kc3-lang/gnulib/m4/stdlib_h.m4

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• Hash : 8dffeb6f
  Author :
  Date : 2009-11-14T22:13:10
  

  setenv, unsetenv: work around various bugs
  
  POSIX requires setenv(NULL,"",0), setenv("a=b","",0),
  unsetenv(NULL), and unsetenv("a=b") to fail with EINVAL, but
  many BSD implementations lack validation.  The gnulib
  replacement for void unsetenv did not do validation, and the
  replacement for setenv was out of sync with glibc.  Also, some
  BSD implementations of setenv("a","==",1) eat the leading '='.
  
  See also some recent Austin Group interpretations on environ:
  http://austingroupbugs.net/view.php?id=167
  http://austingroupbugs.net/view.php?id=185
  
  * lib/setenv.c (setenv) [!HAVE_SETENV]: Resync from glibc.
  (setenv) [HAVE_SETENV]: Work around bugs.
  * lib/unsetenv.c (unsetenv) [HAVE_UNSETENV]: Work around bugs.
  * m4/setenv.m4 (gl_FUNC_SETENV_SEPARATE, gl_FUNC_UNSETENV): Check
  for bugs.
  (gl_FUNC_SETENV): Write in terms of gl_FUNC_SETENV_SEPARATE.
  * m4/environ.m4 (gl_ENVIRON): Avoid expand-before-require.
  * m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Update defaults.
  * modules/stdlib (Makefile.am): Update substitutions.
  * lib/stdlib.in.h (setenv, unsetenv): Update prototypes.
  * doc/posix-functions/setenv.texi (setenv): Document the bugs.
  * doc/posix-functions/unsetenv.texi (unsetenv): Likewise.
  * modules/setenv-tests: New test.
  * modules/unsetenv-tests: Likewise.
  * tests/test-setenv.c: New file.
  * tests/test-unsetenv.c: Likewise.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• m4/stdlib_h.m4

• # stdlib_h.m4 serial 21
  dnl Copyright (C) 2007-2009 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_STDLIB_H],
  [
    AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
    gl_CHECK_NEXT_HEADERS([stdlib.h])
    AC_CHECK_HEADERS([random.h], [], [], [AC_INCLUDES_DEFAULT])
    if test $ac_cv_header_random_h = yes; then
      HAVE_RANDOM_H=1
    else
      HAVE_RANDOM_H=0
    fi
    AC_SUBST([HAVE_RANDOM_H])
    AC_CHECK_TYPES([struct random_data],
      [], [HAVE_STRUCT_RANDOM_DATA=0],
      [[#include <stdlib.h>
        #if HAVE_RANDOM_H
        # include <random.h>
        #endif
      ]])
  ])
  
  AC_DEFUN([gl_STDLIB_MODULE_INDICATOR],
  [
    dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
    AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
    GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
  ])
  
  AC_DEFUN([gl_STDLIB_H_DEFAULTS],
  [
    GNULIB_ATOLL=0;         AC_SUBST([GNULIB_ATOLL])
    GNULIB_CALLOC_POSIX=0;  AC_SUBST([GNULIB_CALLOC_POSIX])
    GNULIB_CANONICALIZE_FILE_NAME=0;  AC_SUBST([GNULIB_CANONICALIZE_FILE_NAME])
    GNULIB_GETLOADAVG=0;    AC_SUBST([GNULIB_GETLOADAVG])
    GNULIB_GETSUBOPT=0;     AC_SUBST([GNULIB_GETSUBOPT])
    GNULIB_MALLOC_POSIX=0;  AC_SUBST([GNULIB_MALLOC_POSIX])
    GNULIB_MKDTEMP=0;       AC_SUBST([GNULIB_MKDTEMP])
    GNULIB_MKOSTEMP=0;      AC_SUBST([GNULIB_MKOSTEMP])
    GNULIB_MKOSTEMPS=0;     AC_SUBST([GNULIB_MKOSTEMPS])
    GNULIB_MKSTEMP=0;       AC_SUBST([GNULIB_MKSTEMP])
    GNULIB_MKSTEMPS=0;      AC_SUBST([GNULIB_MKSTEMPS])
    GNULIB_PUTENV=0;        AC_SUBST([GNULIB_PUTENV])
    GNULIB_RANDOM_R=0;      AC_SUBST([GNULIB_RANDOM_R])
    GNULIB_REALLOC_POSIX=0; AC_SUBST([GNULIB_REALLOC_POSIX])
    GNULIB_REALPATH=0;      AC_SUBST([GNULIB_REALPATH])
    GNULIB_RPMATCH=0;       AC_SUBST([GNULIB_RPMATCH])
    GNULIB_SETENV=0;        AC_SUBST([GNULIB_SETENV])
    GNULIB_STRTOD=0;        AC_SUBST([GNULIB_STRTOD])
    GNULIB_STRTOLL=0;       AC_SUBST([GNULIB_STRTOLL])
    GNULIB_STRTOULL=0;      AC_SUBST([GNULIB_STRTOULL])
    GNULIB_UNSETENV=0;      AC_SUBST([GNULIB_UNSETENV])
    dnl Assume proper GNU behavior unless another module says otherwise.
    HAVE_ATOLL=1;              AC_SUBST([HAVE_ATOLL])
    HAVE_CALLOC_POSIX=1;       AC_SUBST([HAVE_CALLOC_POSIX])
    HAVE_CANONICALIZE_FILE_NAME=1;  AC_SUBST([HAVE_CANONICALIZE_FILE_NAME])
    HAVE_DECL_GETLOADAVG=1;    AC_SUBST([HAVE_DECL_GETLOADAVG])
    HAVE_GETSUBOPT=1;          AC_SUBST([HAVE_GETSUBOPT])
    HAVE_MALLOC_POSIX=1;       AC_SUBST([HAVE_MALLOC_POSIX])
    HAVE_MKDTEMP=1;            AC_SUBST([HAVE_MKDTEMP])
    HAVE_MKOSTEMP=1;           AC_SUBST([HAVE_MKOSTEMP])
    HAVE_MKOSTEMPS=1;          AC_SUBST([HAVE_MKOSTEMPS])
    HAVE_MKSTEMPS=1;           AC_SUBST([HAVE_MKSTEMPS])
    HAVE_RANDOM_R=1;           AC_SUBST([HAVE_RANDOM_R])
    HAVE_REALLOC_POSIX=1;      AC_SUBST([HAVE_REALLOC_POSIX])
    HAVE_REALPATH=1;           AC_SUBST([HAVE_REALPATH])
    HAVE_RPMATCH=1;            AC_SUBST([HAVE_RPMATCH])
    HAVE_SETENV=1;             AC_SUBST([HAVE_SETENV])
    HAVE_STRTOD=1;             AC_SUBST([HAVE_STRTOD])
    HAVE_STRTOLL=1;            AC_SUBST([HAVE_STRTOLL])
    HAVE_STRTOULL=1;           AC_SUBST([HAVE_STRTOULL])
    HAVE_STRUCT_RANDOM_DATA=1; AC_SUBST([HAVE_STRUCT_RANDOM_DATA])
    HAVE_SYS_LOADAVG_H=0;      AC_SUBST([HAVE_SYS_LOADAVG_H])
    HAVE_UNSETENV=1;           AC_SUBST([HAVE_UNSETENV])
    REPLACE_CANONICALIZE_FILE_NAME=0;  AC_SUBST([REPLACE_CANONICALIZE_FILE_NAME])
    REPLACE_MKSTEMP=0;         AC_SUBST([REPLACE_MKSTEMP])
    REPLACE_PUTENV=0;          AC_SUBST([REPLACE_PUTENV])
    REPLACE_REALPATH=0;        AC_SUBST([REPLACE_REALPATH])
    REPLACE_SETENV=0;          AC_SUBST([REPLACE_SETENV])
    REPLACE_STRTOD=0;          AC_SUBST([REPLACE_STRTOD])
    REPLACE_UNSETENV=0;        AC_SUBST([REPLACE_UNSETENV])
  ])
  

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