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os: Plan 9: avoid doing zero-length writes.

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Plan 9 I/O preserves message boundaries, while Go
library code is written for UNIX-like operating
systems which do not. Avoid doing zero-length
writes in package os.

R=rsc, rminnich, ality, rminnich, r
CC=golang-dev
https://golang.org/cl/7406046
This commit is contained in:
Akshat Kumar 2013-02-22 23:06:25 +01:00 committed by Ron Minnich
parent 56a0bafdb6
commit 722ee1f479
1 changed files with 10 additions and 0 deletions
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10
src/pkg/os/file_plan9.go
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@ -244,13 +244,23 @@ func (f *File) pread(b []byte, off int64) (n int, err error) {
// write writes len(b) bytes to the File.
// It returns the number of bytes written and an error, if any.
// 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 syscall.Write(f.fd, b)
}
// pwrite writes len(b) bytes to the File starting at byte offset off.
// It returns the number of bytes written and an error, if any.
// Since Plan 9 preserves message boundaries, never allow
// a zero-byte write.
func (f *File) pwrite(b []byte, off int64) (n int, err error) {
if len(b) == 0 {
return 0, nil
}
return syscall.Pwrite(f.fd, b, off)
}