Original bug ID: 7561
Reporter: @nojb
Status: resolved (set by @xavierleroy on 2017-06-22T18:06:23Z)
Resolution: not a bug
Priority: normal
Severity: minor
Category: otherlibs
Monitored by: @dbuenzli

Bug description

I found the following puzzling behaviour while working on #1200.

Unix.open_process_full seems to have problems with with UTF-8 characters in the "env" parameter. See steps to reproduce below.

• When passing ASCII characters it works fine.

• Using the Unix.execve call (rather than Unix.open_process_full) seems to work fine.

• It also works fine on Windows (where a different implementation is used).

• I tried it with trunk and 4.05.

Steps to reproduce

Put the following in printenv.c:

#include 

int main(int argc, char ** argv, char ** envp)
{
  int i = 0;
  while (envp[i]) printf("%s\n", envp[i++]);
  return 0;
}

and in test.ml:

let envp = [|
  "e?te?=????????";
  "simple=??";
  "sœur=????";
  "??=????";
|]

let () =
  let (ic, _, _) as proc = Unix.open_process_full "./printenv.exe" envp in
  let rec loop () =
    match input_line ic with
    | s -> s :: loop ()
    | exception End_of_file -> []
  in
  List.iter print_endline (loop ());
  ignore (Unix.close_process_full proc)

Compile & run by doing

gcc printenv.c -o printenv.exe
ocaml unix.cma test.ml

In my machine I see only the second line of envp and PWD as output.

File attachments

• test.ml