# pipe.m4 serial 2
dnl Copyright (C) 2004, 2008 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_PIPE],
[
  dnl Prerequisites of lib/pipe.h.
  AC_CHECK_HEADERS_ONCE(unistd.h)
  dnl Prerequisites of lib/pipe.c.
  AC_REQUIRE([AC_C_INLINE])
  AC_REQUIRE([AC_TYPE_MODE_T])
  AC_REQUIRE([AC_FUNC_FORK])
  AC_CHECK_FUNC([posix_spawn],
    [gl_POSIX_SPAWN_WORKS
     case "$gl_cv_func_posix_spawn_works" in
       *yes)
         AC_DEFINE([HAVE_POSIX_SPAWN], 1,
           [Define if you have the posix_spawn() function and it works.])
         ;;
     esac
    ])
])