Mercurial > hg > toybox
annotate toys/nice.c @ 562:4d802d438983
Match uint64_t with PRIu64 to avoid warnings on 64 bit builds.
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Sat, 14 Apr 2012 21:27:00 -0500 |
| parents | b51faa4fe8e6 |
| children | 2364ace48ab1 |
| rev | line source |
|---|---|
| 374 | 1 /* vi: set sw=4 ts=4: |
| 2 * | |
| 3 * nice.c - Run a program at a different niceness level. | |
| 4 * | |
| 5 * Copyright 2010 Rob Landley <rob@landley.net> | |
| 6 * | |
| 7 * See http://www.opengroup.org/onlinepubs/9699919799/utilities/nice.html | |
| 8 | |
| 9 USE_NICE(NEWTOY(nice, "^<1n#", TOYFLAG_USR|TOYFLAG_BIN)) | |
| 10 | |
| 11 config NICE | |
| 12 bool "nice" | |
| 13 default y | |
| 14 help | |
| 15 usage: nice [-n PRIORITY] command [args...] | |
| 16 | |
| 17 Run a command line at an increased or decreased scheduling priority. | |
| 18 | |
|
446
b51faa4fe8e6
Correct description of nice levels in help of nice
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
444
diff
changeset
|
19 Higher numbers make a program yield more CPU time, from -20 (highest |
|
b51faa4fe8e6
Correct description of nice levels in help of nice
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
444
diff
changeset
|
20 priority) to 19 (lowest). By default processes inherit their parent's |
| 374 | 21 niceness (usually 0). By default this command adds 10 to the parent's |
| 22 priority. Only root can set a negative niceness level. | |
| 23 */ | |
| 24 | |
| 25 #include "toys.h" | |
| 26 | |
| 27 DEFINE_GLOBALS( | |
| 28 long priority; | |
| 29 ) | |
| 30 | |
| 31 #define TT this.nice | |
| 32 | |
| 33 void nice_main(void) | |
| 34 { | |
| 35 if (!toys.optflags) TT.priority = 10; | |
| 36 | |
| 37 nice(TT.priority); | |
| 38 if (getpriority(PRIO_PROCESS, getpid()) != TT.priority) | |
| 39 perror_exit("Can't set priority"); | |
| 40 | |
| 41 xexec(toys.optargs); | |
| 42 } |