linux-kernel - [PATCH nolibc 23/61] tools/nolibc/stdio: add perror() to report the errno value

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Date:   Mon, 18 Apr 2022 17:41:47 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     gwml@...r.gnuweeb.org, kernel-team@...com, w@....eu,
        Willy Tarreau <w@....eu>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH nolibc 23/61] tools/nolibc/stdio: add perror() to report the errno value

From: Willy Tarreau <w@....eu>

It doesn't contain the text for the error codes, but instead displays
"errno=" followed by the errno value. Just like the regular errno, if
a non-empty message is passed, it's placed followed with ": " on the
output before the errno code. The message is emitted on stderr.

Signed-off-by: Willy Tarreau <w@....eu>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/stdio.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index a73cf24cb68d..5f1cf32470d3 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -286,4 +286,10 @@ int printf(const char *fmt, ...)
 	return ret;
 }
 
+static __attribute__((unused))
+void perror(const char *msg)
+{
+	fprintf(stderr, "%s%serrno=%d\n", (msg && *msg) ? msg : "", (msg && *msg) ? ": " : "", errno);
+}
+
 #endif /* _NOLIBC_STDIO_H */
-- 
2.31.1.189.g2e36527f23