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external sys_exit : int -> 'a = "caml_sys_exit"
let rec file_descr_not_standard fd =
assert (not Sys.win32);
if (Obj.magic (fd : Unix.file_descr) : int) >= 3 then
fd
else
file_descr_not_standard (Unix.dup fd)
let safe_close fd =
try Unix.close fd with
| Unix.Unix_error _ -> ()
let perform_redirections stdin stdout stderr =
let stdin = file_descr_not_standard stdin in
let stdout = file_descr_not_standard stdout in
let stderr = file_descr_not_standard stderr in
Unix.dup2 stdin Unix.stdin;
Unix.dup2 stdout Unix.stdout;
Unix.dup2 stderr Unix.stderr;
safe_close stdin;
safe_close stdout;
safe_close stderr
(** Note that this function's behavior differs between windows and unix.
- [Unix.create_process{,_env} prog] looks up prog in PATH
- [Unix.execv{_,e} does not look up prog in PATH] *)
let spawn ?env ~prog ~argv ?(stdin = Unix.stdin) ?(stdout = Unix.stdout)
?(stderr = Unix.stderr) () =
let argv = Array.of_list argv in
let env = Option.map ~f:Env.to_unix env in
Pid.of_int
(if Sys.win32 then
match env with
| None -> Unix.create_process prog argv stdin stdout stderr
| Some env -> Unix.create_process_env prog argv env stdin stdout stderr
else
match Unix.fork () with
| 0 -> (
try
ignore (Unix.sigprocmask SIG_SETMASK [] : int list);
perform_redirections stdin stdout stderr;
match env with
| None -> Unix.execv prog argv
| Some env -> Unix.execve prog argv env
with
| _ -> sys_exit 127)
| pid -> pid)