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# getusershell.m4
# serial 8
dnl Copyright (C) 2002-2003, 2006, 2008-2025 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.
dnl This file is offered as-is, without any warranty.
AC_DEFUN([gl_FUNC_GETUSERSHELL],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
dnl Persuade glibc <unistd.h> to declare {get,set,end}usershell().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
dnl Check whether the getusershell function exists.
AC_CHECK_FUNCS_ONCE([getusershell])
if test $ac_cv_func_getusershell = yes; then
HAVE_GETUSERSHELL=1
dnl Check whether getusershell is declared.
AC_CHECK_DECLS([getusershell])
if test $ac_cv_have_decl_getusershell = no; then
HAVE_DECL_GETUSERSHELL=0
fi
else
HAVE_GETUSERSHELL=0
dnl Assume that on platforms which declare it, the function exists.
HAVE_DECL_GETUSERSHELL=0
fi
dnl Replace the function on musl unconditionally.
dnl See: https://www.openwall.com/lists/musl/2024/05/18/1
case "$host_os" in
*-musl* | midipix*) REPLACE_GETUSERSHELL=1 ;;
esac
])
# Prerequisites of lib/getusershell.c.
AC_DEFUN([gl_PREREQ_GETUSERSHELL], [:])
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