You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ifupdown.rs
    path of file: ./repos/rustybox/networking
    
    the code of the file until where you have to start completion: use crate::libbb::appletlib::applet_name;
use crate::libbb::llist::llist_t;
use crate::libbb::ptr_to_globals::bb_errno;
use crate::libbb::skip_whitespace::skip_whitespace;
use crate::librb::fd_pair;
use crate::librb::size_t;
use crate::librb::smallint;
use c2rust_asm_casts;
use c2rust_asm_casts::AsmCastTrait;
use libc;
use li
    
unsafe fn iface_up(mut iface: *mut interface_defn_t) -> libc::c_int {
  if (*(*iface).method).up.expect("non-null function pointer")(
    iface,
    Some(check as unsafe fn(_: *mut libc::c_char) -> libc::c_int),
  ) == 0
  {
    return -1i32;
  }
  set_environ(
    iface,
    b"start\x00" as *const u8 as *const libc::c_char,
    b"pre-up\x00" as *const u8 as *const libc::c_char,
  );
  if execute_all(iface, b"pre-up\x00" as *const u8 as *const libc::c_char) == 0 {
    return 0;
  }
  if (*(*iface).method).up.expect("non-null function pointer")(
    iface,
    Some(doit as unsafe fn(_: *mut libc::c_char) -> libc::c_int),
  ) == 0
  {
    return 0;
  }
  set_environ(
    iface,
    b"start\x00" as *const u8 as *const libc::c_char,
    b"post-up\x00" as *const u8 as *const libc::c_char,
  );
  if execute_all(iface, b"up\x00" as *const u8 as *const libc::c_char) == 0 {
    return 0;
  }
  return 1i32;
}