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// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package main
import (
"fmt"
"os"
"path/filepath"
"strings"
"syscall"
"time"
)
func getRusageLogFilename(env env) string {
value, _ := env.getenv("GETRUSAGE")
return value
}
func logRusage(env env, logFileName string, compilerCmd *command) (exitCode int, err error) {
rusageBefore := syscall.Rusage{}
if err := syscall.Getrusage(syscall.RUSAGE_CHILDREN, &rusageBefore); err != nil {
return 0, err
}
compilerCmdWithoutRusage := &command{
Path: compilerCmd.Path,
Args: compilerCmd.Args,
EnvUpdates: append(compilerCmd.EnvUpdates, "GETRUSAGE="),
}
startTime := time.Now()
exitCode, err = wrapSubprocessErrorWithSourceLoc(compilerCmdWithoutRusage,
env.run(compilerCmdWithoutRusage, env.stdin(), env.stdout(), env.stderr()))
if err != nil {
return 0, err
}
elapsedRealTime := time.Since(startTime)
rusageAfter := syscall.Rusage{}
if err := syscall.Getrusage(syscall.RUSAGE_CHILDREN, &rusageAfter); err != nil {
return 0, err
}
elapsedSysTime := time.Duration(rusageAfter.Stime.Nano()-rusageBefore.Stime.Nano()) * time.Nanosecond
elapsedUserTime := time.Duration(rusageAfter.Utime.Nano()-rusageBefore.Utime.Nano()) * time.Nanosecond
// Note: We assume that the compiler takes more heap than any other
// subcommands that we might have executed before.
maxMemUsed := rusageAfter.Maxrss
absCompilerPath := getAbsCmdPath(env, compilerCmd)
if err := os.MkdirAll(filepath.Dir(logFileName), 0777); err != nil {
return 0, wrapErrorwithSourceLocf(err, "error creating rusage log directory %s", logFileName)
}
// Note: using file mode 0666 so that a root-created log is writable by others.
logFile, err := os.OpenFile(logFileName, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0666)
if err != nil {
return 0, wrapErrorwithSourceLocf(err, "error creating rusage logfile %s", logFileName)
}
timeUnit := float64(time.Second)
if _, err := fmt.Fprintf(logFile, "%.5f : %.5f : %.5f : %d : %s : %s\n",
float64(elapsedRealTime)/timeUnit, float64(elapsedUserTime)/timeUnit, float64(elapsedSysTime)/timeUnit,
maxMemUsed, absCompilerPath,
strings.Join(append([]string{filepath.Base(absCompilerPath)}, compilerCmd.Args...), " ")); err != nil {
_ = logFile.Close()
return 0, wrapErrorwithSourceLocf(err, "error writing rusage logfile %s", logFileName)
}
if err := logFile.Close(); err != nil {
return 0, wrapErrorwithSourceLocf(err, "error closing rusage logfile %s", logFileName)
}
return exitCode, nil
}
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