From f6a191a6ee0313d61dffa70d86b033c5a598f907 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Tue, 3 Nov 2015 10:13:18 -0200 Subject: Consolidate Linux read syscall This patch consolidates the read Linux syscall implementation on sysdeps/unix/sysv/linux/read.c. This leads to a different frame pointer creation on some architectures: * It fixes BZ#21428 on aarch64, since now the returned address for the read syscall can be correctly found out by backtrace_symbols. * It makes tst-backtrace{5,6} fails on powerpc due an issue on its custom backtrace implementation. It is fixed on subsequent patch from this set. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. [BZ #21428] * include/unistd.h (read): Add hidden proto. * io/Makefile (CFLAGS-read.c): New rule. * nptl/Makefile (CFLAGS-read.c): New rule. * sysdeps/unix/sysv/linux/read.c: New file. --- sysdeps/unix/sysv/linux/read.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/read.c (limited to 'sysdeps/unix') diff --git a/sysdeps/unix/sysv/linux/read.c b/sysdeps/unix/sysv/linux/read.c new file mode 100644 index 0000000..2a02c1b --- /dev/null +++ b/sysdeps/unix/sysv/linux/read.c @@ -0,0 +1,33 @@ +/* Linux read syscall implementation. + Copyright (C) 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 + . */ + +#include +#include + +/* Read NBYTES into BUF from FD. Return the number read or -1. */ +ssize_t +__libc_read (int fd, void *buf, size_t nbytes) +{ + return SYSCALL_CANCEL (read, fd, buf, nbytes); +} +libc_hidden_def (__libc_read) + +libc_hidden_def (__read) +weak_alias (__libc_read, __read) +libc_hidden_def (read) +weak_alias (__libc_read, read) -- cgit v1.1