source/misc.cpp

   1 /* $Id$
   2
   3 This file is part of builder
   4 Copyright © 2006-2009  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <sys/wait.h>
   9 #include <fcntl.h>
  10 #include <cstdlib>
  11 #include <cstring>
  12 #include <msp/io/print.h>
  13 #include "misc.h"
  14
  15 using namespace std;
  16 using namespace Msp;
  17
  18 string run_command(const StringList &argv)
  19 {
  20         int pfd[2];
  21         pipe(pfd);
  22
  23         string result;
  24
  25         pid_t pid=fork();
  26         if(pid==0)
  27         {
  28                 char *argv_[argv.size()+1];
  29
  30                 unsigned j=0;
  31                 for(StringList::const_iterator i=argv.begin(); i!=argv.end(); ++i)
  32                         argv_[j++]=strdup(i->c_str());
  33                 argv_[j]=0;
  34
  35                 close(pfd[0]);
  36                 dup2(pfd[1], 1);
  37                 close(pfd[1]);
  38                 int devnull=open("/dev/null", O_WRONLY);
  39                 dup2(devnull, 2);
  40                 close(devnull);
  41
  42                 execvp(argv_[0], argv_);
  43                 ::exit(1);
  44         }
  45         else if(pid==-1)
  46                 IO::print(IO::cerr, "Failed to execute %s\n", argv.front());
  47         else
  48         {
  49                 close(pfd[1]);
  50                 while(1)
  51                 {
  52                         char buf[1024];
  53                         int len=read(pfd[0], buf, sizeof(buf));
  54                         if(len<=0)
  55                         {
  56                                 if(waitpid(pid, 0, WNOHANG))
  57                                         break;
  58                         }
  59                         else
  60                                 result.append(buf, len);
  61                 }
  62                 close(pfd[0]);
  63         }
  64
  65         return result;
  66 }
  67
  68