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https://github.com/opencontainers/runc.git
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Kir Kolyshkin
067b8335e7
We use bail to report fatal errors, and bail always append %m (aka strerror(errno)). In case an error condition did not set errno, the log message will end up with ": Success" or an error from a stale errno value. Either case is confusing for users. Introduce bailx which is the same as bail except it does not append %m, and use it where appropriate. The naming follows libc's err(3) and errx(3). PS we still use bail in a few cases after read or write, even if that read/write did not return an error, because the code does not distinguish between short read/write and error (-1). This will be addressed by the next commit. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#ifndef NSENTER_LOG_H
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#define NSENTER_LOG_H
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#include <stdbool.h>
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#include <stdio.h>
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/*
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* Log levels are the same as in logrus.
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*/
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#define PANIC 0
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#define FATAL 1
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#define ERROR 2
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#define WARNING 3
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#define INFO 4
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#define DEBUG 5
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#define TRACE 6
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/*
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* Sets up logging by getting log fd and log level from the environment,
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* if available.
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*/
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void setup_logpipe(void);
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bool log_enabled_for(int level);
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void write_log(int level, const char *format, ...) __attribute__((format(printf, 2, 3)));
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extern int logfd;
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/* bailx logs a message to logfd (or stderr, if logfd is not available)
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* and terminates the program.
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*/
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#define bailx(fmt, ...) \
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do { \
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if (logfd < 0) \
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fprintf(stderr, "FATAL: " fmt "\n", ##__VA_ARGS__); \
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else \
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write_log(FATAL, fmt, ##__VA_ARGS__); \
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exit(1); \
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} while(0)
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/* bail is the same as bailx, except it also adds ": %m" (errno). */
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#define bail(fmt, ...) bailx(fmt ": %m", ##__VA_ARGS__)
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#endif /* NSENTER_LOG_H */
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