82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Pascal Cuoq and Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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#include <caml/mlvalues.h>
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#include <caml/alloc.h>
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#include <caml/memory.h>
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#include <caml/signals.h>
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#include "unixsupport.h"
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#include <windows.h>
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#include <sys/types.h>
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static value alloc_process_status(HANDLE pid, int status)
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{
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value res, st;
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st = caml_alloc(1, 0);
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Field(st, 0) = Val_int(status);
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Begin_root (st);
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res = caml_alloc_small(2, 0);
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Field(res, 0) = Val_long((intnat) pid);
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Field(res, 1) = st;
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End_roots();
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return res;
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}
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enum { CAML_WNOHANG = 1, CAML_WUNTRACED = 2 };
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static int wait_flag_table[] = { CAML_WNOHANG, CAML_WUNTRACED };
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CAMLprim value win_waitpid(value vflags, value vpid_req)
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{
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int flags;
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DWORD status, retcode;
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HANDLE pid_req = (HANDLE) Long_val(vpid_req);
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DWORD err = 0;
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flags = caml_convert_flag_list(vflags, wait_flag_table);
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if ((flags & CAML_WNOHANG) == 0) {
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caml_enter_blocking_section();
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retcode = WaitForSingleObject(pid_req, INFINITE);
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if (retcode == WAIT_FAILED) err = GetLastError();
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caml_leave_blocking_section();
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} else {
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/* GPR#1155: we don't rely solely on GetExitCodeProcess to
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determine whether the process has terminated or not. This is
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because GetExitCodeProcess might return that the process has
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terminated before the resources associated with the process are
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released. This can be a problem since by default one cannot
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delete a file or directory that is still in use. */
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retcode = WaitForSingleObject(pid_req, 0);
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if (retcode == WAIT_TIMEOUT)
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return alloc_process_status((HANDLE) 0, 0);
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if (retcode == WAIT_FAILED) err = GetLastError();
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}
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if (err) {
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win32_maperr(err);
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uerror("waitpid", Nothing);
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}
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if (! GetExitCodeProcess(pid_req, &status)) {
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win32_maperr(GetLastError());
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uerror("waitpid", Nothing);
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}
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if (status == STILL_ACTIVE)
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return alloc_process_status((HANDLE) 0, 0);
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else {
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CloseHandle(pid_req);
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return alloc_process_status(pid_req, status);
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}
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}
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