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sortix--sortix/libc/sys/mman/mmap.cpp
2014-03-01 14:37:39 +01:00

56 lines
1.9 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix 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 3 of the License, or (at your
option) any later version.
The Sortix 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 Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
sys/mman/mmap.cpp
Maps a window of a file into memory.
*******************************************************************************/
#include <sys/mman.h>
#include <sys/syscall.h>
// TODO: We use a wrapper system call here because there are too many parameters
// to the system call for some platforms. We should extend the system call
// ABI so we can do system calls with huge parameter lists and huge return
// values portably - then we'll make a new mmap system call that uses this
// mechanism if needed.
struct mmap_request /* duplicated in kernel/mmap.cpp */
{
void* addr;
size_t size;
int prot;
int flags;
int fd;
off_t offset;
};
DEFN_SYSCALL1(void*, sys_mmap_wrapper, SYSCALL_MMAP_WRAPPER, struct mmap_request*);
static void* mmap_wrapper(struct mmap_request* request)
{
return sys_mmap_wrapper(request);
}
extern "C"
void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset)
{
struct mmap_request request = { addr, size, prot, flags, fd, offset };
return mmap_wrapper(&request);
}