| // Copyright 2023 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package unix |
| |
| import "syscall" |
| |
| func PosixFallocate(fd int, off int64, size int64) error { |
| // If successful, posix_fallocate() returns zero. It returns an error on failure, without |
| // setting errno. See https://man.freebsd.org/cgi/man.cgi?query=posix_fallocate&sektion=2&n=1 |
| // |
| // The padding 0 argument is needed because the ARM calling convention requires that if an |
| // argument (off in this case) needs double-word alignment (8-byte), the NCRN (next core |
| // register number) is rounded up to the next even register number. |
| // See https://github.com/ARM-software/abi-aa/blob/2bcab1e3b22d55170c563c3c7940134089176746/aapcs32/aapcs32.rst#parameter-passing |
| r1, _, _ := syscall.Syscall6(posixFallocateTrap, uintptr(fd), 0, uintptr(off), uintptr(off>>32), uintptr(size), uintptr(size>>32)) |
| if r1 != 0 { |
| return syscall.Errno(r1) |
| } |
| return nil |
| } |