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

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[ 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: acab7bcdb1 ("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>
This commit is contained in:
Benjamin Berg 2025-09-24 16:20:50 +02:00 committed by Greg Kroah-Hartman
parent d6bec89235
commit 5bfe033a1b
1 changed files with 4 additions and 0 deletions
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4
tools/include/nolibc/stdio.h
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@ -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))