73 lines
1.4 KiB
Go
73 lines
1.4 KiB
Go
package pcp
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import (
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"bufio"
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"log"
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"os"
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"os/exec"
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"syscall"
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"time"
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)
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func Start(quit chan struct{}, logging *bool, prefix string) {
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const pcpCommand string = "pmdumptext -m -l -f '' -t 1.0 -d , -c config"
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cmd := exec.Command("sh", "-c", pcpCommand)
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cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
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logFile, err := os.Create("./" + prefix + ".pcplog")
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if err != nil {
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log.Fatal(err)
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}
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log.Println("Writing pcp logs to file: " + logFile.Name())
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defer logFile.Close()
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pipe, err := cmd.StdoutPipe()
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if err != nil {
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log.Fatal(err)
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}
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//cmd.Stdout = stdout
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scanner := bufio.NewScanner(pipe)
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go func(logging *bool) {
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// Get names of the columns
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scanner.Scan()
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// Write to logfile
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logFile.WriteString(scanner.Text() + "\n")
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// Throw away first set of results
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scanner.Scan()
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seconds := 0
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for scanner.Scan() {
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if *logging {
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log.Println("Logging PCP...")
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logFile.WriteString(scanner.Text() + "\n")
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}
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seconds++
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}
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}(logging)
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log.Println("PCP logging started")
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if err := cmd.Start(); err != nil {
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log.Fatal(err)
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}
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pgid, err := syscall.Getpgid(cmd.Process.Pid)
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select {
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case <-quit:
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log.Println("Stopping PCP logging in 5 seconds")
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time.Sleep(5 * time.Second)
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// http://stackoverflow.com/questions/22470193/why-wont-go-kill-a-child-process-correctly
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// kill process and all children processes
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syscall.Kill(-pgid, 15)
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return
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}
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}
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