lxc/log: Adds error_log_errno macro

Suggested usage: return error_log_errno(err, "Failed: %s", "some error"); It sets errno to the value of err, then calls SYSERROR with the format and remaining args. It always returns -1. Suggested-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Thomas Parrott <thomas.parrott@canonical.com>

lxc/log: Adds error_log_errno macro
3e7d1bd1 · Thomas Parrott · bc554fdf · 3e7d1bd1
Commit 3e7d1bd1 authored May 21, 2019 by Thomas Parrott
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log.h src/lxc/log.h +7 -0

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--- a/src/lxc/log.h
+++ b/src/lxc/log.h
@@ -505,6 +505,13 @@ ATTR_UNUSED static inline void LXC_##LEVEL(struct lxc_log_locinfo* locinfo,	\
 	} while (0)
 #endif

+#define error_log_errno(__errno__, format, ...) 	\
+	({						\
+		errno = __errno__;			\
+		SYSERROR(format, ##__VA_ARGS__);	\
+		-1;					\
+	})
+
 extern int lxc_log_fd;

 extern int lxc_log_syslog(int facility);