Function nc::pread64

pub unsafe fn pread64(
    fd: i32,
    buf: usize,
    count: usize,
    offset: off_t
) -> Result<ssize_t, Errno>

Read from a file descriptor without changing file offset.

Example

let path = "/etc/passwd";
let ret = unsafe { nc::openat(nc::AT_FDCWD, path, nc::O_RDONLY, 0) };
assert!(ret.is_ok());
let fd = ret.unwrap();
let mut buf = [0_u8; 128];
let read_count = 64;
let ret = unsafe { nc::pread64(fd, buf.as_mut_ptr() as usize, read_count, 0) };
assert!(ret.is_ok());
assert_eq!(ret, Ok(read_count as nc::ssize_t));
let ret = unsafe { nc::close(fd) };
assert!(ret.is_ok());