407f3ea3c0
This uses ioctl syscalls or appropriate alternative, to detect if stdin/out/err are character devices or not. This caches the result, to ensure performance is ok at runtime as executing stat can approach microsecond overhead. Signed-off-by: Adrian Cole <adrian@tetrate.io>
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package platform
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import (
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"os"
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"path"
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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 Test_IsTerminal(t *testing.T) {
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if !CompilerSupported() {
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t.Skip() // because it will always return false
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}
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dir := t.TempDir()
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require.NoError(t, os.WriteFile(path.Join(dir, "foo"), nil, 0o400))
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file, err := os.Open(path.Join(dir, "foo"))
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require.NoError(t, err)
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defer file.Close()
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// We aren't guaranteed to have a terminal device for os.Stdout, due to how
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// `go test` forks processes. Instead, we test if this is consistent. For
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// example, when run in a debugger, this could end up true.
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stdioIsTTY := IsTerminal(os.Stdout.Fd())
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tests := []struct {
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name string
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file *os.File
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expected bool
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}{
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{name: "Stdin", file: os.Stdin, expected: stdioIsTTY},
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{name: "Stdout", file: os.Stdout, expected: stdioIsTTY},
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{name: "Stderr", file: os.Stderr, expected: stdioIsTTY},
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{name: "File", file: file, expected: false},
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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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require.Equal(t, tc.expected, IsTerminal(tc.file.Fd()))
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})
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}
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}
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