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authorRob Landley <rob@landley.net>2010-01-06 05:29:53 -0600
committerRob Landley <rob@landley.net>2010-01-06 05:29:53 -0600
commit905060ab99df690356303f37387d95e788fa7d30 (patch)
tree0e7a1c092f7a1375ccc25a750409c87e4b8dbd32 /toys/nice.c
parentdb037ef6e0d7e84e5fd9ba831b55550a9b487257 (diff)
downloadtoybox-905060ab99df690356303f37387d95e788fa7d30.tar.gz
Add command "nice".
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+/* 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);
+}