linux-kernel - [PATCH v3 03/12] tools/nolibc/stdio: let perror work when NOLIBC_IGNORE

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Message-ID: <20250924142059.527768-4-benjamin@sipsolutions.net>
Date: Wed, 24 Sep 2025 16:20:50 +0200
From: Benjamin Berg <benjamin@...solutions.net>
To: linux-um@...ts.infradead.org,
	Willy Tarreau <w@....eu>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	linux-kselftest@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	Benjamin Berg <benjamin.berg@...el.com>
Subject: [PATCH v3 03/12] tools/nolibc/stdio: let perror work when NOLIBC_IGNORE_ERRNO is set

From: Benjamin Berg <benjamin.berg@...el.com>

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@...el.com>

---
v3:
- Change the message instead of removing perror entirely
---
 tools/include/nolibc/stdio.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index 7630234408c5..724d05ce6962 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -600,7 +600,11 @@ int sscanf(const char *str, const char *format, ...)
 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))
-- 
2.51.0