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