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unix: add FcntlFstore on darwin

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This allows to perform a fcntl syscall with the F_PREALLOCATE command.
See man fcntl(2) on macOS for details.

Change-Id: I21f95b91269513064859425ab7adc42a73d6adb5
Reviewed-on: https://go-review.googlesource.com/c/sys/+/255917
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tobias Klauser
2020-09-18 17:44:21 +00:00
committed by Tobias Klauser
parent efd3b9a0ff
commit af09f7315a
2 changed files with 39 additions and 1 deletions
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unix/fcntl_darwin.go
+6
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@@ -16,3 +16,9 @@ func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
_, err := fcntl(int(fd), cmd, int(uintptr(unsafe.Pointer(lk))))
return err
}
// FcntlFstore performs a fcntl syscall for the F_PREALLOCATE command.
func FcntlFstore(fd uintptr, cmd int, fstore *Fstore_t) error {
_, err := fcntl(int(fd), cmd, int(uintptr(unsafe.Pointer(fstore))))
return err
}