/* 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 source tree. */ //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 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_or_die(argv); }