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From 3d975fa52b82e390ecbb0252739ee3fae64266c2 Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbx@openadk.org>
Date: Wed, 14 Aug 2024 17:28:19 +0200
Subject: [PATCH 1/2] add process_vm_{read,write}v syscall wrapper from glibc
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
---
include/sys/uio.h | 19 +++++++++++
libc/sysdeps/linux/common/Makefile.in | 2 ++
libc/sysdeps/linux/common/process_vm_readv.c | 32 +++++++++++++++++++
libc/sysdeps/linux/common/process_vm_writev.c | 32 +++++++++++++++++++
4 files changed, 85 insertions(+)
create mode 100644 libc/sysdeps/linux/common/process_vm_readv.c
create mode 100644 libc/sysdeps/linux/common/process_vm_writev.c
diff --git a/include/sys/uio.h b/include/sys/uio.h
index 330426fec..9e9708c0c 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -74,6 +74,25 @@ extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
__off64_t __offset) __wur;
#endif /* Use misc. */
+#ifdef __USE_GNU
+/* Read from another process' address space. */
+extern ssize_t process_vm_readv (pid_t __pid, const struct iovec *__lvec,
+ unsigned long int __liovcnt,
+ const struct iovec *__rvec,
+ unsigned long int __riovcnt,
+ unsigned long int __flags)
+ __THROW;
+
+/* Write to another process' address space. */
+extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec,
+ unsigned long int __liovcnt,
+ const struct iovec *__rvec,
+ unsigned long int __riovcnt,
+ unsigned long int __flags)
+ __THROW;
+
+#endif
+
__END_DECLS
#endif /* sys/uio.h */
diff --git a/libc/sysdeps/linux/common/Makefile.in b/libc/sysdeps/linux/common/Makefile.in
index 83be2691e..e0b280c33 100644
--- a/libc/sysdeps/linux/common/Makefile.in
+++ b/libc/sysdeps/linux/common/Makefile.in
@@ -40,6 +40,8 @@ CSRC-$(UCLIBC_LINUX_SPECIFIC) += \
ppoll.c \
prctl.c \
prlimit.c \
+ process_vm_readv.c \
+ process_vm_writev.c \
readahead.c \
reboot.c \
remap_file_pages.c \
diff --git a/libc/sysdeps/linux/common/process_vm_readv.c b/libc/sysdeps/linux/common/process_vm_readv.c
new file mode 100644
index 000000000..b69c1c97a
--- /dev/null
+++ b/libc/sysdeps/linux/common/process_vm_readv.c
@@ -0,0 +1,32 @@
+/* process_vm_readv - Linux specific syscall.
+ Copyright (C) 2020-2024 Free Software Foundation, Inc.
+
+ 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 <sys/uio.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#ifdef __NR_process_vm_readv
+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 (process_vm_readv, 6, pid, local_iov,
+ liovcnt, remote_iov, riovcnt, flags);
+}
+#endif
diff --git a/libc/sysdeps/linux/common/process_vm_writev.c b/libc/sysdeps/linux/common/process_vm_writev.c
new file mode 100644
index 000000000..e22817a8d
--- /dev/null
+++ b/libc/sysdeps/linux/common/process_vm_writev.c
@@ -0,0 +1,32 @@
+/* process_vm_writev - Linux specific syscall.
+ Copyright (C) 2020-2024 Free Software Foundation, Inc.
+
+ 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 <sys/uio.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#ifdef __NR_process_vm_writev
+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 (process_vm_writev, 6, pid, local_iov,
+ liovcnt, remote_iov, riovcnt, flags);
+}
+#endif
--
2.30.2
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