exec_unix_test.go

     1  // Copyright 2020 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build unix
     6  
     7  package os_test
     8  
     9  import (
    10  	"errors"
    11  	"internal/testenv"
    12  	"math"
    13  	. "os"
    14  	"runtime"
    15  	"syscall"
    16  	"testing"
    17  )
    18  
    19  func TestErrProcessDone(t *testing.T) {
    20  	testenv.MustHaveGoBuild(t)
    21  	t.Parallel()
    22  
    23  	p, err := StartProcess(testenv.GoToolPath(t), []string{"go"}, &ProcAttr{})
    24  	if err != nil {
    25  		t.Fatalf("starting test process: %v", err)
    26  	}
    27  	p.Wait()
    28  	if got := p.Signal(Kill); got != ErrProcessDone {
    29  		t.Errorf("got %v want %v", got, ErrProcessDone)
    30  	}
    31  }
    32  
    33  // Lookup of a process that does not exist at time of lookup.
    34  func TestProcessAlreadyDone(t *testing.T) {
    35  	// Theoretically MaxInt32 is a valid PID, but the chance of it actually
    36  	// being used is extremely unlikely.
    37  	pid := math.MaxInt32
    38  	if runtime.GOOS == "solaris" || runtime.GOOS == "illumos" {
    39  		// Solaris/Illumos have a lower limit, above which wait returns
    40  		// EINVAL (see waitid in usr/src/uts/common/os/exit.c in
    41  		// illumos). This is configurable via sysconf(_SC_MAXPID), but
    42  		// we'll just take the default.
    43  		pid = 30000 - 1
    44  	}
    45  
    46  	p, err := FindProcess(pid)
    47  	if err != nil {
    48  		t.Fatalf("FindProcess(math.MaxInt32) got err %v, want nil", err)
    49  	}
    50  
    51  	if ps, err := p.Wait(); !errors.Is(err, syscall.ECHILD) {
    52  		t.Errorf("Wait() got err %v (ps %+v), want %v", err, ps, syscall.ECHILD)
    53  	}
    54  
    55  	if err := p.Release(); err != nil {
    56  		t.Errorf("Release() got err %v, want nil", err)
    57  	}
    58  }
    59  
    60  func TestUNIXProcessAlive(t *testing.T) {
    61  	testenv.MustHaveGoBuild(t)
    62  	t.Parallel()
    63  
    64  	p, err := StartProcess(testenv.GoToolPath(t), []string{"sleep", "1"}, &ProcAttr{})
    65  	if err != nil {
    66  		t.Skipf("starting test process: %v", err)
    67  	}
    68  	defer p.Kill()
    69  
    70  	proc, err := FindProcess(p.Pid)
    71  	if err != nil {
    72  		t.Errorf("OS reported error for running process: %v", err)
    73  	}
    74  	err = proc.Signal(syscall.Signal(0))
    75  	if err != nil {
    76  		t.Errorf("OS reported error for running process: %v", err)
    77  	}
    78  }
    79  
    80  func TestProcessBadPID(t *testing.T) {
    81  	p, err := FindProcess(-1)
    82  	if err != nil {
    83  		t.Fatalf("unexpected FindProcess error: %v", err)
    84  	}
    85  	err = p.Signal(syscall.Signal(0))
    86  	if err == nil {
    87  		t.Error("p.Signal succeeded unexpectedly")
    88  	}
    89  }
    90
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