1SD-DAEMON(3)                       sd-daemon                      SD-DAEMON(3)
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NAME

6       sd-daemon, SD_EMERG, SD_ALERT, SD_CRIT, SD_ERR, SD_WARNING, SD_NOTICE,
7       SD_INFO, SD_DEBUG - APIs for new-style daemons
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SYNOPSIS

10       #include <systemd/sd-daemon.h>
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12       pkg-config --cflags --libs libsystemd
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DESCRIPTION

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

51       These APIs are implemented as a shared library, which can be compiled
52       and linked to with the libsystemd pkg-config(1) file.
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SEE ALSO

55       systemd(1), sd_listen_fds(3), sd_notify(3), sd_booted(3),
56       sd_is_fifo(3), sd_watchdog_enabled(3), daemon(7), systemd.service(5),
57       systemd.socket(5), fprintf(3), pkg-config(1)
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61systemd 243                                                       SD-DAEMON(3)
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