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115 lines
4.2 KiB
115 lines
4.2 KiB
2 years ago
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commit fed33b0fb03d1942a6713286176d42869c0f1580
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Author: Leandro Pereira <leandro.pereira@microsoft.com>
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Date: Wed Oct 2 12:42:28 2019 -0400
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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
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pread() is used instead of lseek()+read().
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Conflicts:
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sysdeps/unix/sysv/linux/Makefile
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(Textual conflict in routines list.)
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diff --git a/sysdeps/generic/not-cancel.h b/sysdeps/generic/not-cancel.h
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index d9f8a75dbda85ed5..260e6e4081f5fe16 100644
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--- a/sysdeps/generic/not-cancel.h
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+++ b/sysdeps/generic/not-cancel.h
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@@ -41,6 +41,8 @@
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(void) __close (fd)
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#define __read_nocancel(fd, buf, n) \
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__read (fd, buf, n)
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+#define __pread64_nocancel(fd, buf, count, offset) \
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+ __pread64 (fd, buf, count, offset)
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#define __write_nocancel(fd, buf, n) \
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__write (fd, buf, n)
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#define __writev_nocancel_nostatus(fd, iov, n) \
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diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
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index 773aaea0e980bdd6..fb4ccd63ddec7eca 100644
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--- a/sysdeps/unix/sysv/linux/Makefile
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+++ b/sysdeps/unix/sysv/linux/Makefile
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@@ -174,7 +174,8 @@ sysdep_routines += xstatconv internal_statvfs internal_statvfs64 \
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close_nocancel fcntl_nocancel nanosleep_nocancel \
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open_nocancel open64_nocancel \
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openat_nocancel openat64_nocancel \
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- pause_nocancel read_nocancel waitpid_nocancel write_nocancel
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+ pause_nocancel read_nocancel pread64_nocancel \
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+ waitpid_nocancel write_nocancel
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sysdep_headers += bits/fcntl-linux.h
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diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions
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index 336c13b57dba727a..95759bead1b0b3ca 100644
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--- a/sysdeps/unix/sysv/linux/Versions
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+++ b/sysdeps/unix/sysv/linux/Versions
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@@ -176,6 +176,7 @@ libc {
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__syscall_rt_sigqueueinfo;
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__open_nocancel;
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__read_nocancel;
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+ __pread64_nocancel;
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__close_nocancel;
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__sigtimedwait;
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# functions used by nscd
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diff --git a/sysdeps/unix/sysv/linux/not-cancel.h b/sysdeps/unix/sysv/linux/not-cancel.h
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index 09de92dee9437d98..e58db475682a8c6a 100644
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--- a/sysdeps/unix/sysv/linux/not-cancel.h
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+++ b/sysdeps/unix/sysv/linux/not-cancel.h
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@@ -43,6 +43,9 @@ __typeof (openat64) __openat64_nocancel;
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/* Non cancellable read syscall. */
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__typeof (__read) __read_nocancel;
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+/* Non cancellable pread syscall (LFS version). */
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+__typeof (__pread64) __pread64_nocancel;
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+
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/* Uncancelable write. */
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__typeof (__write) __write_nocancel;
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@@ -84,6 +87,7 @@ hidden_proto (__open64_nocancel)
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hidden_proto (__openat_nocancel)
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hidden_proto (__openat64_nocancel)
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hidden_proto (__read_nocancel)
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+hidden_proto (__pread64_nocancel)
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hidden_proto (__write_nocancel)
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hidden_proto (__close_nocancel)
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hidden_proto (__waitpid_nocancel)
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diff --git a/sysdeps/unix/sysv/linux/pread64_nocancel.c b/sysdeps/unix/sysv/linux/pread64_nocancel.c
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new file mode 100644
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index 0000000000000000..dab61260e5db43b5
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--- /dev/null
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+++ b/sysdeps/unix/sysv/linux/pread64_nocancel.c
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@@ -0,0 +1,32 @@
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+/* Linux pread64() syscall implementation -- non-cancellable.
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+
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+#include <unistd.h>
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+#include <sysdep-cancel.h>
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+#include <not-cancel.h>
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+
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+#ifndef __NR_pread64
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+# define __NR_pread64 __NR_pread
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+#endif
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+
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+ssize_t
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+__pread64_nocancel (int fd, void *buf, size_t count, off64_t offset)
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+{
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+ return INLINE_SYSCALL_CALL (pread64, fd, buf, count, SYSCALL_LL64_PRW (offset));
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+}
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+hidden_def (__pread64_nocancel)
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