Spawn a samename process and capture stderr to file

errlog.go

package main

import (
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

func main() {
	basename := filepath.Base(os.Args[0])
	args := os.Args[1:]
	program, err := exec.LookPath(basename)
	if err != nil {
		log.Fatalf("Cannot find program: %s", err)
	}
	cmd := exec.Command("strace", program, strings.Join(args, " "))
	file, err := os.Create("/tmp/stderr.log")
	if err != nil {
		log.Fatalf("Cannot open log file: %s", err)
	}
	cmd.Stdout = os.Stdout
	cmd.Stderr = file
	cmd.Stdin = os.Stdin
	err = cmd.Start()
	if err != nil {
		log.Fatalf("Error running program: %s", err)
	}
}