Sources/opsys.cpp

   1 #include "Headers/opsys.h"
   2
   3 OpSys OS;       // Global OpSys variable. Should be accessible to all modules.
   4 bool exit_program = false;
   5
   6 void signal_handler(int s)
   7 {
   8     if (s==SIGINT)
   9     {
  10         cout << "\nSIGINT (Ctrl+C) received. Code " << s << ". Exiting.\n";
  11         exit_program = true;  // We'll do this instead of an exit(0) in order to allow for cleanup.
  12     }
  13
  14     if (s==SIGHUP)
  15     {
  16         cout << "\nSIGHUP received. Code " << s << ". Exiting.\n";
  17         exit_program = true;  // We'll do this instead of an exit(0) in order to allow for cleanup.
  18     }
  19 }
  20
  21 SignalHandler::SignalHandler()
  22 {
  23     signal_action.sa_handler = signal_handler;
  24     sigemptyset(&signal_action.sa_mask);
  25     signal_action.sa_flags = 0;
  26     sigaction(SIGINT, &signal_action, NULL);
  27 }
  28
  29 string OpSys::get_cwd()
  30 {
  31     char temp[MAXPATHLEN];
  32     return getcwd(temp, sizeof(temp)) ? std::string( temp ) : std::string("");
  33 }
  34
  35 void OpSys::change_dir(vector<string> command)
  36 {
  37     string cmd = "";
  38     for(unsigned short int i = 1; i < command.size(); i++)
  39     {
  40         cmd += command[i];
  41     }
  42     if (chdir(cmd.c_str()))
  43     {
  44         cerr << "miniShell: cd: " << cmd << ": Arquivo ou diretório não encontrado\n";
  45     }
  46     else {
  47         get_cwd();
  48         cwd_changed = true;
  49     }
  50 }
  51
  52 vector<const char*> make_argv(vector<string>const& in)
  53 {
  54     vector<const char*> out;
  55     out.reserve(in.size() + 1);
  56     for (const auto& s : in)
  57         out.push_back(s.data());
  58     out.push_back(nullptr);
  59     out.shrink_to_fit();
  60     return out;
  61 }
  62
  63 short OpSys::simple_command(vector<string> tokens)
  64 {
  65     int status;
  66     if(is_verbose)
  67     {
  68         cerr << "execvp(\"" << tokens[0] << "\",\"";
  69         for(unsigned int i = 0; i < tokens.size()-1; i++)
  70             cerr << tokens[i] << ' ';
  71         cerr << tokens.back();
  72         cerr << "\");\n";
  73     }
  74
  75
  76     pid_t pid = fork();
  77     if (pid == 0)
  78     {
  79         //printf("execlp(%s, %s, NULL);", bincmd.c_str(), command.c_str());
  80         execvp(tokens[0].c_str(), const_cast<char* const *>(make_argv(tokens).data()));
  81         cerr << tokens[0] << ": command not found.\n";
  82         return 0;        // TODO: exit with cleanup
  83     }
  84     else if (pid < 0)
  85     {
  86         printf("Couldn't fork a process.");
  87         return 0;
  88     }
  89     waitpid(-1, &status, WUNTRACED);
  90     return 1;
  91 }
  92
  93 OpSys::OpSys()
  94 {
  95     cwd = get_cwd();
  96     if(cwd.empty())
  97         cerr << RED_ANSI << "Could not get the current working directory.\n" << RESET_ANSI;
  98
  99     uid_t uid = geteuid();             // Gets the effective ID of the user that started miniSHELL
 100     struct passwd pwent;
 101     struct passwd *pwent_ptr;
 102     char buffer[1024];
 103
 104         // Looks for the UDI on the password databank and saves the result on pwent
 105     getpwuid_r(uid, &pwent, buffer, sizeof buffer, &pwent_ptr);
 106     username = pwent.pw_name;   // Saves username
 107
 108     char hostname[64];
 109     gethostname(hostname, 64);
 110     this->hostname = hostname;
 111 }