mirror of
git://git.sv.gnu.org/coreutils
synced 2026-06-08 00:28:56 -04:00
Jim Meyering
152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
/* nice -- run a program with modified scheduling priority
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Copyright (C) 1990, 1991 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* David MacKenzie <djm@ai.mit.edu> */
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#include <stdio.h>
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#include <getopt.h>
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#include <sys/types.h>
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#ifndef NICE_PRIORITY
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#include <sys/time.h>
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#include <sys/resource.h>
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#endif
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#include "system.h"
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void error ();
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static int isinteger ();
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static void usage ();
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/* The name this program was run with. */
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char *program_name;
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static struct option const longopts[] =
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{
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{"adjustment", 1, NULL, 'n'},
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{NULL, 0, NULL, 0}
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};
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void
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main (argc, argv)
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int argc;
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char **argv;
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{
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int current_priority;
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int adjustment = 0;
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int minusflag = 0;
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int adjustment_given = 0;
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int optc;
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program_name = argv[0];
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while ((optc = getopt_long (argc, argv, "+0123456789-n:", longopts,
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(int *) 0)) != EOF)
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{
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switch (optc)
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{
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case '?':
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usage ();
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case 'n':
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if (!isinteger (optarg))
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error (1, 0, "invalid priority `%s'", optarg);
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adjustment = atoi (optarg);
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adjustment_given = 1;
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break;
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case '-':
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minusflag = 1;
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break;
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default:
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adjustment = adjustment * 10 + optc - '0';
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adjustment_given = 1;
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}
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}
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if (minusflag)
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adjustment = -adjustment;
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if (!adjustment_given)
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adjustment = 10;
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if (optind == argc)
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{
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if (adjustment_given)
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usage ();
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/* No command given; print the priority. */
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errno = 0;
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#ifndef NICE_PRIORITY
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current_priority = getpriority (PRIO_PROCESS, 0);
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#else
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current_priority = nice (0);
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#endif
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if (current_priority == -1 && errno != 0)
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error (1, errno, "cannot get priority");
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printf ("%d\n", current_priority);
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exit (0);
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}
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errno = 0;
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#ifndef NICE_PRIORITY
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current_priority = getpriority (PRIO_PROCESS, 0);
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#else
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current_priority = nice (0);
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#endif
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if (current_priority == -1 && errno != 0)
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error (1, errno, "cannot get priority");
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#ifndef NICE_PRIORITY
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if (setpriority (PRIO_PROCESS, 0, current_priority + adjustment))
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#else
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if (nice (adjustment) == -1)
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#endif
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error (1, errno, "cannot set priority");
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execvp (argv[optind], &argv[optind]);
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error (errno == ENOENT ? 127 : 126, errno, "%s", argv[optind]);
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}
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/* Return nonzero if S represents a (possibly signed) decimal integer,
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zero if not. */
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static int
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isinteger (s)
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char *s;
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{
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if (*s == '-')
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++s;
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if (*s == 0)
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return 0;
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while (*s)
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{
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if (*s < '0' || *s > '9')
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return 0;
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++s;
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}
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return 1;
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}
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static void
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usage ()
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{
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fprintf (stderr, "\
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Usage: %s [-n adjustment] [-adjustment] [--adjustment=adjustment]\n\
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[command [arg...]]\n",
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program_name);
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exit (1);
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}
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