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Diffstat (limited to 'm4/pty.m4')
| -rw-r--r-- | m4/pty.m4 | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/m4/pty.m4 b/m4/pty.m4 new file mode 100644 index 00000000..c68cca75 --- /dev/null +++ b/m4/pty.m4 @@ -0,0 +1,148 @@ +# pty.m4 serial 13 +dnl Copyright (C) 2010-2014 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. + +# gl_PTY_LIB +# ---------- +# Define automake variable PTY_LIB to the library needed (if any). +AC_DEFUN([gl_PTY_LIB], +[ + # Check for the library required for forkpty. + PTY_LIB= + save_LIBS="$LIBS" + AC_SEARCH_LIBS([forkpty], [util], + [if test "$ac_cv_search_forkpty" != "none required"; then + PTY_LIB="$ac_cv_search_forkpty" + fi]) + LIBS="$save_LIBS" + AC_SUBST([PTY_LIB]) +]) + +AC_DEFUN([gl_FUNC_FORKPTY], +[ + AC_REQUIRE([gl_PTY_LIB]) + AC_REQUIRE([gl_PTY_H]) + + dnl We assume that forkpty exists (possibly in libc, possibly in libutil) + dnl if and only if it is declared. + AC_CHECK_DECLS([forkpty],,, [[ +/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0. */ +#include <sys/types.h> +#if HAVE_PTY_H +# include <pty.h> +#endif +#if HAVE_UTIL_H +# include <util.h> +#endif +#if HAVE_LIBUTIL_H +# include <libutil.h> +#endif +]]) + if test $ac_cv_have_decl_forkpty = yes; then + dnl The system has forkpty. + dnl Prefer glibc's const-safe prototype, if available. + AC_CACHE_CHECK([for const-safe forkpty signature], + [gl_cv_func_forkpty_const], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[ +/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0. */ +#include <sys/types.h> +#if HAVE_PTY_H +# include <pty.h> +#endif +#if HAVE_UTIL_H +# include <util.h> +#endif +#if HAVE_LIBUTIL_H +# include <libutil.h> +#endif + ]], [[ + int forkpty (int *, char *, struct termios const *, + struct winsize const *); + ]]) + ], + [gl_cv_func_forkpty_const=yes], [gl_cv_func_forkpty_const=no]) + ]) + if test $gl_cv_func_forkpty_const != yes; then + REPLACE_FORKPTY=1 + fi + else + dnl The system does not have forkpty. + HAVE_FORKPTY=0 + fi + AC_DEFINE_UNQUOTED([HAVE_FORKPTY], [$HAVE_FORKPTY], + [Define to 1 if the system has the 'forkpty' function.]) +]) + +AC_DEFUN([gl_FUNC_OPENPTY], +[ + AC_REQUIRE([gl_PTY_LIB]) + AC_REQUIRE([gl_PTY_H]) + + dnl Persuade Solaris <stdlib.h> to declare posix_openpt(). + AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) + + dnl We assume that openpty exists (possibly in libc, possibly in libutil) + dnl if and only if it is declared. + AC_CHECK_DECLS([openpty],,, [[ +/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0. */ +#include <sys/types.h> +#if HAVE_PTY_H +# include <pty.h> +#endif +#if HAVE_UTIL_H +# include <util.h> +#endif +#if HAVE_LIBUTIL_H +# include <libutil.h> +#endif +]]) + if test $ac_cv_have_decl_openpty = yes; then + AC_DEFINE([HAVE_OPENPTY], [1], + [Define to 1 if the system has the 'openpty' function.]) + dnl The system has openpty. + dnl Prefer glibc's const-safe prototype, if available. + AC_CACHE_CHECK([for const-safe openpty signature], + [gl_cv_func_openpty_const], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[ +/* <sys/types.h> is a prerequisite of <libutil.h> on FreeBSD 8.0. */ +#include <sys/types.h> +#if HAVE_PTY_H +# include <pty.h> +#endif +#if HAVE_UTIL_H +# include <util.h> +#endif +#if HAVE_LIBUTIL_H +# include <libutil.h> +#endif + ]], [[ + int openpty (int *, int *, char *, struct termios const *, + struct winsize const *); + ]]) + ], + [gl_cv_func_openpty_const=yes], [gl_cv_func_openpty_const=no]) + ]) + if test $gl_cv_func_openpty_const != yes; then + REPLACE_OPENPTY=1 + fi + else + dnl The system does not have openpty. + HAVE_OPENPTY=0 + dnl Prerequisites of lib/openpty.c in this case. + AC_CHECK_FUNCS([_getpty posix_openpt]) + fi +]) + +AC_DEFUN([gl_FUNC_LOGIN_TTY], +[ + AC_REQUIRE([gl_PTY_LIB]) + + gl_saved_libs="$LIBS" + LIBS="$LIBS $PTY_LIB" + AC_CHECK_FUNCS([login_tty]) + LIBS="$gl_saved_LIBS" +]) |