33 lines
831 B
Go
33 lines
831 B
Go
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package goagain
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import (
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"fmt"
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"net"
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"os"
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"syscall"
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)
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// Block this goroutine awaiting signals. Signals are handled as they
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// are by Nginx and Unicorn: <http://unicorn.bogomips.org/SIGNALS.html>.
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func AwaitSignals(l net.Listener) (err error) {
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_, err = Wait(l)
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return
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}
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// Convert and validate the GOAGAIN_FD, GOAGAIN_NAME, and GOAGAIN_PPID
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// environment variables. If all three are present and in order, this
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// is a child process that may pick up where the parent left off.
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func GetEnvs() (l net.Listener, ppid int, err error) {
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if _, err = fmt.Sscan(os.Getenv("GOAGAIN_PPID"), &ppid); nil != err {
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return
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}
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l, err = Listener()
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return
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}
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// Send SIGQUIT to the given ppid in order to complete the handoff to the
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// child process.
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func KillParent(ppid int) error {
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return syscall.Kill(ppid, syscall.SIGQUIT)
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}
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