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1 /* vi: set sw=4 ts=4:
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2 *
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3 * nice.c - Run a program at a different niceness level.
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4 *
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5 * Copyright 2010 Rob Landley <rob@landley.net>
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6 *
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7 * See http://www.opengroup.org/onlinepubs/9699919799/utilities/nice.html
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8
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9 USE_NICE(NEWTOY(nice, "^<1n#", TOYFLAG_USR|TOYFLAG_BIN))
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10
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11 config NICE
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12 bool "nice"
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13 default y
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14 help
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15 usage: nice [-n PRIORITY] command [args...]
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16
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17 Run a command line at an increased or decreased scheduling priority.
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18
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19 Higher numbers make a program yield more CPU time, from 20 (lowest
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20 priority) to -19 (highest). By default processes inherit their parent's
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21 niceness (usually 0). By default this command adds 10 to the parent's
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22 priority. Only root can set a negative niceness level.
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23 */
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24
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25 #include "toys.h"
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26
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27 // Hello doesn't use these globals, they're here for example/skeleton purposes.
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28
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29 DEFINE_GLOBALS(
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30 long priority;
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31 )
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32
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33 #define TT this.nice
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34
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35 void nice_main(void)
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36 {
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37 if (!toys.optflags) TT.priority = 10;
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38
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39 nice(TT.priority);
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40 if (getpriority(PRIO_PROCESS, getpid()) != TT.priority)
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41 perror_exit("Can't set priority");
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42
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43 xexec(toys.optargs);
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44 }
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