Function fcntl

pub unsafe fn fcntl(fd: i32, cmd: u32, arg: *const c_void) -> Result<i32, i32> 

Available on crate feature dep_nc only.

manipulate file descriptor.

Examples

let path = "/etc/passwd";
let ret = unsafe { nc::openat(nc::AT_FDCWD, path, nc::O_RDONLY, 0) };
assert!(ret.is_ok());
let fd = ret.unwrap();

let ret = unsafe { nc::fcntl(fd, nc::F_DUPFD, std::ptr::null()) };
assert!(ret.is_ok());
let fd2 = ret.unwrap();
let ret = unsafe { nc::close(fd) };
assert!(ret.is_ok());
let ret = unsafe { nc::close(fd2) };
assert!(ret.is_ok());