Logo Search packages:      
Sourcecode: linux version File versions  Download package

clone.c

#include <sched.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <asm/unistd.h>
#include "as-layout.h"
#include "ptrace_user.h"
#include "skas.h"
#include "stub-data.h"
#include "uml-config.h"
#include "sysdep/stub.h"
#include "kern_constants.h"

/* This is in a separate file because it needs to be compiled with any
 * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
 *
 * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
 * on some systems.
 */

void __attribute__ ((__section__ (".__syscall_stub")))
stub_clone_handler(void)
{
      struct stub_data *data = (struct stub_data *) STUB_DATA;
      long err;

      err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
                      STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
      if(err != 0)
            goto out;

      err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
      if(err)
            goto out;

      err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL, 
                      (long) &data->timer, 0);
      if(err)
            goto out;

      remap_stack(data->fd, data->offset);
      goto done;

 out:
      /* save current result. 
       * Parent: pid; 
       * child: retcode of mmap already saved and it jumps around this 
       * assignment
       */
      data->err = err;
 done:
      trap_myself();
}

Generated by  Doxygen 1.6.0   Back to index