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/* nice -- run a program with modified scheduling priority
Copyright (C) 1990-2005 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* David MacKenzie <djm@gnu.ai.mit.edu> */
#include <config.h>
#include <stdio.h>
#include <assert.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#ifndef NICE_PRIORITY
/* Include this after "system.h" so we're sure to have definitions
(from time.h or sys/time.h) required for e.g. the ru_utime member. */
# include <sys/resource.h>
#endif
#include "error.h"
#include "long-options.h"
#include "posixver.h"
#include "xstrtol.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "nice"
#define AUTHORS "David MacKenzie"
#ifdef NICE_PRIORITY
# define GET_NICE_VALUE() nice (0)
#else
# define GET_NICE_VALUE() getpriority (PRIO_PROCESS, 0)
#endif
#ifndef NZERO
# define NZERO 20
#endif
/* This is required for Darwin Kernel Version 7.7.0. */
#if NZERO == 0
# undef NZERO
# define NZERO 20
#endif
/* The name this program was run with. */
char *program_name;
static struct option const longopts[] =
{
{"adjustment", required_argument, NULL, 'n'},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION] [COMMAND [ARG]...]\n"), program_name);
printf (_("\
Run COMMAND with an adjusted nice value, which affects the scheduling priority.\n\
With no COMMAND, print the current nice value. Nice values range from\n\
%d (most favorable scheduling) to %d (least favorable).\n\
\n\
-n, --adjustment=N add integer N to the nice value (default 10)\n\
"),
- NZERO, NZERO - 1);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
}
exit (status);
}
int
main (int argc, char **argv)
{
int current_nice_value;
int adjustment = 10;
char const *adjustment_given = NULL;
bool ok;
int i;
initialize_main (&argc, &argv);
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
initialize_exit_failure (EXIT_FAIL);
atexit (close_stdout);
parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
usage, AUTHORS, (char const *) NULL);
for (i = 1; i < argc; /* empty */)
{
char *s = argv[i];
if (s[0] == '-' && ISDIGIT (s[1 + (s[1] == '-' || s[1] == '+')])
&& posix2_version () < 200112)
{
adjustment_given = s + 1;
++i;
}
else
{
int optc;
char **fake_argv = argv + i - 1;
/* Initialize getopt_long's internal state. */
optind = 0;
if ((optc = getopt_long (argc - (i - 1), fake_argv, "+n:",
longopts, NULL)) != -1)
{
switch (optc)
{
case '?':
usage (EXIT_FAIL);
case 'n':
adjustment_given = optarg;
break;
}
}
i += optind - 1;
if (optc == EOF)
break;
}
}
if (adjustment_given)
{
/* If the requested adjustment is outside the valid range,
silently bring it to just within range; this mimics what
"setpriority" and "nice" do. */
enum { MIN_ADJUSTMENT = 1 - 2 * NZERO, MAX_ADJUSTMENT = 2 * NZERO - 1 };
long int tmp;
if (LONGINT_OVERFLOW < xstrtol (adjustment_given, NULL, 10, &tmp, ""))
error (EXIT_FAIL, 0, _("invalid adjustment `%s'"), adjustment_given);
adjustment = MAX (MIN_ADJUSTMENT, MIN (tmp, MAX_ADJUSTMENT));
}
if (i == argc)
{
if (adjustment_given)
{
error (0, 0, _("a command must be given with an adjustment"));
usage (EXIT_FAIL);
}
/* No command given; print the nice value. */
errno = 0;
current_nice_value = GET_NICE_VALUE ();
if (current_nice_value == -1 && errno != 0)
error (EXIT_FAIL, errno, _("cannot get priority"));
printf ("%d\n", current_nice_value);
exit (EXIT_SUCCESS);
}
#ifndef NICE_PRIORITY
errno = 0;
current_nice_value = GET_NICE_VALUE ();
if (current_nice_value == -1 && errno != 0)
error (EXIT_FAIL, errno, _("cannot get priority"));
ok = (setpriority (PRIO_PROCESS, 0, current_nice_value + adjustment) == 0);
#else
errno = 0;
ok = (nice (adjustment) != -1 || errno == 0);
#endif
if (!ok)
error (errno == EPERM ? 0 : EXIT_FAIL, errno, _("cannot set priority"));
execvp (argv[i], &argv[i]);
{
int exit_status = (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
error (0, errno, "%s", argv[i]);
exit (exit_status);
}
}
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