tests: add SCHED_BATCH test

Reference: https://bugzilla.redhat.com/show_bug.cgi?id=741090
Acked-by:: Jaromir Capik <jcapik@redhat.com>
Acked-by:  Sami Kerola <kerolasa@iki.fi>
Signed-off-by: Mike Fleetwood <mike.fleetwood@googlemail.com>

testsuite/.gitignore

@@ -2,3 +2,4 @@
 *.sum
 site.bak
 site.exp
+test-schedbatch

testsuite/Makefile.am

@@ -4,6 +4,10 @@ export DEJAGNU
 # Programs that are expected across the board.
 DEJATOOL =
 
+noinst_PROGRAMS = test-schedbatch
+
+test_schedbatch_SOURCES = ps.test/test-schedbatch.c
+
 if LINUX
 # These should be in defined in 'across the board' scope, but are
 # temporarily disabled on other than linux systems, see commit
@@ -35,6 +39,7 @@ EXTRA_DIST = \
     pmap.test/pmap.exp \
     ps.test/ps_output.exp \
     ps.test/ps_personality.exp \
+    ps.test/ps_sched_batch.exp \
     pwdx.test/pwdx.exp \
     slabtop.test/slabtop.exp \
     sysctl.test/sysctl_read.exp \

testsuite/ps.test/ps_sched_batch.exp

@@ -0,0 +1,12 @@
+#
+# check the ps SCHED_BATCH scheduler policy output
+#
+set ps "${topdir}ps/pscommand"
+set schedbatch "${topdir}testsuite/test-schedbatch"
+
+spawn $schedbatch 18
+
+set test "ps SCHED_BATCH scheduler"
+spawn $ps --no-header -o comm,cls,nice -a
+expect_pass "$test" "\\s+test-schedbatch\\s+B\\s+18"
+untested "$test"

testsuite/ps.test/test-schedbatch.c

@@ -0,0 +1,39 @@
+/* test-schedbatch.c - Create a process using SCHED_BATCH scheduler
+ * policy and nice value.
+ * Compile: gcc -o test-schedbatch -Wall test-schedbatch.c
+ * Usage:   ./test-schedbatch [ <NICE> ]
+ *
+ * Author: Mike Fleetwood
+ * https://bugzilla.redhat.com/show_bug.cgi?id=741090
+ */
+
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sched.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+int main(int argc, const char *argv[])
+{
+	int nice = 19;
+	struct sched_param sp;
+	char msg[50];
+
+	if (argc >= 2) {
+		nice = atoi(argv[1]);
+	}
+	sp.sched_priority = 0;
+	if (sched_setscheduler(0, SCHED_BATCH, &sp)) {
+		perror("sched_setscheduler(0,SCHED_BATCH,{.sched_priority=0}");
+	}
+	if (setpriority(PRIO_PROCESS, 0, nice) || errno) {
+		(void)snprintf(msg, sizeof(msg),
+			       "setpriority(PRIO_PROCESS, 0, %d)", nice);
+		perror(msg);
+	}
+	while (1) {
+		getchar();
+	}
+}