[glibc/ibm/2.30/master] Add C wrappers for process_vm_readv/process_vm_writev [BZ #25810]

[Tulio Magno Quites Machado Filho <tuliom@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bc33a4d53c1ef7207e718cc1243f2b38956cfd6f

commit bc33a4d53c1ef7207e718cc1243f2b38956cfd6f
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Apr 29 13:20:27 2020 -0700

    Add C wrappers for process_vm_readv/process_vm_writev [BZ #25810]
    
    Since the the U marker can only be applied to 2 unsigned long arguments
    in syscalls.list files, add a C wrapper for process_vm_readv and
    process_vm_writev syscals which have more than 2 unsigned long arguments.
    
    (cherry picked from commit ad9fd65d716f1ccd757b6b2feeee826d0f187ed4)

Diff:
---
 sysdeps/unix/sysv/linux/Makefile            |  3 ++-
 sysdeps/unix/sysv/linux/process_vm_readv.c  | 32 +++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/process_vm_writev.c | 32 +++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/syscalls.list       |  2 --
 4 files changed, 66 insertions(+), 3 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index a7980a60f6..92e0bac384 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -18,7 +18,8 @@ sysdep_routines += clone umount umount2 readahead \
 		   setfsuid setfsgid epoll_pwait signalfd \
 		   eventfd eventfd_read eventfd_write prlimit \
 		   personality epoll_wait tee vmsplice splice \
-		   open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get
+		   open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \
+		   process_vm_readv process_vm_writev
 
 CFLAGS-gethostid.c = -fexceptions
 CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables
diff --git a/sysdeps/unix/sysv/linux/process_vm_readv.c b/sysdeps/unix/sysv/linux/process_vm_readv.c
new file mode 100644
index 0000000000..e1377f7e50
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/process_vm_readv.c
@@ -0,0 +1,32 @@
+/* process_vm_readv - Linux specific syscall.
+   Copyright (C) 2020 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <sysdep.h>
+#include <errno.h>
+#include <sys/uio.h>
+
+ssize_t
+process_vm_readv (pid_t pid, const struct iovec *local_iov,
+		  unsigned long int liovcnt,
+		  const struct iovec *remote_iov,
+		  unsigned long int riovcnt, unsigned long int flags)
+{
+  return INLINE_SYSCALL_CALL (process_vm_readv, pid, local_iov,
+			      liovcnt, remote_iov, riovcnt, flags);
+}
diff --git a/sysdeps/unix/sysv/linux/process_vm_writev.c b/sysdeps/unix/sysv/linux/process_vm_writev.c
new file mode 100644
index 0000000000..944ab9b7f1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/process_vm_writev.c
@@ -0,0 +1,32 @@
+/* process_vm_writev - Linux specific syscall.
+   Copyright (C) 2020 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <sysdep.h>
+#include <errno.h>
+#include <sys/uio.h>
+
+ssize_t
+process_vm_writev (pid_t pid, const struct iovec *local_iov,
+		   unsigned long int liovcnt,
+		   const struct iovec *remote_iov,
+		   unsigned long int riovcnt, unsigned long int flags)
+{
+  return INLINE_SYSCALL_CALL (process_vm_writev, pid, local_iov,
+			      liovcnt, remote_iov, riovcnt, flags);
+}
diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index 198d13c08f..b9067114da 100644
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -105,8 +105,6 @@ name_to_handle_at EXTRA	name_to_handle_at i:isppi name_to_handle_at
 
 setns		EXTRA	setns		i:ii	setns
 
-process_vm_readv EXTRA	process_vm_readv i:ipipii process_vm_readv
-process_vm_writev EXTRA	process_vm_writev i:ipipii process_vm_writev
 memfd_create    EXTRA	memfd_create	i:si    memfd_create
 pkey_alloc	EXTRA	pkey_alloc	i:ii	pkey_alloc
 pkey_free	EXTRA	pkey_free	i:i	pkey_free