Function nc::dup2

pub unsafe fn dup2(oldfd: i32, newfd: i32) -> Result<(), Errno>

Create a copy of the file descriptor oldfd, using the speficified file descriptor newfd.

Example

let path = "/tmp/nc-dup2-file";
let fd = unsafe { nc::openat(nc::AT_FDCWD, path, nc::O_CREAT | nc::O_WRONLY | nc::O_TRUNC, 0o644) };
assert!(fd.is_ok());
let fd = fd.unwrap();
let newfd = 8;
let ret = unsafe { nc::dup2(fd, newfd) };
assert!(ret.is_ok());
let ret = unsafe { nc::close(fd) };
assert!(ret.is_ok());
let ret = unsafe { nc::close(newfd) };
assert!(ret.is_ok());
let ret = unsafe { nc::unlinkat(nc::AT_FDCWD, path, 0) };
assert!(ret.is_ok());