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# ttyname_r.m4 serial 11
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_TTYNAME_R],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
dnl Persuade Solaris <unistd.h> to provide the POSIX compliant declaration of
dnl ttyname_r().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS_ONCE([ttyname_r])
if test $ac_cv_have_decl_ttyname_r = no; then
HAVE_DECL_TTYNAME_R=0
fi
AC_CHECK_FUNCS([ttyname_r])
if test $ac_cv_func_ttyname_r = no; then
HAVE_TTYNAME_R=0
else
HAVE_TTYNAME_R=1
dnl On Mac OS X 10.4 (and Solaris 10 without gl_USE_SYSTEM_EXTENSIONS)
dnl the return type is 'char *', not 'int'.
AC_CACHE_CHECK([whether ttyname_r is compatible with its POSIX signature],
[gl_cv_func_ttyname_r_posix],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stddef.h>
#include <unistd.h>]],
[[*ttyname_r (0, NULL, 0);]])
],
[gl_cv_func_ttyname_r_posix=no],
[gl_cv_func_ttyname_r_posix=yes])
])
if test $gl_cv_func_ttyname_r_posix = no; then
REPLACE_TTYNAME_R=1
else
AC_DEFINE([HAVE_POSIXDECL_TTYNAME_R], [1],
[Define if the ttyname_r function has a POSIX compliant declaration.])
dnl On Solaris 10, both ttyname_r functions (the one with the non-POSIX
dnl declaration and the one with the POSIX declaration) refuse to do
dnl anything when the output buffer is less than 128 bytes large.
dnl On OSF/1 5.1, ttyname_r ignores the buffer size and assumes the
dnl buffer is large enough.
dnl On Android 4.3, ttyname_r is a stub that prints
dnl "int ttyname_r(int, char*, size_t)(3) is not implemented on Android"
dnl on stderr and returns -ERANGE.
AC_REQUIRE([AC_CANONICAL_HOST])
case "$host_os" in
linux*-android*)
AC_CACHE_CHECK([whether ttyname_r works at least minimally],
[gl_cv_func_ttyname_r_not_stub],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <errno.h>
#include <unistd.h>
]GL_MDA_DEFINES[
int
main (void)
{
char buf[80];
close(2);
return ttyname_r (-1, buf, sizeof (buf)) == -ERANGE;
}]])],
[gl_cv_func_ttyname_r_not_stub=yes],
[gl_cv_func_ttyname_r_not_stub=no],
[# Guess no on Android.
gl_cv_func_ttyname_r_not_stub="guessing no"
])
])
case "$gl_cv_func_ttyname_r_not_stub" in
*yes) ;;
*) REPLACE_TTYNAME_R=1 ;;
esac
;;
esac
if test $REPLACE_TTYNAME_R = 0; then
AC_CACHE_CHECK([whether ttyname_r works with small buffers],
[gl_cv_func_ttyname_r_works],
[
dnl Initial guess, used when cross-compiling or when /dev/tty cannot
dnl be opened.
changequote(,)dnl
case "$host_os" in
# Guess no on Solaris.
solaris*) gl_cv_func_ttyname_r_works="guessing no" ;;
# Guess no on OSF/1.
osf*) gl_cv_func_ttyname_r_works="guessing no" ;;
# Guess yes otherwise.
*) gl_cv_func_ttyname_r_works="guessing yes" ;;
esac
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <fcntl.h>
#include <unistd.h>
]GL_MDA_DEFINES[
int
main (void)
{
int result = 0;
int fd;
char buf[31]; /* use any size < 128 here */
fd = open ("/dev/tty", O_RDONLY);
if (fd < 0)
result |= 16;
else if (ttyname_r (fd, buf, sizeof (buf)) != 0)
result |= 17;
else if (ttyname_r (fd, buf, 1) == 0)
result |= 18;
return result;
}]])],
[gl_cv_func_ttyname_r_works=yes],
[case $? in
17 | 18) gl_cv_func_ttyname_r_works=no ;;
esac],
[:])
])
case "$gl_cv_func_ttyname_r_works" in
*yes) ;;
*) REPLACE_TTYNAME_R=1 ;;
esac
fi
fi
fi
])
# Prerequisites of lib/ttyname_r.c.
AC_DEFUN([gl_PREREQ_TTYNAME_R], [
AC_CHECK_FUNCS([ttyname])
])
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