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// +build !windows
package caddy
import (
"log"
"os"
"os/signal"
"syscall"
)
// trapSignalsPosix captures POSIX-only signals.
func trapSignalsPosix() {
go func() {
sigchan := make(chan os.Signal, 1)
signal.Notify(sigchan, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGUSR1)
for sig := range sigchan {
switch sig {
case syscall.SIGTERM:
log.Println("[INFO] SIGTERM: Terminating process")
if PidFile != "" {
os.Remove(PidFile)
}
os.Exit(0)
case syscall.SIGQUIT:
log.Println("[INFO] SIGQUIT: Shutting down")
exitCode := executeShutdownCallbacks("SIGQUIT")
err := Stop()
if err != nil {
log.Printf("[ERROR] SIGQUIT stop: %v", err)
exitCode = 1
}
if PidFile != "" {
os.Remove(PidFile)
}
os.Exit(exitCode)
case syscall.SIGHUP:
log.Println("[INFO] SIGHUP: Hanging up")
err := Stop()
if err != nil {
log.Printf("[ERROR] SIGHUP stop: %v", err)
}
case syscall.SIGUSR1:
log.Println("[INFO] SIGUSR1: Reloading")
// Start with the existing Caddyfile
instancesMu.Lock()
if len(instances) == 0 {
instancesMu.Unlock()
log.Println("[ERROR] SIGUSR1: No server instances are fully running")
continue
}
inst := instances[0] // we only support one instance at this time
instancesMu.Unlock()
updatedCaddyfile := inst.caddyfileInput
if updatedCaddyfile == nil {
// Hmm, did spawing process forget to close stdin? Anyhow, this is unusual.
log.Println("[ERROR] SIGUSR1: no Caddyfile to reload (was stdin left open?)")
continue
}
if loaderUsed.loader == nil {
// This also should never happen
log.Println("[ERROR] SIGUSR1: no Caddyfile loader with which to reload Caddyfile")
continue
}
// Load the updated Caddyfile
newCaddyfile, err := loaderUsed.loader.Load(inst.serverType)
if err != nil {
log.Printf("[ERROR] SIGUSR1: loading updated Caddyfile: %v", err)
continue
}
if newCaddyfile != nil {
updatedCaddyfile = newCaddyfile
}
// Kick off the restart; our work is done
inst, err = inst.Restart(updatedCaddyfile)
if err != nil {
log.Printf("[ERROR] SIGUSR1: %v", err)
}
}
}
}()
}
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