From 905060ab99df690356303f37387d95e788fa7d30 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Wed, 6 Jan 2010 05:29:53 -0600 Subject: Add command "nice". --- toys/nice.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 toys/nice.c (limited to 'toys/nice.c') diff --git a/toys/nice.c b/toys/nice.c new file mode 100644 index 00000000..2fda2675 --- /dev/null +++ b/toys/nice.c @@ -0,0 +1,44 @@ +/* vi: set sw=4 ts=4: + * + * nice.c - Run a program at a different niceness level. + * + * Copyright 2010 Rob Landley + * + * See http://www.opengroup.org/onlinepubs/9699919799/utilities/nice.html + +USE_NICE(NEWTOY(nice, "^<1n#", TOYFLAG_USR|TOYFLAG_BIN)) + +config NICE + bool "nice" + default y + help + usage: nice [-n PRIORITY] command [args...] + + Run a command line at an increased or decreased scheduling priority. + + Higher numbers make a program yield more CPU time, from 20 (lowest + priority) to -19 (highest). By default processes inherit their parent's + niceness (usually 0). By default this command adds 10 to the parent's + priority. Only root can set a negative niceness level. +*/ + +#include "toys.h" + +// Hello doesn't use these globals, they're here for example/skeleton purposes. + +DEFINE_GLOBALS( + long priority; +) + +#define TT this.nice + +void nice_main(void) +{ + if (!toys.optflags) TT.priority = 10; + + nice(TT.priority); + if (getpriority(PRIO_PROCESS, getpid()) != TT.priority) + perror_exit("Can't set priority"); + + xexec(toys.optargs); +} -- cgit v1.2.3