Function dup3

pub unsafe fn dup3(oldfd: i32, newfd: i32, flags: i32) -> Result<(), i32> 

Available on crate feature dep_nc only.

Save as dup2(), but can set the close-on-exec flag on newfd.

Examples

let path = "/tmp/nc-dup3-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::dup3(fd, newfd, nc::O_CLOEXEC) };
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());