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# termios_h.m4
# serial 8
dnl Copyright (C) 2010-2025 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_ONCE([gl_TERMIOS_H],
[
dnl Ensure to expand the default settings once only, before all statements
dnl that occur in other macros.
AC_REQUIRE([gl_TERMIOS_H_DEFAULTS])
gl_CHECK_NEXT_HEADERS([termios.h])
if test $ac_cv_header_termios_h != yes; then
HAVE_TERMIOS_H=0
fi
if test $ac_cv_header_termios_h = yes; then
AC_CACHE_CHECK([for struct winsize in <termios.h>],
[gl_cv_struct_winsize_in_termios_h],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <termios.h>
]],
[[static struct winsize x; x.ws_row = x.ws_col;]])],
[gl_cv_struct_winsize_in_termios_h=yes],
[gl_cv_struct_winsize_in_termios_h=no])
])
if test $gl_cv_struct_winsize_in_termios_h = no; then
AC_CHECK_HEADERS_ONCE([sys/ioctl.h])
if test $ac_cv_header_sys_ioctl_h = yes; then
AC_CACHE_CHECK([for struct winsize in <sys/ioctl.h>],
[gl_cv_struct_winsize_in_sys_ioctl_h],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/ioctl.h>
]],
[[static struct winsize x; x.ws_row = x.ws_col;]])],
[gl_cv_struct_winsize_in_sys_ioctl_h=yes],
[gl_cv_struct_winsize_in_sys_ioctl_h=no])
])
fi
fi
fi
TERMIOS_H_DEFINES_STRUCT_WINSIZE=0
SYS_IOCTL_H_DEFINES_STRUCT_WINSIZE=0
if test "$gl_cv_struct_winsize_in_termios_h" != yes \
|| test "$gl_cv_struct_winsize_in_sys_ioctl_h" != yes; then
if test "$gl_cv_struct_winsize_in_termios_h" = yes; then
TERMIOS_H_DEFINES_STRUCT_WINSIZE=1
elif test "$gl_cv_struct_winsize_in_sys_ioctl_h" = yes; then
SYS_IOCTL_H_DEFINES_STRUCT_WINSIZE=1
fi
fi
dnl Ensure the type pid_t gets defined.
AC_REQUIRE([AC_TYPE_PID_T])
dnl Check for declarations of anything we want to poison if the
dnl corresponding gnulib module is not in use, and which is not
dnl guaranteed by C89.
gl_WARN_ON_USE_PREPARE([[#include <termios.h>]],
[tcgetsid])
AC_SUBST([TERMIOS_H_DEFINES_STRUCT_WINSIZE])
AC_SUBST([SYS_IOCTL_H_DEFINES_STRUCT_WINSIZE])
])
# gl_TERMIOS_MODULE_INDICATOR([modulename])
# sets the shell variable that indicates the presence of the given module
# to a C preprocessor expression that will evaluate to 1.
# This macro invocation must not occur in macros that are AC_REQUIREd.
AC_DEFUN([gl_TERMIOS_MODULE_INDICATOR],
[
dnl Ensure to expand the default settings once only.
gl_TERMIOS_H_REQUIRE_DEFAULTS
gl_MODULE_INDICATOR_SET_VARIABLE([$1])
dnl Define it also as a C macro, for the benefit of the unit tests.
gl_MODULE_INDICATOR_FOR_TESTS([$1])
])
# Initializes the default values for AC_SUBSTed shell variables.
# This macro must not be AC_REQUIREd. It must only be invoked, and only
# outside of macros or in macros that are not AC_REQUIREd.
AC_DEFUN([gl_TERMIOS_H_REQUIRE_DEFAULTS],
[
m4_defun(GL_MODULE_INDICATOR_PREFIX[_TERMIOS_H_MODULE_INDICATOR_DEFAULTS], [
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_TCGETSID])
])
m4_require(GL_MODULE_INDICATOR_PREFIX[_TERMIOS_H_MODULE_INDICATOR_DEFAULTS])
AC_REQUIRE([gl_TERMIOS_H_DEFAULTS])
])
AC_DEFUN([gl_TERMIOS_H_DEFAULTS],
[
dnl Assume proper GNU behavior unless another module says otherwise.
HAVE_DECL_TCGETSID=1; AC_SUBST([HAVE_DECL_TCGETSID])
HAVE_TERMIOS_H=1; AC_SUBST([HAVE_TERMIOS_H])
])
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