From fd98286b24a10c2b53f4f4172f68ea8ce46ce1a7 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@member.fsf.org>
Date: Mon, 4 Jan 2016 23:48:59 +0100
Subject: macro that allows errno == 0
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Signed-off-by: Mattias Andrée <maandree@member.fsf.org>
---
doc/man/libhaiku_perror.3 | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
(limited to 'doc/man')
diff --git a/doc/man/libhaiku_perror.3 b/doc/man/libhaiku_perror.3
index 7c0476d..1514470 100644
--- a/doc/man/libhaiku_perror.3
+++ b/doc/man/libhaiku_perror.3
@@ -33,7 +33,18 @@ Unlike
.B libhaiku_perror
shall not print anything if
.B errno
-is zero.
+is zero. If you rather it did, you can use the macro
+.PP
+.nf
+#define libhaiku_perror(s) \\
+ do { \\
+ const char *s__ = (s); \\
+ if (errno && s__) \\
+ perror(s__); \\
+ errno = errno ? errno : -1; \\
+ libhaiku_perror(s__); \\
+ } while (0)
+.fi
.SH "SEE ALSO"
.BR libhaiku (7),
.BR perror (3)
--
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