source/externalaction.cpp

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