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5c5c0dd747
The llseek function name is an obsolete, Linux-specific, unprototyped name for lseek64 with a link-time warning. This patch completes the obsoletion of this function name by making it into a compat symbol, not available for newly linked programs and not included in the ABI for new ports. When a compat symbol is defined in syscalls.list, the code for that function is not built at all for static linking unless some non-compat symbol for that function is also defined with an explicit symbol version, so an explicit symbol version for lseek64 is added to the MIPS n32 syscalls.list. The case in make-syscalls.sh that handles such explicit non-compat symbol versions then needs to be changed to use weak_alias instead of strong_alias when the syscall is built outside of libc, to avoid linknamespace failures from a strong lseek64 symbol in static libpthread. The x32 llseek.S was as far as I could tell already unused (nothing builds an llseek.* source file, at least since the lseek / lseek64 / llseek consolidation), so is removed in this patch as well. Tested for x86_64 and x86, and with build-many-glibcs.py. [BZ #18471] * sysdeps/unix/make-syscalls.sh (emit_weak_aliases): Use weak aliases for non-libc case of versioned symbols. * sysdeps/unix/sysv/linux/lseek64.c: Include <shlib-compat.h>. (llseek): Define as compat symbol if [SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_28)], not as weak alias with link warning. * sysdeps/unix/sysv/linux/mips/mips64/n32/syscalls.list (llseek): Make into a compat symbol, disabled for minimum symbol version GLIBC_2.28 and later. * sysdeps/unix/sysv/linux/x86_64/x32/llseek.S: Remove file.
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* Linux lseek implementation, 64 bits off_t.
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Copyright (C) 2016-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sysdep.h>
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#include <errno.h>
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#include <shlib-compat.h>
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off64_t
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__lseek64 (int fd, off64_t offset, int whence)
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{
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#ifdef __NR__llseek
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loff_t res;
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int rc = INLINE_SYSCALL_CALL (_llseek, fd,
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(long) (((uint64_t) (offset)) >> 32),
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(long) offset, &res, whence);
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return rc ?: res;
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#else
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return INLINE_SYSCALL_CALL (lseek, fd, offset, whence);
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#endif
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}
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#ifdef __OFF_T_MATCHES_OFF64_T
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weak_alias (__lseek64, lseek)
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weak_alias (__lseek64, __lseek)
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strong_alias (__lseek64, __libc_lseek)
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libc_hidden_def (__lseek)
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#endif
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strong_alias (__lseek64, __libc_lseek64)
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weak_alias (__lseek64, lseek64)
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_28)
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strong_alias (__lseek64, __compat_llseek)
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compat_symbol (libc, __compat_llseek, llseek, GLIBC_2_0);
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#endif
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