pub fn fcntl_lock<Fd: AsFd>(fd: Fd, operation: FlockOperation) -> Result<()>Expand description
fcntl(fd, F_SETLK)—Acquire or release an fcntl-style lock.
This function doesn’t currently have an offset or len; it currently always
sets the l_len field to 0, which is a special case that means the entire
file should be locked.
Unlike flock-style locks, fcntl-style locks are process-associated,
meaning that they don’t guard against being acquired by two threads in
the same process.