Mercurial > hg > toybox
changeset 374:633a5bf9509d
Add command "nice".
author | Rob Landley <rob@landley.net> |
---|---|
date | Wed, 06 Jan 2010 05:29:53 -0600 |
parents | 5e68c7cab1a4 |
children | 9f4e5e15597c |
files | toys/nice.c |
diffstat | 1 files changed, 44 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toys/nice.c Wed Jan 06 05:29:53 2010 -0600 @@ -0,0 +1,44 @@ +/* vi: set sw=4 ts=4: + * + * nice.c - Run a program at a different niceness level. + * + * Copyright 2010 Rob Landley <rob@landley.net> + * + * 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); +}