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 <sys/types.h>
  20 #include <unistd.h>
  21 #include <misc.h>
  22 #include <errno.h>
  23 #include <string.h>
  24
  25 int main() {
  26   pid_t child;
  27 dbgmsg("test: Hello World\n");
  28 while (1);
  29   int p[2];
  30   if (pipe(p)==0) {
  31     dbgmsg("p[0] = %d\n",p[0]);
  32     dbgmsg("p[1] = %d\n",p[1]);
  33
  34     if ((child = fork())==0) {
  35       dbgmsg("writing to pipe\n");
  36       //write(p[1],"Hello World\n",16);
  37       dbgmsg("write\n");
  38     }
  39     else {
  40       char buf[16];
  41
  42       dbgmsg("reading from pipe\n");
  43       read(p[0],buf,16);
  44       buf[15] = 0;
  45       dbgmsg("read: %s\n",buf);
  46     }
  47
  48     dbgmsg("reached end\n");
  49   }
  50   else dbgmsg("pipe() failed: (#%d) %s\n",errno,strerror(errno));
  51
  52   while (1);
  53
  54 }