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os: clarify that mode argument is only used if file is created

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Fixes #30400

Change-Id: Icbd1dda29562afa80c8e37657133a6fe48070ac0
Reviewed-on: https://go-review.googlesource.com/c/163744
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Ian Lance Taylor 2019-02-26 06:31:21 -08:00
parent dc0455225a
commit 4b05dc91b0
1 changed files with 6 additions and 5 deletions
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11
src/os/file.go
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@ -265,10 +265,10 @@ func Open(name string) (*File, error) {
return OpenFile(name, O_RDONLY, 0)
}
// Create creates the named file with mode 0666 (before umask), truncating
// it if it already exists. If successful, methods on the returned
// File can be used for I/O; the associated file descriptor has mode
// O_RDWR.
// Create creates or truncates the named file. If the file already exists,
// it is truncated. If the file does not exist, it is created with mode 0666
// (before umask). If successful, methods on the returned File can
// be used for I/O; the associated file descriptor has mode O_RDWR.
// If there is an error, it will be of type *PathError.
func Create(name string) (*File, error) {
return OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666)
@ -276,7 +276,8 @@ func Create(name string) (*File, error) {
// OpenFile is the generalized open call; most users will use Open
// or Create instead. It opens the named file with specified flag
// (O_RDONLY etc.) and perm (before umask), if applicable. If successful,
// (O_RDONLY etc.). If the file does not exist, and the O_CREATE flag
// is passed, it is created with mode perm (before umask). If successful,
// methods on the returned File can be used for I/O.
// If there is an error, it will be of type *PathError.
func OpenFile(name string, flag int, perm FileMode) (*File, error) {