Add command "nice".

diff --git a/toys/nice.c b/toys/nice.c
new file mode 100644 (file)
index 0000000..2fda267
--- /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 <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);
+}