Nice(3) implementation

lib/posix/Makefile.in

@@ -102,6 +102,7 @@ libc_FILES=" \
 	getloadavg.c \
 	getopt.c \
 	gettimeofday.c \
+	nice.c \
 	priority.c \
 	usleep.c"
 

lib/posix/nice.c

@@ -0,0 +1,19 @@
+/*
+nice.c
+*/
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/resource.h>
+
+int nice(incr)
+int incr;
+{
+	int r;
+
+	errno= 0;
+	r= getpriority(PRIO_PROCESS, 0);
+	if (r == -1 && errno != 0)
+		return r;
+	return setpriority(PRIO_PROCESS, 0, r+incr);
+}