Function nc::pwritev2 [−][src]
pub fn pwritev2(
fd: i32,
vec: &[iovec_t],
pos_l: usize,
pos_h: usize,
flags: rwf_t
) -> Result<ssize_t, Errno>
Expand description
Write to a file descriptor without changing file offset.
let path = "/etc/passwd"; let ret = nc::open(path, nc::O_RDONLY, 0); assert!(ret.is_ok()); let fd = ret.unwrap(); let mut buf = [[0_u8; 64]; 4]; let capacity = 4 * 64; let mut iov = Vec::with_capacity(buf.len()); for ref mut item in (&mut buf).iter() { iov.push(nc::iovec_t { iov_len: item.len(), iov_base: item.as_ptr() as usize, }); } let ret = nc::readv(fd, &mut iov); assert!(ret.is_ok()); assert_eq!(ret, Ok(capacity as nc::ssize_t)); assert!(nc::close(fd).is_ok()); let path_out = "/tmp/nc-pwritev2"; let ret = nc::open(path_out, nc::O_WRONLY | nc::O_CREAT, 0o644); assert!(ret.is_ok()); let fd = ret.unwrap(); let flags = nc::RWF_DSYNC | nc::RWF_APPEND; let ret = nc::pwritev2(fd, &iov, 0, iov.len() - 1, flags); assert!(ret.is_ok()); assert_eq!(ret, Ok(capacity as nc::ssize_t)); assert!(nc::close(fd).is_ok()); assert!(nc::unlink(path_out).is_ok());