source/externalaction.cpp

   1 #include <sys/wait.h>
   2 #include <iostream>
   3 #include <msp/iter.h>
   4 #include "builder.h"
   5 #include "externalaction.h"
   6
   7 using namespace std;
   8 using namespace Msp;
   9
  10 int ExternalAction::check()
  11 {
  12         if(builder.get_dry_run())
  13         {
  14                 signal_done.emit();
  15                 return 0;
  16         }
  17
  18         if(!pid)
  19                 return exit_code;
  20
  21         int status;
  22         if(waitpid(pid, &status, WNOHANG)==pid)
  23         {
  24                 signal_done.emit();
  25                 if(WIFEXITED(status))
  26                         exit_code=WEXITSTATUS(status);
  27                 else
  28                         exit_code=254;
  29                 pid=0;
  30                 return exit_code;
  31         }
  32         else
  33                 return -1;
  34 }
  35
  36 /**
  37 Starts the external program.  Fill in argv before calling this.
  38 */
  39 void ExternalAction::launch()
  40 {
  41         if(builder.get_verbose()>=2)
  42         {
  43                 for(StringList::const_iterator i=argv.begin(); i!=argv.end(); ++i)
  44                 {
  45                         if(i!=argv.begin())
  46                                 cout<<' ';
  47                         cout<<*i;
  48                 }
  49                 cout<<'\n';
  50         }
  51
  52         if(builder.get_dry_run())
  53                 pid=-1;
  54         else
  55         {
  56                 pid=fork();
  57                 if(pid==0)
  58                 {
  59                         char *argv_[argv.size()+1];
  60                         for(CountingIterator<string, StringList::iterator> i=argv.begin(); i!=argv.end(); ++i)
  61                                 argv_[i.count()]=strdup(i->c_str());
  62                         argv_[argv.size()]=0;
  63                         execvp(argv_[0], argv_);
  64                         exit(1);
  65                 }
  66                 else if(pid<0)
  67                         pid=0;
  68         }
  69 }