From 3d975fa52b82e390ecbb0252739ee3fae64266c2 Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb 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 --- 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 + . */ + +#include +#include +#include + +#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 + . */ + +#include +#include +#include + +#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