*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config NICE
+//config: bool "nice (1.8 kb)"
+//config: default y
+//config: help
+//config: nice runs a program with modified scheduling priority.
+
+//applet:IF_NICE(APPLET_NOEXEC(nice, nice, BB_DIR_BIN, BB_SUID_DROP, nice))
+
+//kbuild:lib-$(CONFIG_NICE) += nice.o
+
+//usage:#define nice_trivial_usage
+//usage: "[-n ADJUST] [PROG ARGS]"
+//usage:#define nice_full_usage "\n\n"
+//usage: "Change scheduling priority, run PROG\n"
+//usage: "\n -n ADJUST Adjust priority by ADJUST"
-#include <sys/resource.h>
#include "libbb.h"
int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int nice_main(int argc, char **argv)
+int nice_main(int argc UNUSED_PARAM, char **argv)
{
int old_priority, adjustment;
old_priority = getpriority(PRIO_PROCESS, 0);
- if (!*++argv) { /* No args, so (GNU) output current nice value. */
+ 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. */
+ 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++;
+ char *nnn = argv[0] + 1;
+ if (nnn[0] == 'n') { /* -n */
+ nnn += 1;
+ if (!nnn[0]) { /* "-n NNN" */
+ nnn = *++argv;
}
- } else { /* -NNN (NNN may be negative) == -n NNN */
- argv[0] += 1; argv--; argc++;
+ /* else: "-nNNN" (w/o space) */
}
- if (argc < 4) { /* Missing priority and/or utility! */
+ /* else: "-NNN" (NNN may be negative) - same as "-n NNN" */
+
+ if (!nnn || !argv[1]) { /* Missing priority or PROG! */
bb_show_usage();
}
- adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
- argv += 2;
+ adjustment = xatoi_range(nnn, INT_MIN/2, INT_MAX/2);
+ argv++;
}
{ /* Set our priority. */