apps/test/test.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <misc.h>
  20 #include <unistd.h>
  21 #include <errno.h>
  22
  23 int main() {
  24   pid_t child;
  25
  26   int p[2];
  27   if (pipe(p)==0) {
  28     dbgmsg("p[0] = %d\n",p[0]);
  29     dbgmsg("p[1] = %d\n",p[1]);
  30
  31     if ((child = fork())==0) {
  32       dbgmsg("writing to pipe\n");
  33       //write(p[1],"Hello World\n",16);
  34       dbgmsg("write\n");
  35     }
  36     else {
  37       char buf[16];
  38
  39       dbgmsg("reading from pipe\n");
  40       read(p[0],buf,16);
  41       buf[15] = 0;
  42       dbgmsg("read: %s\n",buf);
  43     }
  44
  45     dbgmsg("reached end\n");
  46   }
  47   else dbgmsg("pipe() failed: (#%d) %s\n",errno,strerror(errno));
  48
  49   while (1);
  50   return 0;
  51 }