// 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, (0666 etc.) if applicable. 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 *File, err error) {
if DisableWritesForAppEngine && flag&(O_WRONLY|O_RDWR|O_CREATE|O_EXCL) != 0 {
return nil, &PathError{"open", name, errDisabledWrites}
}
var (
fd int
e error
create bool
excl bool
trunc bool
append bool
)
if flag&O_CREATE == O_CREATE {
flag = flag & ^O_CREATE
create = true
}
if flag&O_EXCL == O_EXCL {
excl = true
}
if flag&O_TRUNC == O_TRUNC {
trunc = true
}
// O_APPEND is emulated on Plan 9
if flag&O_APPEND == O_APPEND {
flag = flag &^ O_APPEND
append = true
}
syscall.ForkLock.RLock()
if (create && trunc) || excl {
fd, e = syscall.Create(name, flag, syscallMode(perm))
} else {
fd, e = syscall.Open(name, flag)
if e != nil && create {
var e1 error
fd, e1 = syscall.Create(name, flag, syscallMode(perm))
if e1 == nil {
e = nil
}
}
}
syscall.ForkLock.RUnlock()
if e != nil {
return nil, &PathError{"open", name, e}
}
if append {
if _, e = syscall.Seek(fd, 0, SEEK_END); e != nil {
return nil, &PathError{"seek", name, e}
}
}
return NewFile(uintptr(fd), name), nil
}
// 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, (0666 etc.) if applicable. If successful,
// methods on the returned File can be used for I/O.
// It returns the File and an error, if any.
func OpenFile(name string, flag int, perm uint32) (file *File, err error) {
var (
fd int
e syscall.Error
create bool
excl bool
trunc bool
append bool
)
if flag&O_CREATE == O_CREATE {
flag = flag & ^O_CREATE
create = true
}
if flag&O_EXCL == O_EXCL {
excl = true
}
if flag&O_TRUNC == O_TRUNC {
trunc = true
}
// O_APPEND is emulated on Plan 9
if flag&O_APPEND == O_APPEND {
flag = flag &^ O_APPEND
append = true
}
syscall.ForkLock.RLock()
if (create && trunc) || excl {
fd, e = syscall.Create(name, flag, perm)
} else {
fd, e = syscall.Open(name, flag)
if e != nil && create {
var e1 syscall.Error
fd, e1 = syscall.Create(name, flag, perm)
if e1 == nil {
e = nil
}
}
}
syscall.ForkLock.RUnlock()
if e != nil {
return nil, &PathError{"open", name, e}
}
if append {
if _, e = syscall.Seek(fd, 0, SEEK_END); e != nil {
return nil, &PathError{"seek", name, e}
}
}
return NewFile(fd, name), nil
}
// 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, (0666 etc.) if applicable. 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) {
var (
fd int
e error
create bool
excl bool
trunc bool
append bool
)
if flag&O_CREATE == O_CREATE {
flag = flag & ^O_CREATE
create = true
}
if flag&O_EXCL == O_EXCL {
excl = true
}
if flag&O_TRUNC == O_TRUNC {
trunc = true
}
// O_APPEND is emulated on Plan 9
if flag&O_APPEND == O_APPEND {
flag = flag &^ O_APPEND
append = true
}
if (create && trunc) || excl {
fd, e = syscall.Create(name, flag, syscallMode(perm))
} else {
fd, e = syscall.Open(name, flag)
if e != nil && create {
var e1 error
fd, e1 = syscall.Create(name, flag, syscallMode(perm))
if e1 == nil {
e = nil
}
}
}
if e != nil {
return nil, &PathError{"open", name, e}
}
if append {
if _, e = syscall.Seek(fd, 0, io.SeekEnd); e != nil {
return nil, &PathError{"seek", name, e}
}
}
return NewFile(uintptr(fd), name), nil
}
// Post a file's descriptor to /srv/name -- Plan 9 specific
func PostFD(name string, fd int) (srv *os.File, err error) {
fname := "/srv/" + name
// Plan 9 flag OWRITE|ORCLOSE|OCEXEC
srvfd, err := syscall.Create(fname, 0x01|0x40|0x20, 0600)
if err != nil {
return
}
srv = os.NewFile(uintptr(srvfd), fname)
_, err = fmt.Fprintf(srv, "%d", fd)
return
}
// 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, (0666 etc.) if applicable. If successful,
// methods on the returned File can be used for I/O.
// It returns the File and an Error, if any.
func OpenFile(name string, flag int, perm uint32) (file *File, err Error) {
var fd int
var e syscall.Error
syscall.ForkLock.RLock()
if flag&O_CREATE == O_CREATE {
fd, e = syscall.Create(name, flag & ^O_CREATE, perm)
} else {
fd, e = syscall.Open(name, flag)
}
syscall.ForkLock.RUnlock()
if e != nil {
return nil, &PathError{"open", name, e}
}
return NewFile(fd, name), nil
}