selftests/nolibc: export argv0 for some tests

argv0 is the path to nolibc-test program itself, which is a very good
always existing readable file for some tests, let's export it.

Note, the path may be absolute or relative, please make sure the tests
work with both of them. If it is relative, we must make sure the current
path is the one specified by the PWD environment variable.

Suggested-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/lkml/ZKKbS3cwKcHgnGwu@1wt.eu/
Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index c02d89953679c020c9c229c043e1a002cb5f6dce..1e4a39548f2665848343e63c7203d6657a08d94b 100644 (file)
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -43,6 +43,9 @@
 /* will be used by nolibc by getenv() */
 char **environ;
 
+/* will be used by some test cases as readable file, please don't write it */
+static const char *argv0;
+
 /* definition of a series of tests */
 struct test {
        const char *name;              /* test name */
@@ -948,6 +951,7 @@ int main(int argc, char **argv, char **envp)
        int idx;
        char *test;
 
+       argv0 = argv[0];
        environ = envp;
 
        /* when called as init, it's possible that no console was opened, for