source/externalaction.cpp

   1 /* $Id$
   2
   3 This file is part of builder
   4 Copyright © 2006-2007 Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <sys/wait.h>
   9 #include <iostream>
  10 #include <cstring>
  11 #include <cstdlib>
  12 #include <msp/path/utils.h>
  13 #include "builder.h"
  14 #include "externalaction.h"
  15
  16 using namespace std;
  17 using namespace Msp;
  18
  19 int ExternalAction::check()
  20 {
  21         if(builder.get_dry_run())
  22         {
  23                 signal_done.emit();
  24                 return 0;
  25         }
  26
  27         if(!pid)
  28                 return exit_code;
  29
  30         int status;
  31         if(waitpid(pid, &status, WNOHANG)==pid)
  32         {
  33                 signal_done.emit();
  34                 if(WIFEXITED(status))
  35                         exit_code=WEXITSTATUS(status);
  36                 else
  37                         exit_code=254;
  38                 pid=0;
  39                 return exit_code;
  40         }
  41         else
  42                 return -1;
  43 }
  44
  45 /**
  46 Starts the external program.  Fill in argv before calling this.
  47 */
  48 void ExternalAction::launch()
  49 {
  50         if(builder.get_verbose()>=2)
  51         {
  52                 for(StringList::const_iterator i=argv.begin(); i!=argv.end(); ++i)
  53                 {
  54                         if(i!=argv.begin())
  55                                 cout<<' ';
  56                         cout<<*i;
  57                 }
  58                 cout<<'\n';
  59         }
  60
  61         if(builder.get_dry_run())
  62                 pid=-1;
  63         else
  64         {
  65                 pid=fork();
  66                 if(pid==0)
  67                 {
  68                         char *argv_[argv.size()+1];
  69
  70                         unsigned j=0;
  71                         for(StringList::iterator i=argv.begin(); i!=argv.end(); ++i)
  72                                 argv_[j++]=strdup(i->c_str());
  73                         argv_[j]=0;
  74
  75                         if(!work_dir.empty())
  76                                 chdir(work_dir);
  77                         execvp(argv_[0], argv_);
  78                         cout<<"Couldn't execute "<<argv.front()<<'\n';
  79                         exit(1);
  80                 }
  81                 else if(pid<0)
  82                         pid=0;
  83         }
  84 }