update to nix 0.16

Cargo.toml

@@ -23,7 +23,7 @@ lazy_static = "1.3"
 libc = "0.2"
 log = "0.4"
 native-tls = "0.2"
-nix = "0.15"
+nix = "0.16"
 openssl = "0.10"
 pam = "0.7"
 pam-sys = "0.5"

src/tools/daemon.rs

@@ -165,6 +165,7 @@ impl Reloader {
     fn do_exec(self, exe: CString, args: Vec<CString>) -> Result<(), Error> {
         self.pre_exec()?;
         nix::unistd::setsid()?;
+        let args: Vec<&std::ffi::CStr> = args.iter().map(|s| s.as_ref()).collect();
         nix::unistd::execvp(&exe, &args)?;
         Ok(())
     }