Function nc::read

pub fn read(fd: i32, buf_ptr: usize, count: size_t) -> Result<ssize_t, Errno>

Read from a file descriptor.

let path = "/etc/passwd";
let ret = nc::openat(nc::AT_FDCWD, path, nc::O_RDONLY, 0);
assert!(ret.is_ok());
let fd = ret.unwrap();
let mut buf = [0_u8; 4 * 1024];
let ret = nc::read(fd, buf.as_mut_ptr() as usize, buf.len());
assert!(ret.is_ok());
let n_read = ret.unwrap();
assert!(n_read <= buf.len() as nc::ssize_t);
assert!(nc::close(fd).is_ok());