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os: do not assume syscall.Write will write everything

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Fixes #3323.

R=golang-dev, remyoudompheng, gri
CC=golang-dev
https://golang.org/cl/5837047
This commit is contained in:
Russ Cox 2012-03-15 15:10:19 -04:00
parent 20760e4335
commit b7b3652414
1 changed files with 15 additions and 1 deletions
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16
src/pkg/os/file_unix.go
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@ -173,7 +173,21 @@ func (f *File) pread(b []byte, off int64) (n int, err error) {
// write writes len(b) bytes to the File. // write writes len(b) bytes to the File.
// It returns the number of bytes written and an error, if any. // It returns the number of bytes written and an error, if any.
func (f *File) write(b []byte) (n int, err error) { func (f *File) write(b []byte) (n int, err error) {
return syscall.Write(f.fd, b) for {
m, err := syscall.Write(f.fd, b)
n += m
// If the syscall wrote some data but not all (short write)
// or it returned EINTR, then assume it stopped early for
// reasons that are uninteresting to the caller, and try again.
if 0 < m && m < len(b) || err == syscall.EINTR {
b = b[m:]
continue
}
return n, err
}
panic("not reached")
} }
// pwrite writes len(b) bytes to the File starting at byte offset off. // pwrite writes len(b) bytes to the File starting at byte offset off.