Run Command in Go and Detach It from Process
In Go, you can execute a command in a detached manner, allowing it to run independently of your program. Here's how you can achieve this:
Code:
<code class="go">package main import ( "fmt" "log" "os" "os/exec" "strconv" "syscall" ) func main() { // Define the command and its arguments cmd := exec.Command("sleep", "120") // Set up the pipes for stdout and stderr stdoutPipe, err := cmd.StdoutPipe() if err != nil { log.Fatal(err) } stderrPipe, err := cmd.StderrPipe() if err != nil { log.Fatal(err) } // Start the command if err := cmd.Start(); err != nil { log.Fatal(err) } // Get the process ID (PID) of the child process pid := cmd.Process.Pid // Print the PID fmt.Printf("PID: %d\n", pid) // Read from the stdout and stderr pipes and log the output go func() { for { buf := make([]byte, 1024) n, err := stdoutPipe.Read(buf) if err != nil { log.Fatal(err) } fmt.Printf("stdout: %s", string(buf[:n])) } }() go func() { for { buf := make([]byte, 1024) n, err := stderrPipe.Read(buf) if err != nil { log.Fatal(err) } fmt.Printf("stderr: %s", string(buf[:n])) } }() // Wait for the command to finish if err := cmd.Wait(); err != nil { if exitErr := cmd.ProcessState.Sys().(syscall.WaitStatus).ExitStatus(); exitErr != 0 { log.Fatal(fmt.Sprintf("Error #48692663: Command exited with code %d", exitErr)) } else { log.Printf("Command exited with exit code 0") } } // Optionally, keep the child process alive even after the parent process exits // This can be achieved by setting `cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}` before starting the command. // Example of sending a signal to the detached process if err := syscall.Kill(pid, os.Interrupt); err != nil { log.Fatalf("Error sending signal to process: %d: %s", pid, err) } else { fmt.Printf("Received ^C and forwarded to process %d\n", pid) } // Optionally, use `syscall.Reap()` to clean up any child processes that are terminated but not yet waited for. }</code>
This code demonstrates how to execute a command in a detached manner, allowing it to continue running independently of the parent process. It provides features such as capturing stdout and stderr, obtaining the process ID, and optionally sending signals to the child process.
Key Considerations:
- Note that detaching a process does not prevent it from becoming orphaned upon the exit of its parent, as the kernel still holds a reference to it.
- Using SysProcAttr.Setpgid can keep the child process alive independently, but it may require additional handling in certain cases.
- Be sure to use Wait() to ensure that the process returns an exit code and you can handle any potential errors.
- Use syscall.Reap() to clean up zombie processes to avoid resource leaks.
The above is the detailed content of How to Execute a Command in Go and Detach It from the Parent Process?. For more information, please follow other related articles on the PHP Chinese website!

The article explains how to use the pprof tool for analyzing Go performance, including enabling profiling, collecting data, and identifying common bottlenecks like CPU and memory issues.Character count: 159

The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.

This article demonstrates creating mocks and stubs in Go for unit testing. It emphasizes using interfaces, provides examples of mock implementations, and discusses best practices like keeping mocks focused and using assertion libraries. The articl

This article explores Go's custom type constraints for generics. It details how interfaces define minimum type requirements for generic functions, improving type safety and code reusability. The article also discusses limitations and best practices

The article discusses Go's reflect package, used for runtime manipulation of code, beneficial for serialization, generic programming, and more. It warns of performance costs like slower execution and higher memory use, advising judicious use and best

This article explores using tracing tools to analyze Go application execution flow. It discusses manual and automatic instrumentation techniques, comparing tools like Jaeger, Zipkin, and OpenTelemetry, and highlighting effective data visualization

The article discusses using table-driven tests in Go, a method that uses a table of test cases to test functions with multiple inputs and outcomes. It highlights benefits like improved readability, reduced duplication, scalability, consistency, and a

The article discusses managing Go module dependencies via go.mod, covering specification, updates, and conflict resolution. It emphasizes best practices like semantic versioning and regular updates.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

SublimeText3 English version
Recommended: Win version, supports code prompts!

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SublimeText3 Linux new version
SublimeText3 Linux latest version

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
