mirror of
https://github.com/topjohnwu/ndk-busybox.git
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56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* nice implementation for busybox
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*
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* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <sys/resource.h>
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#include "libbb.h"
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int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nice_main(int argc, char **argv)
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{
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int old_priority, adjustment;
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old_priority = getpriority(PRIO_PROCESS, 0);
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if (!*++argv) { /* No args, so (GNU) output current nice value. */
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printf("%d\n", old_priority);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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adjustment = 10; /* Set default adjustment. */
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if (argv[0][0] == '-') {
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if (argv[0][1] == 'n') { /* -n */
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if (argv[0][2]) { /* -nNNNN (w/o space) */
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argv[0] += 2; argv--; argc++;
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}
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} else { /* -NNN (NNN may be negative) == -n NNN */
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argv[0] += 1; argv--; argc++;
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}
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if (argc < 4) { /* Missing priority and/or utility! */
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bb_show_usage();
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}
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adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
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argv += 2;
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}
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{ /* Set our priority. */
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int prio = old_priority + adjustment;
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if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
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bb_perror_msg_and_die("setpriority(%d)", prio);
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}
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}
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BB_EXECVP(*argv, argv); /* Now exec the desired program. */
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/* The exec failed... */
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xfunc_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */
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bb_simple_perror_msg_and_die(*argv);
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}
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