aecb8e9cdb
This implements `fd_datasync` in WASI, falling back to normal `File.Sync` when unsupported. This also backfills missing usage of sync in GOOS=js. Finally, this updates the WASI status chart based on what's implemented. Signed-off-by: Adrian Cole <adrian@tetrate.io>
45 lines
1.0 KiB
Go
45 lines
1.0 KiB
Go
package platform
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import (
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"bytes"
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"io"
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"os"
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"syscall"
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"testing"
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"github.com/tetratelabs/wazero/internal/testing/require"
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)
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// Test_Fdatasync doesn't guarantee sync works because the operating system may
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// sync anyway. There is no test in Go for syscall.Fdatasync, but closest is
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// similar to below. Effectively, this only tests that things don't error.
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func Test_Fdatasync(t *testing.T) {
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f, err := os.CreateTemp("", t.Name())
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require.NoError(t, err)
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defer f.Close()
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expected := "hello world!"
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// Write the expected data
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_, err = f.Write([]byte(expected))
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require.NoError(t, err)
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// Sync the data.
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if err = Fdatasync(f.Fd()); err == syscall.ENOSYS {
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return // don't continue if it isn't supported.
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}
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require.NoError(t, err)
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// Rewind while the file is still open.
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_, err = f.Seek(0, io.SeekStart)
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require.NoError(t, err)
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// Read data from the file
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var buf bytes.Buffer
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_, err = io.Copy(&buf, f)
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require.NoError(t, err)
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// It may be the case that sync worked.
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require.Equal(t, expected, buf.String())
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}
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