1# Look up an environment variable more securely.
2dnl Copyright 2013-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_SECURE_GETENV],
8[
9  dnl Persuade glibc <stdlib.h> to declare secure_getenv().
10  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
11
12  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
13  AC_CHECK_FUNCS_ONCE([secure_getenv])
14  if test $ac_cv_func_secure_getenv = no; then
15    HAVE_SECURE_GETENV=0
16  fi
17])
18
19# Prerequisites of lib/secure_getenv.c.
20AC_DEFUN([gl_PREREQ_SECURE_GETENV], [
21  AC_CHECK_FUNCS([__secure_getenv])
22  if test $ac_cv_func___secure_getenv = no; then
23    AC_CHECK_FUNCS([issetugid])
24  fi
25  AC_CHECK_FUNCS_ONCE([getuid geteuid getgid getegid])
26])
27