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Consolidate lseek/lseek64/llseek implementations
This patch consolidates all Linux lseek/lseek64/llseek implementation in on on sysdeps/unix/sysv/linux/lseek{64}.c. It also removes the llseek file and instead consolidate the LFS lseek implementation on lseek64.c as for other LFS symbols implementations. The general idea is: - lseek: ABIs that not define __OFF_T_MATCHES_OFF64_T will preferable use __NR__llseek if kernel supports it, otherwise they will use __NR_lseek. ABIs that defines __OFF_T_MATCHES_OFF64_T won't produce any symbol. - lseek64: ABIs with __OFF_T_MATCHES_OFF64_T will preferable use __NR_lseek (since it will use 64-bit arguments without low/high splitting) and __NR__llseek if __NR_lseek is not defined (for some ILP32 ports). - llseek: files will be removed and symbols will be aliased ot lseek64. ABI without __OFF_T_MATCHES_OFF64_T and without __NR_llseek (basically MIPS64n32 so far) are covered by building lseek with off_t as expected and lseek64 using __NR_lseek (as expected for off64_t being passed using 64-bit registers). For this consolidation I mantained the x32 assembly specific implementation because to correctly fix this it would required both the x32 fix for {INLINE,INTERNAL}_SYSCALL [1] and a wrapper to correctly subscribe it to return 64 bits instead of default 32 bits (as for times). It could a future cleanup. It is based on my previous {INTERNAL,INLINE}_SYSCALL_CALL macro [2], although it is mainly for simplification. Tested on x86_64, i686, aarch64, armhf, and powerpc64le. * nptl/Makefile (libpthread-routines): Remove ptw-llseek and add ptw-lseek64. * sysdeps/unix/sysv/linux/Makefile (sysdeps_routines): Remove llseek. * sysdeps/unix/sysv/linux/alpha/Makefile (sysdeps_routines): Likewise. * sysdeps/unix/sysv/linux/generic/wordsize-32/llseek.c: Remove file. * sysdeps/unix/sysv/linux/generic/wordsize-32/lseek.c: Remove file. * sysdeps/unix/sysv/linux/mips/mips64/llseek.c: Likewise. * sysdeps/unix/sysv/linux/llseek.c: Remove file. * sysdeps/unix/sysv/linux/lseek.c: New file. * sysdeps/unix/sysv/linux/lseek64.c: Add default Linux implementation. * sysdeps/unix/sysv/linux/mips/mips64/syscalls.list: Remove lseek and __libc_lseek64 from auto-generation. * sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/lseek64.S: New file. [1] https://sourceware.org/ml/libc-alpha/2016-08/msg00443.html [2] https://sourceware.org/ml/libc-alpha/2016-08/msg00646.html
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ChangeLog
18
ChangeLog
@ -1,3 +1,21 @@
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2016-11-08 Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* nptl/Makefile (libpthread-routines): Remove ptw-llseek and add
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ptw-lseek64.
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* sysdeps/unix/sysv/linux/Makefile (sysdeps_routines): Remove llseek.
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* sysdeps/unix/sysv/linux/alpha/Makefile (sysdeps_routines):
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Likewise.
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* sysdeps/unix/sysv/linux/generic/wordsize-32/llseek.c: Remove file.
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* sysdeps/unix/sysv/linux/generic/wordsize-32/lseek.c: Remove file.
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* sysdeps/unix/sysv/linux/mips/mips64/llseek.c: Likewise.
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* sysdeps/unix/sysv/linux/llseek.c: Remove file.
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* sysdeps/unix/sysv/linux/lseek.c: New file.
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* sysdeps/unix/sysv/linux/lseek64.c: Add default Linux implementation.
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* sysdeps/unix/sysv/linux/mips/mips64/syscalls.list: Remove lseek and
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__libc_lseek64 from auto-generation.
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* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Likewise.
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* sysdeps/unix/sysv/linux/x86_64/x32/lseek64.S: New file.
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2016-11-07 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
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* nptl/tst-basic1.c (tf, do_test): Use write_message.
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@ -38,7 +38,7 @@ shared-only-routines = forward
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pthread-compat-wrappers = \
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write read close fcntl accept \
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connect recv recvfrom send \
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sendto fsync lseek llseek \
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sendto fsync lseek lseek64 \
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msync nanosleep open open64 pause \
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pread pread64 pwrite pwrite64 \
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tcdrain wait waitpid msgrcv msgsnd \
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@ -14,7 +14,7 @@ endif
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ifeq ($(subdir),misc)
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include $(firstword $(wildcard $(sysdirs:=/sysctl.mk)))
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sysdep_routines += clone llseek umount umount2 readahead \
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sysdep_routines += clone umount umount2 readahead \
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setfsuid setfsgid epoll_pwait signalfd \
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eventfd eventfd_read eventfd_write prlimit \
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personality
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@ -10,7 +10,7 @@ ifeq ($(subdir),misc)
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sysdep_headers += alpha/ptrace.h alpha/regdef.h sys/io.h
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sysdep_routines += ieee_get_fp_control ieee_set_fp_control \
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ioperm llseek
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ioperm
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# Support old timeval32 entry points
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sysdep_routines += osf_select osf_gettimeofday osf_settimeofday \
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@ -22,7 +22,9 @@
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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/* Provide the common name to allow more code reuse. */
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#define __NR__llseek __NR_llseek
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#ifdef __NR_llseek
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# define __NR__llseek __NR_llseek
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#endif
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#if __WORDSIZE == 64
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/* By defining the older names, glibc will build syscall wrappers for
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@ -1,46 +0,0 @@
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/* Copyright (C) 2011-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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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 <errno.h>
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#include <sys/types.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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/* Seek to OFFSET on FD, starting from WHENCE. */
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extern loff_t __llseek (int fd, loff_t offset, int whence);
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loff_t
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__llseek (int fd, loff_t offset, int whence)
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{
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loff_t retval;
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return (loff_t) (INLINE_SYSCALL (_llseek, 5, fd, (off_t) (offset >> 32),
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(off_t) (offset & 0xffffffff),
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&retval, whence) ?: retval);
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}
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weak_alias (__llseek, llseek)
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strong_alias (__llseek, __libc_lseek64)
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strong_alias (__llseek, __lseek64)
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weak_alias (__llseek, lseek64)
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/* llseek doesn't have a prototype. Since the second parameter is a
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64bit type, this results in wrong behaviour if no prototype is
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provided. */
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link_warning (llseek, "\
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the `llseek' function may be dangerous; use `lseek64' instead.")
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@ -1,46 +0,0 @@
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/* Long-long seek operation.
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Copyright (C) 1996-2016 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 <errno.h>
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#include <sys/types.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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/* Seek to OFFSET on FD, starting from WHENCE. */
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extern loff_t __llseek (int fd, loff_t offset, int whence);
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loff_t
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__llseek (int fd, loff_t offset, int whence)
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{
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loff_t retval;
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return (loff_t) (INLINE_SYSCALL (_llseek, 5, fd, (off_t) (offset >> 32),
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(off_t) (offset & 0xffffffff),
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&retval, whence) ?: retval);
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}
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weak_alias (__llseek, llseek)
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strong_alias (__llseek, __libc_lseek64)
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strong_alias (__llseek, __lseek64)
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weak_alias (__llseek, lseek64)
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/* llseek doesn't have a prototype. Since the second parameter is a
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64bit type, this results in wrong behaviour if no prototype is
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provided. */
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link_warning (llseek, "\
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the `llseek' function may be dangerous; use `lseek64' instead.")
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@ -1,6 +1,6 @@
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/* Copyright (C) 2011-2016 Free Software Foundation, Inc.
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/* Linux lseek implementation, 32 bits off_t.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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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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@ -16,23 +16,42 @@
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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 <errno.h>
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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 <sys/syscall.h>
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#include <errno.h>
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#include "overflow.h"
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#ifndef __OFF_T_MATCHES_OFF64_T
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/* Test for overflows of structures where we ask the kernel to fill them
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in with standard 64-bit syscalls but return them through APIs that
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only expose the low 32 bits of some fields. */
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static inline off_t lseek_overflow (loff_t res)
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{
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off_t retval = (off_t) res;
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if (retval == res)
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return retval;
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__set_errno (EOVERFLOW);
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return (off_t) -1;
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}
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off_t
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__lseek (int fd, off_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 (_llseek, 5, fd, (off_t) (offset >> 31),
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(off_t) offset, &res, whence);
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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 ?: lseek_overflow (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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libc_hidden_def (__lseek)
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weak_alias (__lseek, lseek)
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strong_alias (__lseek, __libc_lseek)
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#endif /* __OFF_T_MATCHES_OFF64_T */
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@ -1 +1,54 @@
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/* We don't need a definition since the llseek function is what we need. */
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/* Linux lseek implementation, 64 bits off_t.
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Copyright (C) 2016 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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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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/* llseek doesn't have a prototype. Since the second parameter is a
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64bit type, this results in wrong behaviour if no prototype is
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provided. */
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weak_alias (__lseek64, llseek)
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link_warning (llseek, "\
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the `llseek' function may be dangerous; use `lseek64' instead.")
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@ -1 +0,0 @@
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/* lseek() is 64-bit capable already. */
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# File name Caller Syscall name Args Strong name Weak names
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lseek - lseek i:iii __libc_lseek __lseek lseek __llseek llseek __libc_lseek64 __lseek64 lseek64
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ftruncate - ftruncate i:ii __ftruncate ftruncate ftruncate64 __ftruncate64
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truncate - truncate i:si truncate truncate64
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# File name Caller Syscall name # args Strong name Weak names
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# Whee! 64-bit systems naturally implement llseek.
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llseek EXTRA lseek i:iii __libc_lseek __lseek lseek __libc_lseek64 __llseek llseek __lseek64 lseek64
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lseek llseek -
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fstatfs - fstatfs i:ip __fstatfs fstatfs fstatfs64 __fstatfs64
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statfs - statfs i:sp __statfs statfs statfs64
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mmap - mmap b:aniiii __mmap mmap __mmap64 mmap64
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1
sysdeps/unix/sysv/linux/x86_64/x32/lseek64.S
Normal file
1
sysdeps/unix/sysv/linux/x86_64/x32/lseek64.S
Normal file
@ -0,0 +1 @@
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/* We don't need a definition since the llseek function is what we need. */
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