SD−DAEMON - Online Linux Manual PageSection : 3
Updated :
Source : systemd 250
Note : sd-daemon

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NAMEsd-daemon, SD_EMERG, SD_ALERT, SD_CRIT, SD_ERR, SD_WARNING, SD_NOTICE, SD_INFO, SD_DEBUG − APIs for new−style daemons

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SYNOPSIS#include <systemd/sd−daemon​.h>pkg−config −−cflags −−libs libsystemd

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DESCRIPTIONsd−daemon​.h provides APIs for new−style daemons, as implemented by the systemd(1) service manager​. See sd_listen_fds(3), sd_notify(3), sd_booted(3), sd_is_fifo(3), sd_watchdog_enabled(3) for more information about the functions implemented​. In addition to these functions, a couple of logging prefixes are defined as macros: #define SD_EMERG "<0>" /* system is unusable */ #define SD_ALERT "<1>" /* action must be taken immediately */ #define SD_CRIT "<2>" /* critical conditions */ #define SD_ERR "<3>" /* error conditions */ #define SD_WARNING "<4>" /* warning conditions */ #define SD_NOTICE "<5>" /* normal but significant condition */ #define SD_INFO "<6>" /* informational */ #define SD_DEBUG "<7>" /* debug−level messages */These prefixes are intended to be used in conjunction with stderr−based logging (or stdout−based logging) as implemented by systemd​. If a systemd service definition file is configured with StandardError=journal or StandardError=kmsg (and similar with StandardOutput=), these prefixes can be used to encode a log level in lines printed​. This is similar to the kernel printk()−style logging​. See klogctl(2) for more information​. The log levels are identical to syslog(3)'s log level system​. To use these prefixes simply prefix every line with one of these strings​. A line that is not prefixed will be logged at the default log level SD_INFO​. Example ​1. ​Hello World A daemon may log with the log level NOTICE by issuing this call: fprintf(stderr, SD_NOTICE "Hello World!\n");

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NOTESThese APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd ​pkg-config(1) file​.

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SEE ALSOsystemd(1), sd_listen_fds(3), sd_notify(3), sd_booted(3), sd_is_fifo(3), sd_watchdog_enabled(3), daemon(7), systemd.service(5), systemd.socket(5), fprintf(3), pkg-config(1) 0

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