vde/dpipe.c

   1 /* Copyright 2003 Renzo Davoli
   2  * Licensed under the GPL
   3  */
   4
   5 #include <config.h>
   6 #include<stdio.h>
   7 #include<unistd.h>
   8 #include<stdlib.h>
   9 #include<string.h>
  10
  11 int p1[2],p2[2];
  12
  13 int splitindex(int argc, char *argv[]) {
  14         register int i;
  15
  16         for (i=1; i<argc && strcmp(argv[i],"=") != 0; i++)
  17                 ;
  18         if (i>=argc)
  19                 return (-1);
  20         else
  21                 return i;
  22 }
  23
  24
  25 int main(int argc, char *argv[]) {
  26
  27         int split;
  28         char **argv1,**argv2;
  29
  30         split=splitindex(argc,argv);
  31
  32         if (argc < 4 || split < 0 || split == argc-1) {
  33                 fprintf(stderr,"Usage: %s cmd1 [arg1...] = cmd2 [arg2...]\n",argv[0]);
  34                 exit (-1);
  35         }
  36
  37         pipe(p1);
  38         pipe(p2);
  39         argv[split]=NULL;
  40         argv1=argv+1;
  41         argv2=argv+(split+1);
  42
  43         if (fork()) {
  44                 close(p1[1]); close(p2[0]);
  45                 dup2(p1[0],STDIN_FILENO);
  46                 dup2(p2[1],STDOUT_FILENO);
  47                 execvp(argv1[0],argv1);
  48         } else {
  49                 close(p2[1]); close(p1[0]);
  50                 dup2(p2[0],STDIN_FILENO);
  51                 dup2(p1[1],STDOUT_FILENO);
  52                 execvp(argv2[0],argv2);
  53         }
  54         return (0);
  55 }