mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-02 00:36:20 +00:00
56 lines
1.3 KiB
C
56 lines
1.3 KiB
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 "libbb.h"
|
|
|
|
int nice_main(int argc, char **argv);
|
|
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);
|
|
}
|
|
}
|
|
|
|
BB_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);
|
|
}
|