arch/um/kernel/tt/exec_user.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include <stdlib.h>
   9 #include <sched.h>
  10 #include <errno.h>
  11 #include <sys/wait.h>
  12 #include <signal.h>
  13 #include "user_util.h"
  14 #include "kern_util.h"
  15 #include "user.h"
  16 #include "ptrace_user.h"
  17 #include "os.h"
  18
  19 void do_exec(int old_pid, int new_pid)
  20 {
  21         unsigned long regs[FRAME_SIZE];
  22         int err;
  23
  24         if((ptrace(PTRACE_ATTACH, new_pid, 0, 0) < 0) ||
  25            (ptrace(PTRACE_CONT, new_pid, 0, 0) < 0))
  26                 tracer_panic("do_exec failed to attach proc - errno = %d",
  27                              errno);
  28
  29         CATCH_EINTR(err = waitpid(new_pid, 0, WUNTRACED));
  30         if (err < 0)
  31                 tracer_panic("do_exec failed to attach proc in waitpid - errno = %d",
  32                              errno);
  33
  34         if(ptrace_getregs(old_pid, regs) < 0)
  35                 tracer_panic("do_exec failed to get registers - errno = %d",
  36                              errno);
  37
  38         os_kill_ptraced_process(old_pid, 0);
  39
  40         if (ptrace(PTRACE_OLDSETOPTIONS, new_pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
  41                 tracer_panic("do_exec: PTRACE_SETOPTIONS failed, errno = %d", errno);
  42
  43         if(ptrace_setregs(new_pid, regs) < 0)
  44                 tracer_panic("do_exec failed to start new proc - errno = %d",
  45                              errno);
  46 }
  47
  48 /*
  49  * Overrides for Emacs so that we follow Linus's tabbing style.
  50  * Emacs will notice this stuff at the end of the file and automatically
  51  * adjust the settings for this buffer only.  This must remain at the end
  52  * of the file.
  53  * ---------------------------------------------------------------------------
  54  * Local variables:
  55  * c-file-style: "linux"
  56  * End:
  57  */