Integrate psignal into main loop and remove conflicting handlers

- Added extern "C" linkage to psignal.h for C++ compatibility
- Integrated psignal_check_pending() into pclsync_lib.cpp main loop
- Integrated psignal_check_pending() into ptimer.c timer loop
- Removed conflicting signal handlers from pfs.c

pclsync/pfs.c

@@ -3616,14 +3616,6 @@ static void psync_set_signal(int sig, void (*handler)(int)) {
   }
 }
 
-static void psync_setup_signals() {
-  psync_set_signal(SIGTERM, psync_signal_handler);
-  psync_set_signal(SIGINT, psync_signal_handler);
-  psync_set_signal(SIGHUP, psync_signal_handler);
-  pfs_debug_register_signal_handlers();
-  psync_set_signal(SIGUSR2, psync_usr2_handler);
-}
-
 static void pfs_init_once() {
 #if pfs_need_per_folder_refresh_const()
   unsigned char rndbuff[16];
@@ -3637,7 +3629,8 @@ static void pfs_init_once() {
   pfs_task_init();
   ppagecache_init();
   atexit(pfs_do_stop);
-  psync_setup_signals();
+  pfs_debug_register_signal_handlers();
+  psync_set_signal(SIGUSR2, psync_usr2_handler);
   pfs_stat_add_files();
   pfs_task_add_banned_folders();
 }

pclsync/psignal.h

@@ -3,7 +3,15 @@
 
 #include <signal.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void psignal_register(int signum);
 int psignal_check_pending(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

pclsync/ptimer.c

@@ -35,6 +35,7 @@
 #include "prun.h"
 #include "psys.h"
 #include "ptimer.h"
+#include "psignal.h"
 
 /* Maximum timeout possible is TIMER_ARRAY_SIZE^TIMER_LEVELS seconds, in the
  * worst case TIMER_LEVELS operations will be preformed for each timer to
@@ -145,8 +146,15 @@ PSYNC_NOINLINE static void timer_process_timers(psync_list *timers) {
 static void timer_thread() {
   psync_list timers;
   time_t lt;
+  int sig;
   lt = __atomic_load_n(&psync_current_time, __ATOMIC_RELAXED);
   while (psync_do_run) {
+    sig = psignal_check_pending();
+    if (sig) {
+      pdbg_logf(D_NOTICE, "received signal %d, shutting down", sig);
+      psync_do_run = 0;
+      break;
+    }
     psync_list_init(&timers);
     psys_sleep_milliseconds(1000);
     __atomic_store_n(&psync_current_time, psys_time_seconds(), __ATOMIC_RELAXED);

pclsync_lib.cpp

@@ -50,6 +50,7 @@
 #include "pclsync/pdbg.h"
 #include "pclsync/psock.h"
 #include "pclsync/plibs.h"
+#include "pclsync/psignal.h"
 
 #include "pclsync_lib.h"
 
@@ -668,6 +669,10 @@ int clib::pclsync_lib::init() {
 
   was_init_ = true;
 
+  psignal_register(SIGINT);
+  psignal_register(SIGTERM);
+  psignal_register(SIGHUP);
+
   if (!get_mount().empty()) {
     psync_set_string_setting("fsroot", get_mount().c_str());
   }