Function SysReadLink

Kernel/src/arch/x86_64/syscalls.cpp:1880–1901

//////////////////////// \brief SysReadLink(pathname, buf, bufsize) Read a symbolic link \param pathname - const char*, Path of the symbolic link \param buf - char*, Buffer to store the link data \param bufsize - size_t, Size of buf \return Amount of bytes read on success \return Negative value on failure ////////////////////////

/// \return Negative value on failure
/////////////////////////////
long SysReadLink(regs64_t* r){
	process_t* proc = Scheduler::GetCurrentProcess();

	if(!Memory::CheckUsermodePointer(SC_ARG0(r), 0, proc->addressSpace)){
		return -EFAULT; // Invalid path pointer
	}

	if(!Memory::CheckUsermodePointer(SC_ARG1(r), SC_ARG2(r), proc->addressSpace)){
		return -EFAULT; // Invalid buffer
	}

	const char* path = reinterpret_cast<const char*>(SC_ARG0(r));
	char* buffer = reinterpret_cast<char*>(SC_ARG1(r));
	size_t bufferSize = SC_ARG2(r);

	FsNode* link = fs::ResolvePath(path);
	if(!link){
		return -ENOENT; // path does not exist
	}

	return link->ReadLink(buffer, bufferSize);
}

/////////////////////////////
/// \brief SysSpawnThread(entry, stack) Spawn a new thread under current process