int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QFile cmdlineFile("/home/pwp/dt8_cmdline");
cmdlineFile.open( QIODevice::ReadOnly | QIODevice::Text );
QTextStream cmdlineStream( &cmdlineFile );
QString line = cmdlineStream.readLine();
cmdlineFile.close();
//ro root=livedisk:/dev/sda3 livedisk_iso=/dt8.iso liveimg
if ( line.contains("livedisk") ) {
int start = line.indexOf(QString("/dev/"), 0);
if (start == -1) {
return 3;
}
int end = line.indexOf(QString(" "), start);
if (end == -1) {
return 5;
}
QString devpath;
for (int i = start; i < end; ++i) {
devpath += line[i];
}
}
return 0;
}
int main()
{
for (int i = 0; i < 1000; ++ i) {
std::string path("foo bar baz");
std::ifstream cmdlineStream(path.c_str(),std::ios_base::in);
if (cmdlineStream.is_open()){
std::string name;
std::getline(cmdlineStream, name,'\0');
}
}
return 0;
}
pid_t Systemd::getPid(string processName)
{
pid_t pid = -1;
// Open the /proc directory
DIR* dir = opendir("/proc");
if (dir == NULL)
return -1;
// Enumerate all entries in directory until process found
struct dirent* entry;
while (pid < 0 && (entry = readdir(dir))) {
// Skip non-numeric entries
int id = atoi(entry->d_name);
if (id <= 0) continue;
// Read contents of virtual /proc/{pid}/cmdline file
string cmdlinePath = string("/proc/") + entry->d_name + "/cmdline";
ifstream cmdlineStream(cmdlinePath.c_str());
string cmdline;
getline(cmdlineStream, cmdline);
// /proc/{pid}/cmdline is empty
if (cmdline.empty()) continue;
// Keep first cmdline item which contains the program path
size_t pos = cmdline.find('\0');
if (pos != string::npos)
cmdline = cmdline.substr(0, pos);
// Keep program name only, removing the path
pos = cmdline.rfind('/');
if (pos != string::npos)
cmdline = cmdline.substr(pos + 1);
// Compare against requested process name
if (processName == cmdline)
pid = id;
}
closedir(dir);
return pid;
}
