When a Go program handles SIGINT and other signals, it is necessary to use signal.Notify in the os/signal package to send the signal to the channel. 1. Create a buffered channel to receive the signal; 2. Call signal.Notify to register the signals of interest such as SIGINT and SIGTERM; 3. Wait for signals by blocking the channel; 4. Perform cleaning operations according to the signal type such as closing the connection, saving the status, and stopping the coroutine; 5. Use context to notify other coroutines to exit gracefully; 6. Finally exit the program normally. This method does not require rewriting the signal processing function, it is suitable for cross-platform interrupt processing, and ensures that the program is elegantly closed after receiving the signal.
Handling signals like SIGINT (typically triggered by Ctrl C) in Go is straightforward using the os/signal package. The key is to set up a signal listener so your program can gracefully respond instead of abruptly termination.
Use signal.Notify to catch signals
Go doesn't require you to "override" signal handlers like in C. instead, you use signal.Notify to sending incoming signals to a channel, then handle them in your main logic.
Here's a basic example that catches SIGINT (and optionally SIGTERM ):
package main
import (
"fmt"
"os"
"os/signal"
"syscall"
"time"
)
func main() {
// Create a channel to receive OS signals
sigChan := make(chan os.Signal, 1)
// Notify the channel of SIGINT and SIGTERM
signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
fmt.Println("Waiting for interrupt signal (Ctrl C)...")
// Block until a signal is received
receivedSignal := <-sigChan
fmt.Println("\nReceived signal:", receivedSignal)
// Perform cleanup or graceful shutdown
fmt.Println("Shutting down gracefully...")
time.Sleep(1 * time.Second) // Simulate cleanup
fmt.Println("Done.")
}Key points to remember
- Channel must be buffered : Usually
make(chan os.Signal, 1)— this ensures no signal is missed during setup. -
signal.Notifytakes the channel and a list of signals : If you don't specify, it defaults toos.Interruptandsyscall.SIGTERMon most systems. - It blocks the main goroutine : Waiting on
<-sigChanprevents the program from exiting until a signal arrives.
Handle multiple signals differently
You can distinguish between signals and react accordingly:
switch receivedSignal {
case syscall.SIGINT:
fmt.Println("Caught SIGINT: graceful shutdown")
case syscall.SIGTERM:
fmt.Println("Caught SIGTERM: terminating")
}Clean up and exit properly
After handling the signal, you might want to:
- Close open files or network connections
- Save state
- Stop background goroutines (via context cancellation)
- Exit with a specific status code
Example with context:
ctx, cancel := context.WithCancel(context.Background())
go func() {
<-sigChan
fmt.Println("Signal received, shutting down...")
cancel() // Notify all goroutines
}()
// Your main app logic here, which respects ctx.Done()
<-ctx.Done()Common signals in Go
-
syscall.SIGINT: Ctrl C -
syscall.SIGTERM: Request to terminate (graceful) -
syscall.SIGQUIT: Often used for stack dump -
os.Interrupt: Portable version of interrupt signal (same as SIGINT on Unix)
Note: Windows doesn't support all Unix signals, but
os.Interruptandsyscall.SIGTERMare generally handled.
Basically, just set up a channel, use signal.Notify , and wait for input. It's not complex, but easy to overlook if you're used to other languages.
The above is the detailed content of How to handle signals like SIGINT in Go?. For more information, please follow other related articles on the PHP Chinese website!
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