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# tcgetsid.m4 serial 5
dnl Copyright (C) 2010-2023 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_FUNC_TCGETSID],
[
AC_REQUIRE([gl_TERMIOS_H_DEFAULTS])
dnl Persuade glibc <termios.h> to declare tcgetsid().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS([tcgetsid], , , [[#include <termios.h>]])
if test $ac_cv_have_decl_tcgetsid = no; then
HAVE_DECL_TCGETSID=0
fi
dnl We can't use AC_CHECK_FUNC here, because tcgetsid() is defined as a
dnl static inline function when compiling for Android 4.4 or older.
AC_CACHE_CHECK([for tcgetsid], [gl_cv_func_tcgetsid],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <termios.h>]],
[[return tcgetsid(0);]])
],
[gl_cv_func_tcgetsid=yes],
[gl_cv_func_tcgetsid=no])
])
if test $gl_cv_func_tcgetsid = yes; then
HAVE_TCGETSID=1
else
HAVE_TCGETSID=0
fi
])
# Prerequisites of lib/tcgetsid.c.
AC_DEFUN([gl_PREREQ_TCGETSID], [
:
])
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