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/* nice -- run a program with modified scheduling priority
Copyright (C) 90, 91, 92, 93, 1994 Free Software Foundation, Inc.
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. */
/* David MacKenzie <djm@gnu.ai.mit.edu> */
#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
(which it would do because it found this file in $srcdir). */
#include <config.h>
#else
#include "config.h"
#endif
#endif
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#ifndef NICE_PRIORITY
#include <sys/time.h>
#include <sys/resource.h>
#endif
#include "version.h"
#include "system.h"
#ifdef NICE_PRIORITY
#define GET_PRIORITY() nice (0)
#else
#define GET_PRIORITY() getpriority (PRIO_PROCESS, 0)
#endif
void error ();
static int isinteger ();
static void usage ();
/* The name this program was run with. */
char *program_name;
/* If non-zero, display usage information and exit. */
static int show_help;
/* If non-zero, print the version on standard output and exit. */
static int show_version;
static struct option const longopts[] =
{
{"adjustment", required_argument, NULL, 'n'},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
void
main (argc, argv)
int argc;
char **argv;
{
int current_priority;
int adjustment = 0;
int minusflag = 0;
int adjustment_given = 0;
int optc;
program_name = argv[0];
/* Inhibit the error message getopt would otherwise give for
unrecognized options. */
opterr = 0;
while ((optc = getopt_long (argc, argv, "+0123456789-n:", longopts,
(int *) 0)) != EOF)
{
char *s;
switch (optc)
{
case '?':
/* Determine whether this is an option like `--5'.
If so, treat it like `-n -5'. */
s = argv[optind - 1];
/* Make sure s[1..] is a valid negative integer.
Test/convert `s+1' rather than `s+2' so we reject options
like `---5' as unrecognized. */
if (s[1] == '-' && isinteger (s + 1))
{
adjustment = atoi (s + 1);
adjustment_given = 1;
}
else
{
error (0, 0, "unrecognized option `%s'", s);
usage (1);
}
break;
case 0:
break;
case 'n':
if (!isinteger (optarg))
error (1, 0, "invalid priority `%s'", optarg);
adjustment = atoi (optarg);
adjustment_given = 1;
break;
case '-':
minusflag = 1;
break;
default:
adjustment = adjustment * 10 + optc - '0';
adjustment_given = 1;
}
}
if (show_version)
{
printf ("nice - %s\n", version_string);
exit (0);
}
if (show_help)
usage (0);
if (minusflag)
adjustment = -adjustment;
if (!adjustment_given)
adjustment = 10;
if (optind == argc)
{
if (adjustment_given)
{
error (0, 0, "a command must be given with an adjustment");
usage (1);
}
/* No command given; print the priority. */
errno = 0;
current_priority = GET_PRIORITY ();
if (current_priority == -1 && errno != 0)
error (1, errno, "cannot get priority");
printf ("%d\n", current_priority);
exit (0);
}
#ifndef NICE_PRIORITY
errno = 0;
current_priority = GET_PRIORITY ();
if (current_priority == -1 && errno != 0)
error (1, errno, "cannot get priority");
if (setpriority (PRIO_PROCESS, 0, current_priority + adjustment))
#else
if (nice (adjustment) == -1)
#endif
error (1, errno, "cannot set priority");
execvp (argv[optind], &argv[optind]);
error (errno == ENOENT ? 127 : 126, errno, "%s", argv[optind]);
}
/* Return nonzero if S represents a (possibly signed) decimal integer,
zero if not. */
static int
isinteger (s)
char *s;
{
if (*s == '-' || *s == '+')
++s;
if (*s == 0)
return 0;
while (*s)
{
if (*s < '0' || *s > '9')
return 0;
++s;
}
return 1;
}
static void
usage (status)
int status;
{
if (status != 0)
fprintf (stderr, "Try `%s --help' for more information.\n",
program_name);
else
{
printf ("Usage: %s [OPTION]... [COMMAND [ARG]...]\n", program_name);
printf ("\
\n\
-ADJUST increment priority by ADJUST first\n\
-n, --adjustment=ADJUST same as -ADJUST\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
With no COMMAND, print the current scheduling priority. ADJUST is 10\n\
by default. Range goes from -20 (highest priority) to 19 (lowest).\n\
");
}
exit (status);
}
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