Mercurial > gnulib
view m4/ptsname_r.m4 @ 40140:81f075eaa990
ptsname_r: Work around bug on Android 4.3.
* m4/ptsname_r.m4 (gl_FUNC_PTSNAME_R): Define
HAVE_ESSENTIALLY_WORKING_PTSNAME_R. Test whether the return value is
correct.
* lib/ptsname_r.c (__ptsname_r): If HAVE_ESSENTIALLY_WORKING_PTSNAME_R
is defined, just fix the return value.
* doc/glibc-functions/ptsname_r.texi: Mention the Android bug. Reword:
The behaviour of musl libc is nothing to be "fixed", since it is
compliant with the next POSIX standard.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 26 Jan 2019 15:23:19 +0100 |
parents | b06060465f09 |
children |
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# ptsname_r.m4 serial 6 dnl Copyright (C) 2010-2019 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_PTSNAME_R], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) dnl Persuade glibc <stdlib.h> to declare ptsname_r(). AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) AC_CHECK_FUNCS_ONCE([ptsname_r]) if test $ac_cv_func_ptsname_r = no; then HAVE_PTSNAME_R=0 else dnl On OSF/1 5.1, the type of the third argument is 'int', not 'size_t', dnl and the declaration is missing if _REENTRANT is not defined. AC_CACHE_CHECK([whether ptsname_r has the same signature as in glibc], [gl_cv_func_ptsname_r_signature_ok], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include <stddef.h> #include <stdlib.h> /* Test whether ptsname_r is declared at all. */ int (*f) (int, char *, size_t) = ptsname_r; /* Test whether it has the same declaration as in glibc. */ #undef ptsname_r extern #ifdef __cplusplus "C" #endif int ptsname_r (int, char *, size_t); ]], [[return f (0, NULL, 0);]]) ], [gl_cv_func_ptsname_r_signature_ok=yes], [gl_cv_func_ptsname_r_signature_ok=no]) ]) if test $gl_cv_func_ptsname_r_signature_ok = no; then REPLACE_PTSNAME_R=1 else AC_DEFINE([HAVE_ESSENTIALLY_WORKING_PTSNAME_R], [1], [Define to 1 if ptsname_r() is essentially working.]) dnl On Android 4.3, when ptsname_r fails, it returns -1 instead of the dnl error code. AC_REQUIRE([AC_CANONICAL_HOST]) AC_CACHE_CHECK([whether ptsname_r returns an error code], [gl_cv_func_ptsname_r_retval_ok], [AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <stdlib.h> int main (void) { char buf[80]; return ptsname_r (-1, buf, sizeof buf) == -1; }]])], [gl_cv_func_ptsname_r_retval_ok=yes], [gl_cv_func_ptsname_r_retval_ok=no], [case "$host_os" in dnl Guess no on Android. linux*-android*) gl_cv_func_ptsname_r_retval_ok="guessing no" ;; dnl Guess yes otherwise. *) gl_cv_func_ptsname_r_retval_ok="guessing yes" ;; esac ]) ]) case "$gl_cv_func_ptsname_r_retval_ok" in *yes) ;; *) REPLACE_PTSNAME_R=1 ;; esac fi fi AC_REQUIRE([AC_HEADER_MAJOR]) ]) # Prerequisites of lib/ptsname.c. AC_DEFUN([gl_PREREQ_PTSNAME_R], [ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether isatty sets errno when it fails], [gl_cv_func_isatty_sets_errno], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [[#include <errno.h> #if defined _WIN32 && ! defined __CYGWIN__ # include <io.h> #else # include <unistd.h> #endif ]], [[errno = 0; isatty (-1); return errno == 0; ]]) ], [gl_cv_func_isatty_sets_errno=yes], [gl_cv_func_isatty_sets_errno=no], [case "$host_os" in irix* | solaris*) gl_cv_func_isatty_sets_errno="guessing no" ;; mingw*) # Guess yes on mingw, no on MSVC. AC_EGREP_CPP([Known], [ #ifdef __MINGW32__ Known #endif ], [gl_cv_func_isatty_sets_errno="guessing yes"], [gl_cv_func_isatty_sets_errno="guessing no"]) ;; *) gl_cv_func_isatty_sets_errno="guessing yes" ;; esac ]) ]) case "$gl_cv_func_isatty_sets_errno" in *yes) ;; *) AC_DEFINE([ISATTY_FAILS_WITHOUT_SETTING_ERRNO], [1], [Define to 1 if isatty() may fail without setting errno.]) ;; esac ])