sd_event_set_signal_exit - Man Page

#include <systemd/sd-event​.h>

int sd_event_set_signal_exit(sd_event *event, int b);

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

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​.

Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemd ​pkg-config(1) file​.

All functions listed here are thread-agnostic and only a single thread may operate on a given object at any given time​. Different threads may access the same object at different times​. Multiple independent objects may be used from different threads in parallel​.

The code described here uses getenv(3), which is declared to be not multi-thread-safe​. This means that the code calling the functions described here must not call setenv(3) from a parallel thread​. It is recommended to only do calls to setenv() from an early phase of the program when no other threads have been started​.

sd_event_set_signal_exit() was added in version 252​.

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