kc3-lang/gnulib/m4/ptsname_r.m4

• Show log

  Commit

• Hash : 3925836a
  Author :
  Date : 2024-04-09T01:16:15
  

  ptsname_r: Work around ptsname_r bug on NetBSD 10.0.
  
  * m4/ptsname_r.m4 (gl_FUNC_PTSNAME_R): On NetBSD, arrange to override
  ptsname_r.
  * lib/ptsname_r.c (ptsname_r): Add workaround for NetBSD bug.
  * doc/glibc-functions/ptsname_r.texi: Mention the NetBSD bug.
  

Download

• m4/ptsname_r.m4

• # ptsname_r.m4
  # serial 10
  dnl Copyright (C) 2010-2024 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 $gl_cv_func_ptsname_r_signature_ok = no; then
        REPLACE_PTSNAME_R=1
      else
        AC_DEFINE([HAVE_ESSENTIALLY_WORKING_PTSNAME_R], [1],
          [Define to 1 if ptsname_r() is essentially working.])
        dnl On FreeBSD 13.0 and Android 4.3, when ptsname_r fails, it returns -1
        dnl instead of the error code.
        AC_REQUIRE([AC_CANONICAL_HOST])
        AC_CACHE_CHECK([whether ptsname_r returns an error code],
          [gl_cv_func_ptsname_r_retval_ok],
          [AC_RUN_IFELSE(
             [AC_LANG_SOURCE([[
  #include <stdlib.h>
  int
  main (void)
  {
    char buf[80];
    return ptsname_r (-1, buf, sizeof buf) == -1;
  }]])],
             [gl_cv_func_ptsname_r_retval_ok=yes],
             [gl_cv_func_ptsname_r_retval_ok=no],
             [case "$host_os" in
                dnl Guess no on FreeBSD, Android.
                freebsd* | dragonfly* | midnightbsd* | 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 "$gl_cv_func_ptsname_r_retval_ok" in
          *yes) ;;
          *) REPLACE_PTSNAME_R=1 ;;
        esac
        dnl On NetBSD 10.0, when ptsname_r fails with ERANGE, it clobbers the
        dnl result buffer. We don't use an AC_RUN_IFELSE test here, because
        dnl while the bug exists on all platforms, only NetBSD/i386 has the
        dnl files /dev/ptyp[01] on which the bug becomes apparent.
        case "$host_os" in
          netbsd*) 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
            ]GL_MDA_DEFINES],
            [[errno = 0;
              isatty (-1);
              return errno == 0;
            ]])
         ],
         [gl_cv_func_isatty_sets_errno=yes],
         [gl_cv_func_isatty_sets_errno=no],
         [case "$host_os" in
            irix* | solaris*)
              gl_cv_func_isatty_sets_errno="guessing no" ;;
              # Guess yes on mingw, no on MSVC.
            mingw* | windows*)
              AC_EGREP_CPP([Known], [
  #ifdef __MINGW32__
   Known
  #endif
                ],
                [gl_cv_func_isatty_sets_errno="guessing yes"],
                [gl_cv_func_isatty_sets_errno="guessing no"])
              ;;
            *)
              gl_cv_func_isatty_sets_errno="guessing yes" ;;
          esac
         ])
      ])
    case "$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
  ])
  

Download