siginfo_linux_test.go

Documentation: internal/syscall/unix

     1  // Copyright 2023 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 unix_test
     6  
     7  import (
     8  	"internal/goarch"
     9  	"internal/syscall/unix"
    10  	"runtime"
    11  	"strings"
    12  	"testing"
    13  	"unsafe"
    14  )
    15  
    16  // TestSiginfoChildLayout validates SiginfoChild layout. Modelled after
    17  // static assertions in linux kernel's arch/*/kernel/signal*.c.
    18  func TestSiginfoChildLayout(t *testing.T) {
    19  	var si unix.SiginfoChild
    20  
    21  	const host64bit = goarch.PtrSize == 8
    22  
    23  	if v := unsafe.Sizeof(si); v != 128 {
    24  		t.Fatalf("sizeof: got %d, want 128", v)
    25  	}
    26  
    27  	ofSigno := 0
    28  	ofErrno := 4
    29  	ofCode := 8
    30  	if strings.HasPrefix(runtime.GOARCH, "mips") {
    31  		// These two fields are swapped on MIPS platforms.
    32  		ofErrno, ofCode = ofCode, ofErrno
    33  	}
    34  	ofPid := 12
    35  	if host64bit {
    36  		ofPid = 16
    37  	}
    38  	ofUid := ofPid + 4
    39  	ofStatus := ofPid + 8
    40  
    41  	offsets := []struct {
    42  		name string
    43  		got  uintptr
    44  		want int
    45  	}{
    46  		{"Signo", unsafe.Offsetof(si.Signo), ofSigno},
    47  		{"Errno", unsafe.Offsetof(si.Errno), ofErrno},
    48  		{"Code", unsafe.Offsetof(si.Code), ofCode},
    49  		{"Pid", unsafe.Offsetof(si.Pid), ofPid},
    50  		{"Uid", unsafe.Offsetof(si.Uid), ofUid},
    51  		{"Status", unsafe.Offsetof(si.Status), ofStatus},
    52  	}
    53  
    54  	for _, tc := range offsets {
    55  		if int(tc.got) != tc.want {
    56  			t.Errorf("offsetof %s: got %d, want %d", tc.name, tc.got, tc.want)
    57  		}
    58  	}
    59  }
    60
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