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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package osutil
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"syscall"
"time"
)
// RunCmd runs "bin args..." in dir with timeout and returns its output.
func RunCmd(timeout time.Duration, dir, bin string, args ...string) ([]byte, error) {
output := new(bytes.Buffer)
cmd := exec.Command(bin, args...)
cmd.Dir = dir
cmd.Stdout = output
cmd.Stderr = output
if err := cmd.Start(); err != nil {
return nil, fmt.Errorf("failed to start %v %+v: %v", bin, args, err)
}
done := make(chan bool)
go func() {
select {
case <-time.After(time.Hour):
cmd.Process.Kill()
case <-done:
}
}()
defer close(done)
if err := cmd.Wait(); err != nil {
return nil, fmt.Errorf("failed to run %v %+v: %v\n%v", bin, args, err, output.String())
}
return output.Bytes(), nil
}
func LongPipe() (io.ReadCloser, io.WriteCloser, error) {
r, w, err := os.Pipe()
if err != nil {
return nil, nil, fmt.Errorf("failed to create pipe: %v", err)
}
for sz := 128 << 10; sz <= 2<<20; sz *= 2 {
syscall.Syscall(syscall.SYS_FCNTL, w.Fd(), syscall.F_SETPIPE_SZ, uintptr(sz))
}
return r, w, err
}
var wd string
func init() {
var err error
wd, err = os.Getwd()
if err != nil {
panic(fmt.Sprintf("failed to get wd: %v", err))
}
}
func Abs(path string) string {
if wd1, err := os.Getwd(); err == nil && wd1 != wd {
panic("don't mess with wd in a concurrent program")
}
if path == "" || filepath.IsAbs(path) {
return path
}
return filepath.Join(wd, path)
}
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