mirror of
https://github.com/Fennix-Project/Kernel.git
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82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <syscalls.hpp>
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#include <memory.hpp>
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#include <utsname.h>
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#include <lock.hpp>
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#include <exec.hpp>
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#include <errno.h>
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#include <debug.h>
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#include "../../syscalls.h"
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#include "../../kernel.h"
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using Tasking::PCB;
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using namespace Memory;
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/* https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html */
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ssize_t sys_readlink(SysFrm *, const char *path, char *buf,
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size_t bufsize)
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{
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if (!path || !buf)
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return -EINVAL;
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if (bufsize > PAGE_SIZE)
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{
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warn("bufsize is too large: %ld", bufsize);
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return -EINVAL;
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}
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PCB *pcb = thisProcess;
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Memory::Virtual vmm(pcb->PageTable);
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if (!vmm.Check((void *)buf, Memory::US))
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{
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warn("Invalid address %#lx", buf);
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return -EFAULT;
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}
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const char *pPath = pcb->PageTable->Get(path);
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char *pBuf = pcb->PageTable->Get(buf);
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function("%s %#lx %ld", pPath, buf, bufsize);
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vfs::FileDescriptorTable *fdt = pcb->FileDescriptors;
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int fd = fdt->_open(pPath, O_RDONLY, 0);
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if (fd < 0)
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return -ENOENT;
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vfs::FileDescriptorTable::Fildes fildes = fdt->GetDescriptor(fd);
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vfs::Node *node = fildes.Handle->node;
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fdt->_close(fd);
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if (node->Type != vfs::NodeType::SYMLINK)
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return -EINVAL;
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if (!node->Symlink)
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{
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warn("Symlink null for \"%s\"?", pPath);
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return -EINVAL;
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}
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size_t len = strlen(node->Symlink);
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if (len > bufsize)
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len = bufsize;
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strncpy(pBuf, node->Symlink, len);
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return len;
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}
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