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Add nocancel version of pread64()

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This is in preparation for changes in the dynamic linker so that
pread() is used instead of lseek()+read().

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit fed33b0fb03d1942a6713286176d42869c0f1580)
This commit is contained in:
Leandro Pereira 2019-10-02 12:42:28 -04:00 committed by Florian Weimer
parent dfa1f9fe0d
commit 6359e79b4c
5 changed files with 41 additions and 2 deletions
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2
sysdeps/generic/not-cancel.h
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@ -41,6 +41,8 @@
(void) __close (fd)
#define __read_nocancel(fd, buf, n) \
__read (fd, buf, n)
#define __pread64_nocancel(fd, buf, count, offset) \
__pread64 (fd, buf, count, offset)
#define __write_nocancel(fd, buf, n) \
__write (fd, buf, n)
#define __writev_nocancel_nostatus(fd, iov, n) \

4
sysdeps/unix/sysv/linux/Makefile
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@ -212,8 +212,8 @@ sysdep_routines += xstatconv internal_statvfs internal_statvfs64 \
close_nocancel fcntl_nocancel nanosleep_nocancel \
open_nocancel open64_nocancel \
openat_nocancel openat64_nocancel \
pause_nocancel read_nocancel waitpid_nocancel \
write_nocancel statx_cp
pause_nocancel read_nocancel pread64_nocancel \
waitpid_nocancel write_nocancel statx_cp
sysdep_headers += bits/fcntl-linux.h

1
sysdeps/unix/sysv/linux/Versions
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@ -182,6 +182,7 @@ libc {
__syscall_rt_sigqueueinfo;
__open_nocancel;
__read_nocancel;
__pread64_nocancel;
__close_nocancel;
__sigtimedwait;
# functions used by nscd

4
sysdeps/unix/sysv/linux/not-cancel.h
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@ -43,6 +43,9 @@ __typeof (openat64) __openat64_nocancel;
/* Non cancellable read syscall. */
__typeof (__read) __read_nocancel;
/* Non cancellable pread syscall (LFS version). */
__typeof (__pread64) __pread64_nocancel;
/* Uncancelable write. */
__typeof (__write) __write_nocancel;
@ -84,6 +87,7 @@ hidden_proto (__open64_nocancel)
hidden_proto (__openat_nocancel)
hidden_proto (__openat64_nocancel)
hidden_proto (__read_nocancel)
hidden_proto (__pread64_nocancel)
hidden_proto (__write_nocancel)
hidden_proto (__close_nocancel)
hidden_proto (__waitpid_nocancel)

32
sysdeps/unix/sysv/linux/pread64_nocancel.c Normal file
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@ -0,0 +1,32 @@
/* Linux pread64() syscall implementation -- non-cancellable.
Copyright (C) 2019 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>
#include <not-cancel.h>
#ifndef __NR_pread64
# define __NR_pread64 __NR_pread
#endif
ssize_t
__pread64_nocancel (int fd, void *buf, size_t count, off64_t offset)
{
return INLINE_SYSCALL_CALL (pread64, fd, buf, count, SYSCALL_LL64_PRW (offset));
}
hidden_def (__pread64_nocancel)