Function nc::call::dup

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

Create a copy of the file descriptor oldfd, using the lowest available file descriptor.

Example

let path = "/tmp/nc-dup-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 fd_dup = unsafe { nc::dup(fd) };
assert!(fd_dup.is_ok());
let fd_dup = fd_dup.unwrap();
let ret = unsafe { nc::close(fd) };
assert!(ret.is_ok());
let ret = unsafe { nc::close(fd_dup) };
assert!(ret.is_ok());
let ret = unsafe { nc::unlinkat(nc::AT_FDCWD, path, 0) };
assert!(ret.is_ok());