#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <syscall.h>
#include <sys/wait.h>
#include <inttypes.h>

#define SWITCHED_SYSCALL

#if defined SWITCHED_SYSCALL
static int __NR_sys_vserver= 273;
_syscall3(int, sys_vserver, uint32_t, cmd, uint32_t, id, void *, data);

#define VC_CAT_COMPAT		63
#define VC_CMD(c,i,v)		((((VC_CAT_ ## c) & 0x3F) << 24) \
				| (((i) & 0xFF) << 16) | ((v) & 0xFFF))

#define VCMD_new_s_context	VC_CMD(COMPAT, 1, 1)

struct  vcmd_new_s_context_v1 {
	uint32_t remove_cap;
	uint32_t flags;
};

#else
static int __NR_new_s_context= 227;
_syscall4(int, new_s_context, int, nbctx, int *, ctxs, int, remove_cap,
          int, flags);
#endif

//----------------------------------------------------------------------

void start_ctx (int ctx_in) {
  int pid = fork ();

  switch (pid) {
    case 0:
    case -1:
      break;

    default:
    {
      int ctx = 0;
#if defined SWITCHED_SYSCALL
      struct vcmd_new_s_context_v1 data = {0,0};
      ctx = sys_vserver (VCMD_new_s_context, -1, &data);
#else
      int ctxs[16];
      ctxs[0] = -1;
      ctx = new_s_context (1,ctxs,0,0);
#endif
      printf ("ctx: %d\n", ctx);
      exit (0);
    }
  }
}

//----------------------------------------------------------------------

void loop () {
  printf( "loop()\n");
  while (1) {
    start_ctx (0);
  }
}

//----------------------------------------------------------------------

int main (int argc, char ** argv) {
  int i = 2;


  signal (SIGCHLD, SIG_IGN);

  while (i--) {
    if (!fork()) {
      loop ();
    }
  }
  
  while (1) {
    printf ("%d\r", ++i);
    fflush (stdout);
    sleep (1);
  }
}

//----------------------------------------------------------------------