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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2015-11-03 10:13:18 -0200 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-05-11 17:27:30 -0300 |
commit | f6a191a6ee0313d61dffa70d86b033c5a598f907 (patch) | |
tree | b4e748887ab6a83601122f9a9259bb34471dfc2e /sysdeps/unix | |
parent | cab6e5af9d51d4398522af782e20c743daf37461 (diff) | |
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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.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r-- | sysdeps/unix/sysv/linux/read.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/read.c b/sysdeps/unix/sysv/linux/read.c new file mode 100644 index 0000000000..2a02c1bae4 --- /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 + <http://www.gnu.org/licenses/>. */ + +#include <unistd.h> +#include <sysdep-cancel.h> + +/* 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) |