mirror of
https://github.com/Fennix-Project/Kernel.git
synced 2025-05-28 15:34:33 +00:00
55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
/*
|
|
This file is part of Fennix Kernel.
|
|
|
|
Fennix Kernel is free software: you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License as
|
|
published by the Free Software Foundation, either version 3 of
|
|
the License, or (at your option) any later version.
|
|
|
|
Fennix Kernel 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <syscalls.hpp>
|
|
|
|
#include <memory.hpp>
|
|
#include <lock.hpp>
|
|
#include <exec.hpp>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include "../../syscalls.h"
|
|
#include "../../kernel.h"
|
|
|
|
using Tasking::PCB;
|
|
using namespace Memory;
|
|
|
|
/* https://pubs.opengroup.org/onlinepubs/009604499/functions/read.html */
|
|
ssize_t sys_read(SysFrm *, int fildes,
|
|
void *buf, size_t nbyte)
|
|
{
|
|
void *safe_buf = nullptr;
|
|
PCB *pcb = thisProcess;
|
|
SmartHeap sh(nbyte, pcb->vma);
|
|
safe_buf = sh.Get();
|
|
|
|
function("%d, %p, %d", fildes, buf, nbyte);
|
|
vfs::FileDescriptorTable *fdt = pcb->FileDescriptors;
|
|
ssize_t ret = fdt->_read(fildes, safe_buf, nbyte);
|
|
if (ret >= 0)
|
|
fdt->_lseek(fildes, ret, SEEK_CUR);
|
|
else
|
|
return ret;
|
|
|
|
{
|
|
SwapPT swap(pcb->PageTable);
|
|
memcpy(buf, safe_buf, nbyte);
|
|
}
|
|
return ret;
|
|
}
|