| # ttyname_r.m4 serial 10 |
| dnl Copyright (C) 2010-2020 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> |
| 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> |
| 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]) |
| ]) |