[PATCH v2 12/15] selftests/nolibc: add common get_tmpfile()

[Zhangjin Wu <falcon@xxxxxxxxxxx>]

allow create and get a temporary file from tmpfs.

Signed-off-by: Zhangjin Wu <falcon@xxxxxxxxxxx>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 8e3e2792f5e3..1002e0267515 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -54,6 +54,23 @@ struct test {
 	int (*func)(int min, int max); /* handler */
 };
 
+static const char *get_tmpfile(const char *tmpfile)
+{
+	struct stat stat_buf;
+	int fd;
+
+	if (stat(tmpfile, &stat_buf) == 0)
+		return tmpfile;
+
+	fd = open(tmpfile, O_CREAT, 0600);
+	if (fd != -1) {
+		close(fd);
+		return tmpfile;
+	}
+
+	return NULL;
+}
+
 #ifndef _NOLIBC_STDLIB_H
 char *itoa(int i)
 {
-- 
2.25.1