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os: fix write on Plan 9

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In CL 160670043 the write function was changed
so a zero-length write is now allowed. This leads
the ExampleWriter_Init test to fail.

The reason is that Plan 9 preserves message
boundaries, while the os library expects systems
that don't preserve them. We have to ignore
zero-length writes so they will never turn into EOF.

This issue was previously discussed in CL 7406046.

LGTM=bradfitz
R=rsc, bradfitz
CC=golang-codereviews
https://golang.org/cl/163510043
This commit is contained in:
David du Colombier 2014-10-28 22:44:59 +01:00
parent 982dcb249d
commit 5f54f06a35
1 changed files with 3 additions and 0 deletions
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3
src/os/file_plan9.go
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@ -259,6 +259,9 @@ func (f *File) pread(b []byte, off int64) (n int, err error) {
// Since Plan 9 preserves message boundaries, never allow
// a zero-byte write.
func (f *File) write(b []byte) (n int, err error) {
if len(b) == 0 {
return 0, nil
}
return fixCount(syscall.Write(f.fd, b))
}