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Fix #300: add ready:script for services, called when daemon is ready

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In Finit a daemon can signal its readiness by creating/touching its PID
file.  An ancient UNIX concept -- a daemon creates its PID file when it
has set up signal handlers and is ready to receive IPC (signals), right
before entering its while(1) loop.

Finit took the concept a bit further, adding readiness signalling also
to daemon's by touching their PID file after having processed a SIGHUP.

For both these conditions Finit now supports a ready:script, called when
readiness is detected.  In later commits support for s6 and systemd
style readiness notification will be added that will hook the mechanism
implemented in this commit as well.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg committed 2022-08-23 09:37:18 +02:00
1 parent 0ae5071f94
commit abcb3ceb67
4 files changed
+55 -1
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src/svc.h
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@@ -183,6 +183,7 @@ typedef struct svc {
char env[MAX_ARG_LEN];
char pre_script[MAX_ARG_LEN];
char post_script[MAX_ARG_LEN];
char ready_script[MAX_ARG_LEN];
/*
* Used to forcefully kill services that won't shutdown on
@@ -239,6 +240,7 @@ static inline int svc_nohup (svc_t *svc) { return svc && (0 == svc->sigh
static inline int svc_has_pidfile (svc_t *svc) { return svc_is_daemon(svc) && svc->pidfile[0] != 0 && svc->pidfile[0] != '!'; }
static inline int svc_has_pre (svc_t *svc) { return svc->pre_script[0]; }
static inline int svc_has_post (svc_t *svc) { return svc->post_script[0]; }
static inline int svc_has_ready (svc_t *svc) { return svc->ready_script[0];}
static inline void svc_starting (svc_t *svc) { if (svc) svc->starting = 1; }
static inline void svc_started (svc_t *svc) { if (svc) svc->starting = 0; }