[PATCH 21/28] linux: Implement mremap in C
Adhemerval Zanella
adhemerval.zanella@linaro.org
Wed Nov 18 19:55:45 GMT 2020
This avoid variadic function in syscalls.list and the possible mismatch
between the asm syscall macros the required ABI to handle the variadic
argument.
Checked on x86_64-linux-gnu.
---
sysdeps/unix/sysv/linux/Makefile | 2 +-
sysdeps/unix/sysv/linux/mremap.c | 41 +++++++++++++++++++++++++++
sysdeps/unix/sysv/linux/syscalls.list | 1 -
3 files changed, 42 insertions(+), 2 deletions(-)
create mode 100644 sysdeps/unix/sysv/linux/mremap.c
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index c3b24f9332..68818862dd 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -61,7 +61,7 @@ sysdep_routines += adjtimex clone umount umount2 readahead sysctl \
open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \
timerfd_gettime timerfd_settime prctl \
process_vm_readv process_vm_writev clock_adjtime \
- time64-support pselect32 fanotify_mark
+ time64-support pselect32 fanotify_mark mremap
CFLAGS-gethostid.c = -fexceptions
CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables
diff --git a/sysdeps/unix/sysv/linux/mremap.c b/sysdeps/unix/sysv/linux/mremap.c
new file mode 100644
index 0000000000..83b4e95338
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mremap.c
@@ -0,0 +1,41 @@
+/* Remap a virtual memory address. 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 <sys/mman.h>
+#include <sysdep.h>
+#include <stdarg.h>
+#include <stddef.h>
+
+void *
+__mremap (void *addr, size_t old_len, size_t new_len, int flags, ...)
+{
+ va_list va;
+ void *new_addr = NULL;
+
+ if (flags & MREMAP_FIXED)
+ {
+ va_start (va, flags);
+ new_addr = va_arg (va, void *);
+ va_end (va);
+ }
+
+ return (void *) INLINE_SYSCALL_CALL (mremap, addr, old_len, new_len, flags,
+ new_addr);
+}
+libc_hidden_def (__mremap)
+weak_alias (__mremap, mremap)
diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index 01ec2bfa95..7a0172a422 100644
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -35,7 +35,6 @@ mincore - mincore i:aUV mincore
mlock - mlock i:bU mlock
mlockall - mlockall i:i mlockall
mount EXTRA mount i:sssUp __mount mount
-mremap EXTRA mremap b:aUUip __mremap mremap
munlock - munlock i:aU munlock
munlockall - munlockall i: munlockall
nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC_2.28
--
2.25.1
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