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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /posix/getconf.c
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initial import
Diffstat (limited to 'posix/getconf.c')
-rw-r--r--posix/getconf.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/posix/getconf.c b/posix/getconf.c
new file mode 100644
index 0000000..e42b909
--- /dev/null
+++ b/posix/getconf.c
@@ -0,0 +1,134 @@
+/* Copyright (C) 1991, 1992 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);
+}