libcontainer/nsenter/log.h

#ifndef NSENTER_LOG_H
#define NSENTER_LOG_H

#include <stdio.h>

/*
 * Log levels are the same as in logrus.
 */
#define PANIC   0
#define FATAL   1
#define ERROR   2
#define WARNING 3
#define INFO    4
#define DEBUG   5
#define TRACE   6

/*
 * Sets up logging by getting log fd and log level from the environment,
 * if available.
 */
void setup_logpipe(void);

void write_log(int level, const char *format, ...) __attribute__((format(printf, 2, 3)));

extern int logfd;
#define bail(fmt, ...)                                               \
	do {                                                         \
		if (logfd < 0)                                       \
			fprintf(stderr, "FATAL: " fmt ": %m\n",      \
				##__VA_ARGS__);                      \
		else                                                 \
			write_log(FATAL, fmt ": %m", ##__VA_ARGS__); \
		exit(1);                                             \
	} while(0)


#endif /* NSENTER_LOG_H */