[PATCH 13/21] posix/bits/unistd.h: Clearly separate declaration from definitions
Siddhesh Poyarekar
siddhesh@gotplt.org
Thu Jun 22 04:17:54 GMT 2023
On 2023-06-20 14:19, Frédéric Bérat wrote:
> This change is similar to what was done for bits/wchar2.h.
> Routines declaration are moved into a dedicated bits/unistd-decl.h file
> which is then included into the bits/unistd.h file.
>
> This will allow to adapt the files so that PLT entries are not created when
> _FORTIFY_SOURCE is enabled.
> ---
> include/bits/unistd-decl.h | 1 +
> include/unistd.h | 1 +
> posix/Makefile | 1 +
> posix/bits/unistd-decl.h | 198 +++++++++++++++++++++++++++++++++++++
> posix/bits/unistd.h | 154 +----------------------------
> 5 files changed, 202 insertions(+), 153 deletions(-)
> create mode 100644 include/bits/unistd-decl.h
> create mode 100644 posix/bits/unistd-decl.h
>
> diff --git a/include/bits/unistd-decl.h b/include/bits/unistd-decl.h
> new file mode 100644
> index 0000000000..7fcbd272ac
> --- /dev/null
> +++ b/include/bits/unistd-decl.h
> @@ -0,0 +1 @@
> +#include <posix/bits/unistd-decl.h>
> diff --git a/include/unistd.h b/include/unistd.h
> index 4345d08d60..b042a485f9 100644
> --- a/include/unistd.h
> +++ b/include/unistd.h
> @@ -5,6 +5,7 @@
>
> # include <stdbool.h>
> # include <kernel-features.h>
> +# include <bits/unistd-decl.h>
>
> libc_hidden_proto (_exit, __noreturn__)
> # ifndef NO_RTLD_HIDDEN
> diff --git a/posix/Makefile b/posix/Makefile
> index 5113ee3b74..3d368b91f6 100644
> --- a/posix/Makefile
> +++ b/posix/Makefile
> @@ -42,6 +42,7 @@ headers := \
> bits/types/idtype_t.h \
> bits/types/struct_sched_param.h \
> bits/typesizes.h \
> + bits/unistd-decl.h \
> bits/unistd.h \
> bits/unistd_ext.h \
> bits/utsname.h \
> diff --git a/posix/bits/unistd-decl.h b/posix/bits/unistd-decl.h
> new file mode 100644
> index 0000000000..440911b20a
> --- /dev/null
> +++ b/posix/bits/unistd-decl.h
> @@ -0,0 +1,198 @@
> +/* Checking routines for unistd functions. Declaration only.
> + Copyright (C) 2023 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
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef _BITS_UNISTD_DECL_H
> +#define _BITS_UNISTD_DECL_H 1
> +
> +#ifndef _UNISTD_H
> +# error "Never include <bits/unistd.h> directly; use <unistd.h> instead."
Never use unistd-decl.h...
> +#endif
> +
> +extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
> + size_t __buflen)
> + __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
> + size_t __nbytes), read)
> + __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __REDIRECT (__read_chk_warn,
> + (int __fd, void *__buf, size_t __nbytes,
> + size_t __buflen), __read_chk)
> + __wur __warnattr ("read called with bigger length than size of "
> + "the destination buffer");
> +
> +#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
> +extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
> + __off_t __offset, size_t __bufsize)
> + __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
> + __off64_t __offset, size_t __bufsize)
> + __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __REDIRECT (__pread_alias,
> + (int __fd, void *__buf, size_t __nbytes,
> + __off_t __offset), pread)
> + __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __REDIRECT (__pread64_alias,
> + (int __fd, void *__buf, size_t __nbytes,
> + __off64_t __offset), pread64)
> + __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __REDIRECT (__pread_chk_warn,
> + (int __fd, void *__buf, size_t __nbytes,
> + __off_t __offset, size_t __bufsize), __pread_chk)
> + __wur __warnattr ("pread called with bigger length than size of "
> + "the destination buffer");
> +extern ssize_t __REDIRECT (__pread64_chk_warn,
> + (int __fd, void *__buf, size_t __nbytes,
> + __off64_t __offset, size_t __bufsize),
> + __pread64_chk)
> + __wur __warnattr ("pread64 called with bigger length than size of "
> + "the destination buffer");
> +#endif
> +
> +#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
> +extern ssize_t __readlink_chk (const char *__restrict __path,
> + char *__restrict __buf, size_t __len,
> + size_t __buflen)
> + __THROW __nonnull ((1, 2)) __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __REDIRECT_NTH (__readlink_alias,
> + (const char *__restrict __path,
> + char *__restrict __buf, size_t __len), readlink)
> + __nonnull ((1, 2)) __wur __attr_access ((__write_only__, 2, 3));
> +extern ssize_t __REDIRECT_NTH (__readlink_chk_warn,
> + (const char *__restrict __path,
> + char *__restrict __buf, size_t __len,
> + size_t __buflen), __readlink_chk)
> + __nonnull ((1, 2)) __wur __warnattr ("readlink called with bigger length "
> + "than size of destination buffer");
> +#endif
> +
> +#ifdef __USE_ATFILE
> +extern ssize_t __readlinkat_chk (int __fd, const char *__restrict __path,
> + char *__restrict __buf, size_t __len,
> + size_t __buflen)
> + __THROW __nonnull ((2, 3)) __wur __attr_access ((__write_only__, 3, 4));
> +extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
> + (int __fd, const char *__restrict __path,
> + char *__restrict __buf, size_t __len),
> + readlinkat)
> + __nonnull ((2, 3)) __wur __attr_access ((__write_only__, 3, 4));
> +extern ssize_t __REDIRECT_NTH (__readlinkat_chk_warn,
> + (int __fd, const char *__restrict __path,
> + char *__restrict __buf, size_t __len,
> + size_t __buflen), __readlinkat_chk)
> + __nonnull ((2, 3)) __wur __warnattr ("readlinkat called with bigger "
> + "length than size of destination "
> + "buffer");
> +#endif
> +
> +extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
> + __THROW __wur;
> +extern char *__REDIRECT_NTH (__getcwd_alias,
> + (char *__buf, size_t __size), getcwd) __wur;
> +extern char *__REDIRECT_NTH (__getcwd_chk_warn,
> + (char *__buf, size_t __size, size_t __buflen),
> + __getcwd_chk)
> + __wur __warnattr ("getcwd caller with bigger length than size of "
> + "destination buffer");
> +
> +#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
> +extern char *__getwd_chk (char *__buf, size_t buflen)
> + __THROW __nonnull ((1)) __wur __attr_access ((__write_only__, 1, 2));
> +extern char *__REDIRECT_NTH (__getwd_warn, (char *__buf), getwd)
> + __nonnull ((1)) __wur __warnattr ("please use getcwd instead, as getwd "
> + "doesn't specify buffer size");
> +#endif
> +
> +extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
> + size_t __buflen) __THROW
> + __attr_access ((__write_only__, 2, 3));
> +extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
> + size_t __len), confstr)
> + __attr_access ((__write_only__, 2, 3));
> +extern size_t __REDIRECT_NTH (__confstr_chk_warn,
> + (int __name, char *__buf, size_t __len,
> + size_t __buflen), __confstr_chk)
> + __warnattr ("confstr called with bigger length than size of destination "
> + "buffer");
> +
> +
> +extern int __getgroups_chk (int __size, __gid_t __list[], size_t __listlen)
> + __THROW __wur __attr_access ((__write_only__, 2, 1));
> +extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
> + getgroups) __wur __attr_access ((__write_only__, 2, 1));
> +extern int __REDIRECT_NTH (__getgroups_chk_warn,
> + (int __size, __gid_t __list[], size_t __listlen),
> + __getgroups_chk)
> + __wur __warnattr ("getgroups called with bigger group count than what "
> + "can fit into destination buffer");
> +
> +
> +extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
> + size_t __nreal) __THROW __nonnull ((2))
> + __attr_access ((__write_only__, 2, 3));
> +extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
> + size_t __buflen), ttyname_r)
> + __nonnull ((2));
> +extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
> + (int __fd, char *__buf, size_t __buflen,
> + size_t __nreal), __ttyname_r_chk)
> + __nonnull ((2)) __warnattr ("ttyname_r called with bigger buflen than "
> + "size of destination buffer");
> +
> +
> +#ifdef __USE_POSIX199506
> +extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
> + __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
> +extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
> + getlogin_r) __nonnull ((1));
> +extern int __REDIRECT (__getlogin_r_chk_warn,
> + (char *__buf, size_t __buflen, size_t __nreal),
> + __getlogin_r_chk)
> + __nonnull ((1)) __warnattr ("getlogin_r called with bigger buflen than "
> + "size of destination buffer");
> +#endif
> +
> +
> +#if defined __USE_MISC || defined __USE_UNIX98
> +extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
> + __THROW __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
> +extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
> + gethostname)
> + __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
> +extern int __REDIRECT_NTH (__gethostname_chk_warn,
> + (char *__buf, size_t __buflen, size_t __nreal),
> + __gethostname_chk)
> + __nonnull ((1)) __warnattr ("gethostname called with bigger buflen than "
> + "size of destination buffer");
> +#endif
> +
> +
> +#if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_UNIX98)
> +extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
> + __THROW __nonnull ((1)) __wur __attr_access ((__write_only__, 1, 2));
> +extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
> + size_t __buflen),
> + getdomainname) __nonnull ((1))
> + __wur __attr_access ((__write_only__, 1, 2));
> +extern int __REDIRECT_NTH (__getdomainname_chk_warn,
> + (char *__buf, size_t __buflen, size_t __nreal),
> + __getdomainname_chk)
> + __nonnull ((1)) __wur __warnattr ("getdomainname called with bigger "
> + "buflen than size of destination "
> + "buffer");
> +#endif
> +#endif /* bits/unistd-decl.h. */
> diff --git a/posix/bits/unistd.h b/posix/bits/unistd.h
> index 2a0782e6c8..6a381116a9 100644
> --- a/posix/bits/unistd.h
> +++ b/posix/bits/unistd.h
> @@ -20,17 +20,7 @@
> # error "Never include <bits/unistd.h> directly; use <unistd.h> instead."
> #endif
>
> -extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
> - size_t __buflen)
> - __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
> - size_t __nbytes), read)
> - __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __REDIRECT (__read_chk_warn,
> - (int __fd, void *__buf, size_t __nbytes,
> - size_t __buflen), __read_chk)
> - __wur __warnattr ("read called with bigger length than size of "
> - "the destination buffer");
> +# include <bits/unistd-decl.h>
>
> __fortify_function __wur ssize_t
> read (int __fd, void *__buf, size_t __nbytes)
> @@ -41,32 +31,6 @@ read (int __fd, void *__buf, size_t __nbytes)
> }
>
> #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
> -extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
> - __off_t __offset, size_t __bufsize)
> - __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
> - __off64_t __offset, size_t __bufsize)
> - __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __REDIRECT (__pread_alias,
> - (int __fd, void *__buf, size_t __nbytes,
> - __off_t __offset), pread)
> - __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __REDIRECT (__pread64_alias,
> - (int __fd, void *__buf, size_t __nbytes,
> - __off64_t __offset), pread64)
> - __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __REDIRECT (__pread_chk_warn,
> - (int __fd, void *__buf, size_t __nbytes,
> - __off_t __offset, size_t __bufsize), __pread_chk)
> - __wur __warnattr ("pread called with bigger length than size of "
> - "the destination buffer");
> -extern ssize_t __REDIRECT (__pread64_chk_warn,
> - (int __fd, void *__buf, size_t __nbytes,
> - __off64_t __offset, size_t __bufsize),
> - __pread64_chk)
> - __wur __warnattr ("pread64 called with bigger length than size of "
> - "the destination buffer");
> -
> # ifndef __USE_FILE_OFFSET64
> __fortify_function __wur ssize_t
> pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
> @@ -97,21 +61,6 @@ pread64 (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
> #endif
>
> #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
> -extern ssize_t __readlink_chk (const char *__restrict __path,
> - char *__restrict __buf, size_t __len,
> - size_t __buflen)
> - __THROW __nonnull ((1, 2)) __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __REDIRECT_NTH (__readlink_alias,
> - (const char *__restrict __path,
> - char *__restrict __buf, size_t __len), readlink)
> - __nonnull ((1, 2)) __wur __attr_access ((__write_only__, 2, 3));
> -extern ssize_t __REDIRECT_NTH (__readlink_chk_warn,
> - (const char *__restrict __path,
> - char *__restrict __buf, size_t __len,
> - size_t __buflen), __readlink_chk)
> - __nonnull ((1, 2)) __wur __warnattr ("readlink called with bigger length "
> - "than size of destination buffer");
> -
> __fortify_function __nonnull ((1, 2)) __wur ssize_t
> __NTH (readlink (const char *__restrict __path, char *__restrict __buf,
> size_t __len))
> @@ -123,23 +72,6 @@ __NTH (readlink (const char *__restrict __path, char *__restrict __buf,
> #endif
>
> #ifdef __USE_ATFILE
> -extern ssize_t __readlinkat_chk (int __fd, const char *__restrict __path,
> - char *__restrict __buf, size_t __len,
> - size_t __buflen)
> - __THROW __nonnull ((2, 3)) __wur __attr_access ((__write_only__, 3, 4));
> -extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
> - (int __fd, const char *__restrict __path,
> - char *__restrict __buf, size_t __len),
> - readlinkat)
> - __nonnull ((2, 3)) __wur __attr_access ((__write_only__, 3, 4));
> -extern ssize_t __REDIRECT_NTH (__readlinkat_chk_warn,
> - (int __fd, const char *__restrict __path,
> - char *__restrict __buf, size_t __len,
> - size_t __buflen), __readlinkat_chk)
> - __nonnull ((2, 3)) __wur __warnattr ("readlinkat called with bigger "
> - "length than size of destination "
> - "buffer");
> -
> __fortify_function __nonnull ((2, 3)) __wur ssize_t
> __NTH (readlinkat (int __fd, const char *__restrict __path,
> char *__restrict __buf, size_t __len))
> @@ -150,16 +82,6 @@ __NTH (readlinkat (int __fd, const char *__restrict __path,
> }
> #endif
>
> -extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
> - __THROW __wur;
> -extern char *__REDIRECT_NTH (__getcwd_alias,
> - (char *__buf, size_t __size), getcwd) __wur;
> -extern char *__REDIRECT_NTH (__getcwd_chk_warn,
> - (char *__buf, size_t __size, size_t __buflen),
> - __getcwd_chk)
> - __wur __warnattr ("getcwd caller with bigger length than size of "
> - "destination buffer");
> -
> __fortify_function __wur char *
> __NTH (getcwd (char *__buf, size_t __size))
> {
> @@ -169,12 +91,6 @@ __NTH (getcwd (char *__buf, size_t __size))
> }
>
> #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
> -extern char *__getwd_chk (char *__buf, size_t buflen)
> - __THROW __nonnull ((1)) __wur __attr_access ((__write_only__, 1, 2));
> -extern char *__REDIRECT_NTH (__getwd_warn, (char *__buf), getwd)
> - __nonnull ((1)) __wur __warnattr ("please use getcwd instead, as getwd "
> - "doesn't specify buffer size");
> -
> __fortify_function __nonnull ((1)) __attribute_deprecated__ __wur char *
> __NTH (getwd (char *__buf))
> {
> @@ -184,18 +100,6 @@ __NTH (getwd (char *__buf))
> }
> #endif
>
> -extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
> - size_t __buflen) __THROW
> - __attr_access ((__write_only__, 2, 3));
> -extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
> - size_t __len), confstr)
> - __attr_access ((__write_only__, 2, 3));
> -extern size_t __REDIRECT_NTH (__confstr_chk_warn,
> - (int __name, char *__buf, size_t __len,
> - size_t __buflen), __confstr_chk)
> - __warnattr ("confstr called with bigger length than size of destination "
> - "buffer");
> -
> __fortify_function size_t
> __NTH (confstr (int __name, char *__buf, size_t __len))
> {
> @@ -205,16 +109,6 @@ __NTH (confstr (int __name, char *__buf, size_t __len))
> }
>
>
> -extern int __getgroups_chk (int __size, __gid_t __list[], size_t __listlen)
> - __THROW __wur __attr_access ((__write_only__, 2, 1));
> -extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
> - getgroups) __wur __attr_access ((__write_only__, 2, 1));
> -extern int __REDIRECT_NTH (__getgroups_chk_warn,
> - (int __size, __gid_t __list[], size_t __listlen),
> - __getgroups_chk)
> - __wur __warnattr ("getgroups called with bigger group count than what "
> - "can fit into destination buffer");
> -
> __fortify_function int
> __NTH (getgroups (int __size, __gid_t __list[]))
> {
> @@ -224,18 +118,6 @@ __NTH (getgroups (int __size, __gid_t __list[]))
> }
>
>
> -extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
> - size_t __nreal) __THROW __nonnull ((2))
> - __attr_access ((__write_only__, 2, 3));
> -extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
> - size_t __buflen), ttyname_r)
> - __nonnull ((2));
> -extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
> - (int __fd, char *__buf, size_t __buflen,
> - size_t __nreal), __ttyname_r_chk)
> - __nonnull ((2)) __warnattr ("ttyname_r called with bigger buflen than "
> - "size of destination buffer");
> -
> __fortify_function int
> __NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
> {
> @@ -246,16 +128,6 @@ __NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
>
>
> #ifdef __USE_POSIX199506
> -extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
> - __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
> -extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
> - getlogin_r) __nonnull ((1));
> -extern int __REDIRECT (__getlogin_r_chk_warn,
> - (char *__buf, size_t __buflen, size_t __nreal),
> - __getlogin_r_chk)
> - __nonnull ((1)) __warnattr ("getlogin_r called with bigger buflen than "
> - "size of destination buffer");
> -
> __fortify_function int
> getlogin_r (char *__buf, size_t __buflen)
> {
> @@ -267,17 +139,6 @@ getlogin_r (char *__buf, size_t __buflen)
>
>
> #if defined __USE_MISC || defined __USE_UNIX98
> -extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
> - __THROW __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
> -extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
> - gethostname)
> - __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
> -extern int __REDIRECT_NTH (__gethostname_chk_warn,
> - (char *__buf, size_t __buflen, size_t __nreal),
> - __gethostname_chk)
> - __nonnull ((1)) __warnattr ("gethostname called with bigger buflen than "
> - "size of destination buffer");
> -
> __fortify_function int
> __NTH (gethostname (char *__buf, size_t __buflen))
> {
> @@ -289,19 +150,6 @@ __NTH (gethostname (char *__buf, size_t __buflen))
>
>
> #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_UNIX98)
> -extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
> - __THROW __nonnull ((1)) __wur __attr_access ((__write_only__, 1, 2));
> -extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
> - size_t __buflen),
> - getdomainname) __nonnull ((1))
> - __wur __attr_access ((__write_only__, 1, 2));
> -extern int __REDIRECT_NTH (__getdomainname_chk_warn,
> - (char *__buf, size_t __buflen, size_t __nreal),
> - __getdomainname_chk)
> - __nonnull ((1)) __wur __warnattr ("getdomainname called with bigger "
> - "buflen than size of destination "
> - "buffer");
> -
> __fortify_function int
> __NTH (getdomainname (char *__buf, size_t __buflen))
> {
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