tests: add umask.test

* tests/umask.c: New file.
* tests/umask.test: New test.
* tests/.gitignore: Add umask.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(TESTS): Add umask.test.

tests/.gitignore

@@ -121,6 +121,7 @@ uid
 uid16
 uid32
 uio
+umask
 umount
 umount2
 umovestr

tests/Makefile.am

@@ -169,6 +169,7 @@ check_PROGRAMS = \
 	uid16 \
 	uid32 \
 	uio \
+	umask \
 	umount \
 	umount2 \
 	umovestr \
@@ -325,6 +326,7 @@ TESTS = \
 	uid16.test \
 	uid32.test \
 	uio.test \
+	umask.test \
 	umount.test \
 	umount2.test \
 	umovestr.test \

tests/umask.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <sys/stat.h>
+
+int
+main(void)
+{
+	mode_t rc = umask(044);
+	printf("umask(%#o) = %#o\n", 044, rc);
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}

tests/umask.test

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# Check umask syscall decoding.
+
+. "${srcdir=.}/init.sh"
+
+run_prog > /dev/null
+OUT="$LOG.out"
+run_strace -eumask -a11 $args > "$OUT"
+match_diff "$LOG" "$OUT"
+rm -f "$OUT"