syscall_plan9_test.go

     1  // Copyright 2018 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  package syscall_test
     6  
     7  import (
     8  	"syscall"
     9  	"testing"
    10  )
    11  
    12  // testalias checks for aliasing of error strings returned by sys1 and sys2,
    13  // which both call the function named fn in package syscall
    14  func testalias(t *testing.T, fn string, sys1, sys2 func() error) {
    15  	err := sys1().Error()
    16  	errcopy := string([]byte(err))
    17  	sys2()
    18  	if err != errcopy {
    19  		t.Errorf("syscall.%s error string changed from %q to %q\n", fn, errcopy, err)
    20  	}
    21  }
    22  
    23  // issue 13770: errors cannot be nested in Plan 9
    24  
    25  func TestPlan9Syserr(t *testing.T) {
    26  	testalias(t,
    27  		"Syscall",
    28  		func() error {
    29  			return syscall.Mkdir("/", 0)
    30  		},
    31  		func() error {
    32  			return syscall.Mkdir("#", 0)
    33  		})
    34  	testalias(t,
    35  		"Syscall6",
    36  		func() error {
    37  			return syscall.Mount(0, 0, "", 0, "")
    38  		},
    39  		func() error {
    40  			return syscall.Mount(-1, 0, "", 0, "")
    41  		})
    42  	// originally failed only on plan9_arm
    43  	testalias(t,
    44  		"seek",
    45  		func() error {
    46  			_, err := syscall.Seek(0, 0, -1)
    47  			return err
    48  		},
    49  		func() error {
    50  			_, err := syscall.Seek(-1, 0, 0)
    51  			return err
    52  		})
    53  }
    54
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