mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
293 lines
8.8 KiB
C
293 lines
8.8 KiB
C
/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <stddef.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <confstr.h>
|
|
#include "../version.h"
|
|
|
|
#define NEED_SPEC_ARRAY 0
|
|
#include <posix-conf-vars.h>
|
|
|
|
/* If BUF is not NULL and LEN > 0, fill in at most LEN - 1 bytes
|
|
of BUF with the value corresponding to NAME and zero-terminate BUF.
|
|
Return the number of bytes required to hold NAME's entire value. */
|
|
size_t
|
|
confstr (int name, char *buf, size_t len)
|
|
{
|
|
const char *string = "";
|
|
size_t string_len = 1;
|
|
|
|
/* Note that this buffer must be large enough for the longest strings
|
|
used below. */
|
|
char restenvs[4 * sizeof "POSIX_V7_LPBIG_OFFBIG"];
|
|
|
|
switch (name)
|
|
{
|
|
case _CS_PATH:
|
|
{
|
|
static const char cs_path[] = CS_PATH;
|
|
string = cs_path;
|
|
string_len = sizeof (cs_path);
|
|
}
|
|
break;
|
|
|
|
/* For _CS_V7_WIDTH_RESTRICTED_ENVS, _CS_V6_WIDTH_RESTRICTED_ENVS
|
|
and _CS_V5_WIDTH_RESTRICTED_ENVS:
|
|
|
|
We have to return a newline-separated list of names of
|
|
programming environments in which the widths of blksize_t,
|
|
cc_t, mode_t, nfds_t, pid_t, ptrdiff_t, size_t, speed_t,
|
|
ssize_t, suseconds_t, tcflag_t, useconds_t, wchar_t, and
|
|
wint_t types are no greater than the width of type long.
|
|
|
|
Currently this means all environments that the system allows. */
|
|
|
|
#define START_ENV_GROUP(VERSION) \
|
|
case _CS_##VERSION##_WIDTH_RESTRICTED_ENVS: \
|
|
string_len = 0;
|
|
|
|
#define END_ENV_GROUP(VERSION) \
|
|
restenvs[string_len++] = '\0'; \
|
|
string = restenvs; \
|
|
break;
|
|
|
|
#define KNOWN_ABSENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
|
|
/* Empty. */
|
|
|
|
#define KNOWN_PRESENT_ENV_STRING(STR) \
|
|
if (string_len > 0) \
|
|
restenvs[string_len++] = '\n'; \
|
|
memcpy (restenvs + string_len, STR, \
|
|
sizeof STR - 1); \
|
|
string_len += sizeof STR - 1;
|
|
|
|
#define KNOWN_PRESENT_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
|
|
KNOWN_PRESENT_ENV_STRING (#ENV_PREFIX "_" #SUFFIX)
|
|
|
|
#define UNKNOWN_ENVIRONMENT(SC_PREFIX, ENV_PREFIX, SUFFIX) \
|
|
if (__sysconf (_SC_##SC_PREFIX##_##SUFFIX) > 0) \
|
|
{ \
|
|
KNOWN_PRESENT_ENVIRONMENT (SC_PREFIX, ENV_PREFIX, SUFFIX) \
|
|
}
|
|
|
|
#include "posix-envs.def"
|
|
|
|
#undef START_ENV_GROUP
|
|
#undef END_ENV_GROUP
|
|
#undef KNOWN_ABSENT_ENVIRONMENT
|
|
#undef KNOWN_PRESENT_ENV_STRING
|
|
#undef KNOWN_PRESENT_ENVIRONMENT
|
|
#undef UNKNOWN_ENVIRONMENT
|
|
|
|
case _CS_XBS5_ILP32_OFF32_CFLAGS:
|
|
case _CS_POSIX_V6_ILP32_OFF32_CFLAGS:
|
|
case _CS_POSIX_V7_ILP32_OFF32_CFLAGS:
|
|
#ifdef __ILP32_OFF32_CFLAGS
|
|
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32)
|
|
# error "__ILP32_OFF32_CFLAGS should not be defined"
|
|
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
|
|
if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
|
|
break;
|
|
# endif
|
|
string = __ILP32_OFF32_CFLAGS;
|
|
string_len = sizeof (__ILP32_OFF32_CFLAGS);
|
|
#endif
|
|
break;
|
|
|
|
case _CS_XBS5_ILP32_OFFBIG_CFLAGS:
|
|
case _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS:
|
|
case _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS:
|
|
#ifdef __ILP32_OFFBIG_CFLAGS
|
|
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
|
|
# error "__ILP32_OFFBIG_CFLAGS should not be defined"
|
|
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
|
|
if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
|
|
break;
|
|
# endif
|
|
string = __ILP32_OFFBIG_CFLAGS;
|
|
string_len = sizeof (__ILP32_OFFBIG_CFLAGS);
|
|
#endif
|
|
break;
|
|
|
|
case _CS_XBS5_LP64_OFF64_CFLAGS:
|
|
case _CS_POSIX_V6_LP64_OFF64_CFLAGS:
|
|
case _CS_POSIX_V7_LP64_OFF64_CFLAGS:
|
|
#ifdef __LP64_OFF64_CFLAGS
|
|
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
|
|
# error "__LP64_OFF64_CFLAGS should not be defined"
|
|
# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
|
|
if (__sysconf (_SC_V7_LP64_OFF64) < 0)
|
|
break;
|
|
# endif
|
|
string = __LP64_OFF64_CFLAGS;
|
|
string_len = sizeof (__LP64_OFF64_CFLAGS);
|
|
#endif
|
|
break;
|
|
|
|
case _CS_XBS5_ILP32_OFF32_LDFLAGS:
|
|
case _CS_POSIX_V6_ILP32_OFF32_LDFLAGS:
|
|
case _CS_POSIX_V7_ILP32_OFF32_LDFLAGS:
|
|
#ifdef __ILP32_OFF32_LDFLAGS
|
|
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFF32 )
|
|
# error "__ILP32_OFF32_LDFLAGS should not be defined"
|
|
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFF32)
|
|
if (__sysconf (_SC_V7_ILP32_OFF32) < 0)
|
|
break;
|
|
# endif
|
|
string = __ILP32_OFF32_LDFLAGS;
|
|
string_len = sizeof (__ILP32_OFF32_LDFLAGS);
|
|
#endif
|
|
break;
|
|
|
|
case _CS_XBS5_ILP32_OFFBIG_LDFLAGS:
|
|
case _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS:
|
|
case _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS:
|
|
#ifdef __ILP32_OFFBIG_LDFLAGS
|
|
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_ILP32_OFFBIG)
|
|
# error "__ILP32_OFFBIG_LDFLAGS should not be defined"
|
|
# elif CONF_IS_UNDEFINED (_POSIX_V7_ILP32_OFFBIG)
|
|
if (__sysconf (_SC_V7_ILP32_OFFBIG) < 0)
|
|
break;
|
|
# endif
|
|
string = __ILP32_OFFBIG_LDFLAGS;
|
|
string_len = sizeof (__ILP32_OFFBIG_LDFLAGS);
|
|
#endif
|
|
break;
|
|
|
|
case _CS_XBS5_LP64_OFF64_LDFLAGS:
|
|
case _CS_POSIX_V6_LP64_OFF64_LDFLAGS:
|
|
case _CS_POSIX_V7_LP64_OFF64_LDFLAGS:
|
|
#ifdef __LP64_OFF64_LDFLAGS
|
|
# if CONF_IS_DEFINED_UNSET (_POSIX_V7_LP64_OFF64)
|
|
# error "__LP64_OFF64_LDFLAGS should not be defined"
|
|
# elif CONF_IS_UNDEFINED (_POSIX_V7_LP64_OFF64)
|
|
if (__sysconf (_SC_V7_LP64_OFF64) < 0)
|
|
break;
|
|
# endif
|
|
string = __LP64_OFF64_LDFLAGS;
|
|
string_len = sizeof (__LP64_OFF64_LDFLAGS);
|
|
#endif
|
|
break;
|
|
|
|
case _CS_LFS_CFLAGS:
|
|
case _CS_LFS_LINTFLAGS:
|
|
#if (CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFF32) \
|
|
&& CONF_IS_DEFINED_SET (_POSIX_V6_ILP32_OFFBIG))
|
|
# define __LFS_CFLAGS "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
|
|
/* Signal that we want the new ABI. */
|
|
string = __LFS_CFLAGS;
|
|
string_len = sizeof (__LFS_CFLAGS);
|
|
#endif
|
|
break;
|
|
|
|
case _CS_LFS_LDFLAGS:
|
|
case _CS_LFS_LIBS:
|
|
/* No special libraries or linker flags needed. */
|
|
break;
|
|
|
|
case _CS_LFS64_CFLAGS:
|
|
case _CS_LFS64_LINTFLAGS:
|
|
#define __LFS64_CFLAGS "-D_LARGEFILE64_SOURCE"
|
|
string = __LFS64_CFLAGS;
|
|
string_len = sizeof (__LFS64_CFLAGS);
|
|
break;
|
|
|
|
case _CS_LFS64_LDFLAGS:
|
|
case _CS_LFS64_LIBS:
|
|
/* No special libraries or linker flags needed. */
|
|
break;
|
|
|
|
case _CS_XBS5_ILP32_OFF32_LIBS:
|
|
case _CS_XBS5_ILP32_OFF32_LINTFLAGS:
|
|
case _CS_XBS5_ILP32_OFFBIG_LIBS:
|
|
case _CS_XBS5_ILP32_OFFBIG_LINTFLAGS:
|
|
case _CS_XBS5_LP64_OFF64_LIBS:
|
|
case _CS_XBS5_LP64_OFF64_LINTFLAGS:
|
|
case _CS_XBS5_LPBIG_OFFBIG_CFLAGS:
|
|
case _CS_XBS5_LPBIG_OFFBIG_LDFLAGS:
|
|
case _CS_XBS5_LPBIG_OFFBIG_LIBS:
|
|
case _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS:
|
|
|
|
case _CS_POSIX_V6_ILP32_OFF32_LIBS:
|
|
case _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS:
|
|
case _CS_POSIX_V6_ILP32_OFFBIG_LIBS:
|
|
case _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS:
|
|
case _CS_POSIX_V6_LP64_OFF64_LIBS:
|
|
case _CS_POSIX_V6_LP64_OFF64_LINTFLAGS:
|
|
case _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS:
|
|
case _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS:
|
|
case _CS_POSIX_V6_LPBIG_OFFBIG_LIBS:
|
|
case _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS:
|
|
|
|
case _CS_POSIX_V7_ILP32_OFF32_LIBS:
|
|
case _CS_POSIX_V7_ILP32_OFF32_LINTFLAGS:
|
|
case _CS_POSIX_V7_ILP32_OFFBIG_LIBS:
|
|
case _CS_POSIX_V7_ILP32_OFFBIG_LINTFLAGS:
|
|
case _CS_POSIX_V7_LP64_OFF64_LIBS:
|
|
case _CS_POSIX_V7_LP64_OFF64_LINTFLAGS:
|
|
case _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS:
|
|
case _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS:
|
|
case _CS_POSIX_V7_LPBIG_OFFBIG_LIBS:
|
|
case _CS_POSIX_V7_LPBIG_OFFBIG_LINTFLAGS:
|
|
/* GNU libc does not require special actions to use LFS functions. */
|
|
break;
|
|
|
|
case _CS_GNU_LIBC_VERSION:
|
|
string = "glibc " VERSION;
|
|
string_len = sizeof ("glibc " VERSION);
|
|
break;
|
|
|
|
case _CS_GNU_LIBPTHREAD_VERSION:
|
|
#ifdef LIBPTHREAD_VERSION
|
|
string = LIBPTHREAD_VERSION;
|
|
string_len = sizeof LIBPTHREAD_VERSION;
|
|
break;
|
|
#else
|
|
/* No thread library. */
|
|
__set_errno (EINVAL);
|
|
return 0;
|
|
#endif
|
|
|
|
case _CS_V6_ENV:
|
|
case _CS_V7_ENV:
|
|
/* Maybe something else is needed in future. */
|
|
string = "POSIXLY_CORRECT=1";
|
|
string_len = sizeof ("POSIXLY_CORRECT=1");
|
|
break;
|
|
|
|
default:
|
|
__set_errno (EINVAL);
|
|
return 0;
|
|
}
|
|
|
|
if (len > 0 && buf != NULL)
|
|
{
|
|
if (string_len <= len)
|
|
memcpy (buf, string, string_len);
|
|
else
|
|
{
|
|
memcpy (buf, string, len - 1);
|
|
buf[len - 1] = '\0';
|
|
}
|
|
}
|
|
return string_len;
|
|
}
|
|
libc_hidden_def (confstr)
|