tools/nolibc/stdio: let perror work when NOLIBC_IGNORE_ERRNO is set

[ Upstream commit c485ca3aff2442adea4c08ceb5183e671ebed22a ]

There is no errno variable when NOLIBC_IGNORE_ERRNO is defined. As such,
simply print the message with "unknown error" rather than the integer
value of errno.

Fixes: acab7bcdb1bc ("tools/nolibc/stdio: add perror() to report the errno value")
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index c968dbbc4ef8137e237b859bf18a6d2970230cbf..4749a32b3064b5c6433852f88db7aa5d3d5dd18a 100644 (file)
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -351,7 +351,11 @@ int printf(const char *fmt, ...)
 static __attribute__((unused))
 void perror(const char *msg)
 {
+#ifdef NOLIBC_IGNORE_ERRNO
+       fprintf(stderr, "%s%sunknown error\n", (msg && *msg) ? msg : "", (msg && *msg) ? ": " : "");
+#else
        fprintf(stderr, "%s%serrno=%d\n", (msg && *msg) ? msg : "", (msg && *msg) ? ": " : "", errno);
+#endif
 }
 
 static __attribute__((unused))