		exit (3);
	      }
	    printf ("%ld\n", value);
	    exit (0);

	  case SYSCONF:
	    if (argc > 2)
	      usage ();
	    value = sysconf (c->call_name);
	    printf ("%ld\n", value);
	    exit (0);

	  case CONFSTR:
	    if (argc > 2)
	      usage ();
	    clen = confstr (c->call_name, (char *) NULL, 0);
	    cvalue = (char *) malloc (clen);
	    if (cvalue == NULL)
	      {
		fprintf (stderr, "%s: malloc: %s\n",
			 program, strerror (errno));
		exit (3);
	      }
	    if (confstr (c->call_name, cvalue, clen) != clen)
	      {
		fprintf (stderr, "%s: confstr: %s\n",
			 program, strerror (errno));
		exit (3);
	      }
	    printf ("%.*s\n", (int) clen, cvalue);
	    exit (0);
	  }
      }

  fprintf (stderr, _("%s: Unrecognized variable `%s'\n"), program, argv[1]);
  exit (2);
}