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#include <stdio.h>

#include <unistd.h>

FILE * popen(command, rw)

char * command;

char * rw;

{

   int pipe_fd[2];

   int pid, reading;

   if( pipe(pipe_fd) < 0 ) return NULL;

   reading = (rw[0] == 'r');

   pid = vfork();

   if( pid < 0 ) { close(pipe_fd[0]); close(pipe_fd[1]); return NULL; }

   if( pid == 0 )

   {

      close(pipe_fd[!reading]);

      close(reading);

      if( pipe_fd[reading] != reading )

      {

         dup2(pipe_fd[reading], reading);

         close(pipe_fd[reading]);

      }

      execl("/bin/sh", "sh", "-c", command, (char*)0);

      _exit(255);

   }

   close(pipe_fd[reading]);

   return fdopen(pipe_fd[!reading], rw);

}

int pclose(fd)

FILE *fd;

{

   int waitstat;

   if( fclose(fd) != 0 ) return EOF;

   wait(&waitstat);

}