t_truncate_self: describe self better in error message

Include the name of the program that is trying to trucate itself
to error messages to distinguish between output for different
test cases (e.g. test_lower and test_upper in overlay/013).

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

diff --git a/src/t_truncate_self.c b/src/t_truncate_self.c
index d14dec397e5f650d9667418305bc31452c92fd11..3f1c8e6fde8072e3699c4013383d30fa9bbaf71f 100644 (file)
--- a/src/t_truncate_self.c
+++ b/src/t_truncate_self.c
@@ -1,18 +1,21 @@
 #include <stdio.h>
 #include <errno.h>
 #include <unistd.h>
+#include <libgen.h>
 
 int main(int argc, char *argv[])
 {
+       const char *progname = basename(argv[0]);
        int ret;
 
        ret = truncate(argv[0], 4096);
        if (ret != -1) {
-               fprintf(stderr, "truncate(argv[0]) should have failed\n");
+               fprintf(stderr, "truncate(%s) should have failed\n",
+                       progname);
                return 1;
        }
        if (errno != ETXTBSY) {
-               perror("truncate(argv[0])");
+               perror(progname);
                return 1;
        }