ea336061c2
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The PR introduces the `platform.Select()` API, wrapping `select(2)` on POSIX and emulated in some cases on Windows. RATIONALE.md contains a full explanation of the approach followed in `poll_oneoff` to handle Stdin and the other types of file descriptors, and the clock subscriptions. It also introduces an abstraction (`StdioFilePoller`) to allow the simulation of different scenarios (waiting for input, input ready, timeout expired, etc.) when unit-testing interactive input. This closes #1317. Signed-off-by: Edoardo Vacchi <evacchi@users.noreply.github.com>
110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
package platform
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import (
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"runtime"
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"testing"
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"github.com/tetratelabs/wazero/internal/testing/require"
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)
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func TestFdSet(t *testing.T) {
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if runtime.GOOS != "linux" && runtime.GOOS != "darwin" {
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t.Skip("not supported")
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}
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allBitsSetAtIndex0 := FdSet{}
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allBitsSetAtIndex0.Bits[0] = -1
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tests := []struct {
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name string
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init FdSet
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exec func(fdSet *FdSet)
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expected FdSet
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}{
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{
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name: "all bits set",
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exec: func(fdSet *FdSet) {
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for fd := 0; fd < nfdbits; fd++ {
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fdSet.Set(fd)
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}
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},
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expected: allBitsSetAtIndex0,
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},
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{
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name: "all bits cleared",
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init: allBitsSetAtIndex0,
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exec: func(fdSet *FdSet) {
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for fd := 0; fd < nfdbits; fd++ {
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fdSet.Clear(fd)
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}
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},
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expected: FdSet{},
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},
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{
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name: "zero should clear all bits",
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init: allBitsSetAtIndex0,
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exec: func(fdSet *FdSet) {
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fdSet.Zero()
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},
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expected: FdSet{},
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},
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{
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name: "is-set should return true for all bits",
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init: allBitsSetAtIndex0,
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exec: func(fdSet *FdSet) {
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for i := range fdSet.Bits {
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require.True(t, fdSet.IsSet(i))
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}
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},
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expected: allBitsSetAtIndex0,
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},
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{
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name: "is-set should return true for all odd bits",
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init: FdSet{},
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exec: func(fdSet *FdSet) {
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for fd := 1; fd < nfdbits; fd += 2 {
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fdSet.Set(fd)
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}
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for fd := 0; fd < nfdbits; fd++ {
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isSet := fdSet.IsSet(fd)
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if fd&0x1 == 0x1 {
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require.True(t, isSet)
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} else {
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require.False(t, isSet)
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}
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}
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fdSet.Zero()
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},
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expected: FdSet{},
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},
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{
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name: "should clear all even bits",
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init: allBitsSetAtIndex0,
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exec: func(fdSet *FdSet) {
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for fd := 0; fd < nfdbits; fd += 2 {
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fdSet.Clear(fd)
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}
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for fd := 0; fd < nfdbits; fd++ {
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isSet := fdSet.IsSet(fd)
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if fd&0x1 == 0x1 {
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require.True(t, isSet)
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} else {
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require.False(t, isSet)
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}
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}
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fdSet.Zero()
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},
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expected: FdSet{},
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},
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}
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for _, tt := range tests {
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tc := tt
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t.Run(tc.name, func(t *testing.T) {
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x := tc.init
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tc.exec(&x)
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require.Equal(t, tc.expected, x)
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})
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}
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}
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