Function sys_fallocate 

pub fn sys_fallocate(
    abi: &mut LinuxRiscv64Abi,
    trapframe: &mut Trapframe,
) -> usize

Linux sys_fallocate - Manipulate file space

This is used by glib/Wayland to extend shared memory file size. When mode is 0 (default), it extends the file to at least offset + len.

Arguments:

• fd: File descriptor
• mode: Operation mode (0 = allocate, FALLOC_FL_KEEP_SIZE, etc.)
• offset: Starting offset
• len: Length of the allocation

Returns:

• 0 on success
• negative errno on failure