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/*
This file is part of Android File Transfer For Linux.
Copyright (C) 2015-2020 Vladimir Menshakov
This 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.
This 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 this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <mtp/usb/DeviceBusyException.h>
#include <mtp/log.h>
#ifdef __linux__
# include <fcntl.h>
# include <signal.h>
# include <unistd.h>
# include <linux/limits.h>
//mtp
# include <Exception.h>
# include <mtp/backend/linux/usb/Directory.h>
#endif
namespace mtp { namespace usb
{
#ifdef __linux__
namespace
{
std::string ReadLink(const std::string &path)
{
char buf[NAME_MAX];
auto pathSize = readlink(path.c_str(), buf, sizeof(buf));
if (pathSize >= 0)
return std::string(buf, pathSize);
debug("Readlink ", path, ": ", posix::Exception::GetErrorMessage(errno));
return buf;
}
}
#endif
DeviceBusyException::DeviceBusyException(int fd, const std::string &msg):
std::runtime_error(msg)
{
try
{
//only linux for now
#ifdef __linux__
auto myPid = getpid();
do
{
if (fd < 0)
break;
debug("trying to find processes which are holding fd ", fd);
#if 0 //apple
char filePath[PATH_MAX];
if (fcntl(fd, F_GETPATH, filePath) == -1)
{
error("error getting file path for fd ", fd, ": ", Exception::GetErrorMessage(errno));
break;
}
#else
std::string filePath = ReadLink("/proc/self/fd/" + std::to_string(fd));
if (filePath.empty())
break;
#endif
debug("mapped ", fd, " to ", filePath);
Directory proc("/proc");
while(true)
{
auto pidPath = proc.Read();
if (pidPath.empty())
break;
int pid;
if (sscanf(pidPath.c_str(), "%d", &pid) != 1)
continue;
if (pid == myPid)
continue;
// debug("got process dir ", pidPath);
auto fdsRoot = "/proc/" + pidPath + "/fd";
if (access(fdsRoot.c_str(), R_OK) != 0)
{
// debug("skipping inaccessible path ", fdsRoot);
continue;
}
try
{
Directory fds(fdsRoot);
while(true)
{
auto fdPath = fds.Read();
if (fdPath.empty())
break;
if (fdPath[0] == '.')
continue;
auto fdTarget = ReadLink(fdsRoot + "/" + fdPath);
if (fdTarget.empty())
continue;
//debug("read mapping to ", fdTarget);
if (fdTarget == filePath)
{
debug("process ", pid, " is holding file descriptor to ", filePath);
auto image = ReadLink("/proc/" + pidPath + "/exe");
Processes.push_back({ pid, image });
}
}
}
catch(const std::exception & ex)
{ debug("error reading ", fdsRoot, ": ", ex.what()); }
}
}
while(false);
#endif
} catch(const std::exception &ex)
{ debug("DeviceBusyException error: ", ex.what()); }
}
void DeviceBusyException::Kill() const
{ Kill(Processes); }
void DeviceBusyException::Kill(const std::vector<ProcessDescriptor> & processes)
{
for(auto & desc : processes)
{
try
{ Kill(desc); }
catch(const std::exception & ex)
{ error("Kill: ", ex.what()); }
}
}
void DeviceBusyException::Kill(const ProcessDescriptor & desc)
{
#ifdef __linux__
if (kill(desc.Id, SIGTERM) != 0)
throw posix::Exception("kill(" + std::to_string(desc.Id) + " (" + desc.Name + "), SIGTERM)");
sleep(1);
kill(desc.Id, SIGKILL); //assuming we can do it
#else
throw std::runtime_error("not implemented");
#endif
}
}}
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