4 files changed, 161 insertions, 0 deletions
diff --git a/usr/src/test/os-tests/runfiles/default.run b/usr/src/test/os-tests/runfiles/default.run
index 72158c8bc2..f2f66ab4d7 100644
--- a/usr/src/test/os-tests/runfiles/default.run
+++ b/usr/src/test/os-tests/runfiles/default.run
@@ -76,6 +76,9 @@ user = root
 tests = ['conn', 'dgram', 'drop_priv', 'nosignal', 'rights.32', 'rights.64',
          'sockpair']
 
+[/opt/os-tests/tests/syscall]
+tests = ['open.32', 'open.64']
+
 [/opt/os-tests/tests/pf_key]
 user = root
 timeout = 180
diff --git a/usr/src/test/os-tests/tests/Makefile b/usr/src/test/os-tests/tests/Makefile
index 7396e135c9..190c61e134 100644
--- a/usr/src/test/os-tests/tests/Makefile
+++ b/usr/src/test/os-tests/tests/Makefile
@@ -29,6 +29,7 @@ SUBDIRS =       \
 		sockfs \
 		spoof-ras \
 		stress \
+		syscall \
 		timer \
 		tmpfs \
 		uccid \
diff --git a/usr/src/test/os-tests/tests/syscall/Makefile b/usr/src/test/os-tests/tests/syscall/Makefile
new file mode 100644
index 0000000000..b4ba83a18b
--- /dev/null
+++ b/usr/src/test/os-tests/tests/syscall/Makefile
@@ -0,0 +1,55 @@
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2020 Joyent, Inc.
+#
+
+include $(SRC)/cmd/Makefile.cmd
+include $(SRC)/test/Makefile.com
+
+PROGS = open
+
+CSTD = $(CSTD_GNU99)
+
+ROOTOPTPKG = $(ROOT)/opt/os-tests
+TESTDIR = $(ROOTOPTPKG)/tests/syscall
+
+PROGS32 = $(PROGS:%=%.32)
+PROGS64 = $(PROGS:%=%.64)
+CMDS = $(PROGS32) $(PROGS64)
+$(CMDS) := FILEMODE = 0555
+
+TESTDIRPROGS = $(PROGS32:%=$(TESTDIR)/%) \
+	$(PROGS64:%=$(TESTDIR)/%)
+
+all: $(PROGS32) $(PROGS64)
+
+install: all $(TESTDIR) $(TESTDIRPROGS)
+
+clobber: clean
+
+clean:
+	-$(RM) $(CMDS)
+
+$(TESTDIR):
+	$(INS.dir)
+
+$(TESTDIR)/%: %
+	$(INS.file)
+
+%.64: %.c
+	$(LINK64.c) -o $@ $< $(LDLIBS64)
+	$(POST_PROCESS)
+
+%.32: %.c
+	$(LINK.c) -o $@ $< $(LDLIBS)
+	$(POST_PROCESS)
diff --git a/usr/src/test/os-tests/tests/syscall/open.c b/usr/src/test/os-tests/tests/syscall/open.c
new file mode 100644
index 0000000000..e7f826b2a5
--- /dev/null
+++ b/usr/src/test/os-tests/tests/syscall/open.c
@@ -0,0 +1,102 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2020 Joyent, Inc.
+ */
+
+/*
+ * Test the open(2) syscall.
+ *
+ * Currently only tests O_DIRECT pass/fail based on the known support in the
+ * underlying file system.
+ *
+ * Note: there is a test for the O_DIRECTORY flag in the directory above this
+ * which could be consolidated into this code at some point.
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/param.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void
+o_direct_test(const char *dir)
+{
+	int fd;
+	struct statvfs64 buf;
+	char tmpname[MAXPATHLEN];
+	char *path;
+
+	boolean_t pass;
+
+	(void) snprintf(tmpname, sizeof (tmpname), "%s/otstXXXXXX", dir);
+	if ((path = mktemp(tmpname)) == NULL) {
+		(void) printf("FAILED: unable to create temp file name\n");
+		exit(1);
+	}
+
+	if (statvfs64(dir, &buf) == -1) {
+		perror("statvfs failed");
+		exit(1);
+	}
+
+	if (strcmp(buf.f_basetype, "zfs") == 0) {
+		pass = B_TRUE;
+	} else if (strcmp(buf.f_basetype, "tmpfs") == 0) {
+		pass = B_FALSE;
+	} else {
+		(void) printf("SKIP: expected 'zfs' or 'tmpfs'\n");
+		return;
+	}
+
+	fd = open(path, O_WRONLY | O_CREAT | O_EXCL | O_DIRECT, 0644);
+	if (fd >= 0) {
+		(void) close(fd);
+		(void) unlink(path);
+		if (!pass) {
+			(void) printf("FAILED: O_DIRECT on %s/tst_open is "
+			    "expected to fail\n", dir);
+			exit(1);
+		}
+	} else {
+		if (pass) {
+			(void) printf("FAILED: O_DIRECT on %s/tst_open is "
+			    "expected to succeed\n", dir);
+			exit(1);
+		}
+
+		if (errno != EINVAL) {
+			(void) printf("FAILED: expected EINVAL, got %d\n",
+			    errno);
+			exit(1);
+		}
+	}
+}
+
+int
+main(void)
+{
+	/* On typical illumos distros, /tmp is tmpfs, O_DIRECT should fail */
+	o_direct_test("/tmp");
+
+	/* On typical illumos distros, /var is zfs, O_DIRECT should pass */
+	o_direct_test("/var/tmp");
+
+	(void) printf("PASS\n");
+	return (0);
+}