log: add CMD_SYSINFO()

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_SYSINFO()
9a926cbb · Christian Brauner · 37b9abb1 · 9a926cbb
Unverified Commit 9a926cbb 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
@@ -435,6 +435,12 @@ ATTR_UNUSED static inline void LXC_##LEVEL(struct lxc_log_locinfo* locinfo,	\
 		fprintf(stderr, "%s - " format, ptr, ##__VA_ARGS__); \
 	} while (0)
+#define CMD_SYSINFO(format, ...)                            \
+	do {                                                \
+		lxc_log_strerror_r;                         \
+		printf("%s - " format, ptr, ##__VA_ARGS__); \
+	} while (0)
 extern int lxc_log_fd;
 extern int lxc_log_syslog(int facility);