log: add CMD_SYSERROR()

Add a thread-safe and uniform way to retrieve errno values in programs that are shipped as part of LXC but are not expected to have access to the logging system. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

log: add CMD_SYSERROR()
37b9abb1 · Christian Brauner · ee75dca2 · 37b9abb1
Unverified Commit 37b9abb1 authored Aug 16, 2018 by Christian Brauner
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log.h src/lxc/log.h +6 -0

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--- a/src/lxc/log.h
+++ b/src/lxc/log.h
@@ -429,6 +429,12 @@ ATTR_UNUSED static inline void LXC_##LEVEL(struct lxc_log_locinfo* locinfo,	\
 		ERROR("%s - " format, ptr, ##__VA_ARGS__); \
 	} while (0)

+#define CMD_SYSERROR(format, ...)                                    \
+	do {                                                         \
+		lxc_log_strerror_r;                                  \
+		fprintf(stderr, "%s - " format, ptr, ##__VA_ARGS__); \
+	} while (0)
+
 extern int lxc_log_fd;

 extern int lxc_log_syslog(int facility);