Function sys_readlinkat 

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

Linux sys_readlinkat implementation

Reads the target of a symbolic link relative to a directory file descriptor. Properly queries the VFS and does not append a null terminator.

Arguments:

• abi: LinuxRiscv64Abi context
• trapframe: Trapframe containing syscall arguments
  • arg0: dirfd (directory file descriptor or AT_FDCWD)
  • arg1: pathname (pointer to path string)
  • arg2: buf (buffer to store link contents)
  • arg3: bufsiz (size of buffer)

Returns:

• Number of bytes placed in buf on success
• usize::MAX (Linux -1) on error