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How to Prevent Ctrl C from Interrupting exec.Command Child Processes?

Mary-Kate Olsen
Release: 2024-12-15 02:36:10
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How to Prevent Ctrl C from Interrupting exec.Command Child Processes?

Handling Ctrl C Interruptions in exec.Command

When executing external processes using exec.Command, it's crucial to consider how interruptions, such as Ctrl C, are handled. By default, pressing Ctrl C interrupts the entire process group, including child processes. This behavior can be problematic if you want to prevent interruption of specific processes.

To resolve this issue and prevent Ctrl C from disrupting child processes, follow these steps:

  1. Set Process Group: Before executing the child process, use the SysProcAttr field to configure the process group.

    cmd := exec.Command("sleep", "60")
    cmd.SysProcAttr = &syscall.SysProcAttr{
        Setpgid: true,
    }
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  2. Signal Handling: In the parent process, handle the Ctrl C signal to prevent it from propagating to the process group.

    interrupt := make(chan os.Signal, 1)
    signal.Notify(interrupt, os.Interrupt)
    
    go func() {
        <-interrupt
        log.Println("Ctrl+C received")
        // Perform any necessary cleanup or handling for Ctrl+C
    }()
    
    cmd.Run()
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By separating the process group of the child process and handling the interrupt signal, you can prevent Ctrl C from disrupting the execution of the child process while allowing the parent process to handle the interruption as desired.

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