busybox/coreutils/nice.c

/* vi: set sw=4 ts=4: */
/*
 * nice implementation for busybox
 *
 * Copyright (C) 2005  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <sys/resource.h>
#include "busybox.h"

int nice_main(int argc, char **argv)
{
	int old_priority, adjustment;

	old_priority = getpriority(PRIO_PROCESS, 0);

	if (!*++argv) {	/* No args, so (GNU) output current nice value. */
		printf("%d\n", old_priority);
		fflush_stdout_and_exit(EXIT_SUCCESS);
	}

	adjustment = 10;			/* Set default adjustment. */

	if (argv[0][0] == '-') {
		if (argv[0][1] == 'n') { /* -n */
			if (argv[0][2]) { /* -nNNNN (w/o space) */
				argv[0] += 2; argv--; argc++;
			}
		} else { /* -NNN (NNN may be negative) == -n NNN */
			argv[0] += 1; argv--; argc++;
		}
		if (argc < 4) {			/* Missing priority and/or utility! */
			bb_show_usage();
		}
		adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
		argv += 2;
	}

	{  /* Set our priority. */
		int prio = old_priority + adjustment;

		if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
			bb_perror_msg_and_die("setpriority(%d)", prio);
		}
	}

	execvp(*argv, argv);		/* Now exec the desired program. */

	/* The exec failed... */
	xfunc_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */
	bb_perror_msg_and_die("%s", *argv);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* nice implementation for busybox
4	*
5	* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8	*/
9
10	#include <sys/resource.h>
11	#include "busybox.h"
12
13	int nice_main(int argc, char **argv)
14	{
15	int old_priority, adjustment;
16
17	old_priority = getpriority(PRIO_PROCESS, 0);
18
19	if (!++argv) { / No args, so (GNU) output current nice value. */
20	printf("%d\n", old_priority);
21	fflush_stdout_and_exit(EXIT_SUCCESS);
22	}
23
24	adjustment = 10; /* Set default adjustment. */
25
26	if (argv[0][0] == '-') {
27	if (argv[0][1] == 'n') { /* -n */
28	if (argv[0][2]) { /* -nNNNN (w/o space) */
29	argv[0] += 2; argv--; argc++;
30	}
31	} else { /* -NNN (NNN may be negative) == -n NNN */
32	argv[0] += 1; argv--; argc++;
33	}
34	if (argc < 4) { /* Missing priority and/or utility! */
35	bb_show_usage();
36	}
37	adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
38	argv += 2;
39	}
40
41	{ /* Set our priority. */
42	int prio = old_priority + adjustment;
43
44	if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
45	bb_perror_msg_and_die("setpriority(%d)", prio);
46	}
47	}
48
49	execvp(argv, argv); / Now exec the desired program. */
50
51	/* The exec failed... */
52	xfunc_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */
53	bb_perror_msg_and_die("%s", *argv);
54	}