sd_event_set_signal_exit(3) — Linux manual page



NAME         top

       sd_event_set_signal_exit - Automatically leave event loop on

SYNOPSIS         top

       #include <systemd/sd-event.h>

       int sd_event_set_signal_exit(sd_event *event, int b);

DESCRIPTION         top

       sd_event_set_signal_exit() may be used to ensure the event loop
       terminates once a SIGINT or SIGTERM signal is received. It is a
       convencience wrapper around invocations of sd_event_add_signal(3)
       for both signals. The two signals are automatically added to the
       calling thread's signal mask (if a program is multi-threaded care
       should be taken to either invoke this function before the first
       thread is started or to manually block the two signals
       process-wide first).

       If the parameter b is specified as true, the event loop will
       terminate on SIGINT and SIGTERM. If specified as false, it will
       no longer. When this functionality is turned off the calling
       thread's signal mask is restored to match the state before it was
       turned on, for the two signals. By default the two signals are
       not handled by the event loop, and Linux' default signal handling
       for them is in effect.

       It's customary for UNIX programs to exit on either of these two
       signals, hence it's typically a good idea to enable this
       functionality for the main event loop of a program.

RETURN VALUE         top

       sd_event_set_signal_exit() returns a positive non-zero value when
       the setting was successfully changed. It returns a zero when the
       specified setting was already in effect. On failure, it returns a
       negative errno-style error code.

       Returned errors may indicate the following problems:

           The event loop has been created in a different process.

           The passed event loop object was invalid.

NOTES         top

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

SEE ALSO         top

       systemd(1), sd-event(3), sd_event_new(3), sd_event_add_signal(3)

COLOPHON         top

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systemd 252                                  SD_EVENT_SET_SIGNAL_EXIT(3)

Pages that refer to this page: systemd.directives(7)systemd.index(7)