criu/compel/include/log.h

#ifndef COMPEL_LOG_H__
#define COMPEL_LOG_H__

#include "uapi/compel/compel.h"
#include "uapi/compel/loglevels.h"

#ifndef LOG_PREFIX
# define LOG_PREFIX
#endif

static inline int pr_quelled(unsigned int loglevel)
{
	return compel_log_get_loglevel() < loglevel
		&& loglevel != COMPEL_LOG_MSG;
}

extern void compel_print_on_level(unsigned int loglevel,
		const char *format, ...)
		__attribute__ ((__format__ (__printf__, 2, 3)));

#define pr_msg(fmt, ...)						\
	compel_print_on_level(COMPEL_LOG_MSG,				\
		       fmt, ##__VA_ARGS__)

#define pr_info(fmt, ...)						\
	compel_print_on_level(COMPEL_LOG_INFO,				\
		       LOG_PREFIX fmt, ##__VA_ARGS__)

#define pr_err(fmt, ...)						\
	compel_print_on_level(COMPEL_LOG_ERROR,				\
		       "Error (%s:%d): " LOG_PREFIX fmt,		\
		       __FILE__, __LINE__, ##__VA_ARGS__)

#define pr_err_once(fmt, ...)						\
	do {								\
		static bool __printed;					\
		if (!__printed) {					\
			pr_err(fmt, ##__VA_ARGS__);			\
			__printed = 1;					\
		}							\
	} while (0)

#define pr_warn(fmt, ...)						\
	compel_print_on_level(COMPEL_LOG_WARN,				\
		       "Warn  (%s:%d): " LOG_PREFIX fmt,		\
		       __FILE__, __LINE__, ##__VA_ARGS__)

#define pr_warn_once(fmt, ...)						\
	do {								\
		static bool __printed;					\
		if (!__printed) {					\
			pr_warn(fmt, ##__VA_ARGS__);			\
			__printed = 1;					\
		}							\
	} while (0)

#define pr_debug(fmt, ...)						\
	compel_print_on_level(COMPEL_LOG_DEBUG,				\
		       LOG_PREFIX fmt, ##__VA_ARGS__)

#define pr_perror(fmt, ...)						\
	pr_err(fmt ": %m\n", ##__VA_ARGS__)

#endif /* COMPEL_LOG_H__ */