arch/um/kernel/tt/ptproxy/wait.c

   1 /**********************************************************************
   2 wait.c
   3
   4 Copyright (C) 1999 Lars Brinkhoff.  See the file COPYING for licensing
   5 terms and conditions.
   6
   7 **********************************************************************/
   8
   9 #include <errno.h>
  10 #include <signal.h>
  11 #include <sys/wait.h>
  12 #include <sys/ptrace.h>
  13 #include <asm/ptrace.h>
  14
  15 #include "ptproxy.h"
  16 #include "sysdep.h"
  17 #include "wait.h"
  18 #include "user_util.h"
  19 #include "sysdep/ptrace.h"
  20 #include "sysdep/ptrace_user.h"
  21 #include "sysdep/sigcontext.h"
  22
  23 int proxy_wait_return(struct debugger *debugger, pid_t unused)
  24 {
  25         debugger->waiting = 0;
  26
  27         if(debugger->debugee->died || (debugger->wait_options & __WCLONE)){
  28                 debugger_cancelled_return(debugger, -ECHILD);
  29                 return(0);
  30         }
  31
  32         if(debugger->debugee->zombie && debugger->debugee->event)
  33                 debugger->debugee->died = 1;
  34
  35         if(debugger->debugee->event){
  36                 debugger->debugee->event = 0;
  37                 ptrace(PTRACE_POKEDATA, debugger->pid,
  38                        debugger->wait_status_ptr,
  39                        debugger->debugee->wait_status);
  40                 /* if (wait4)
  41                    ptrace (PTRACE_POKEDATA, pid, rusage_ptr, ...); */
  42                 debugger_cancelled_return(debugger, debugger->debugee->pid);
  43                 return(0);
  44         }
  45
  46         /* pause will return -EINTR, which happens to be right for wait */
  47         debugger_normal_return(debugger, -1);
  48         return(0);
  49 }
  50
  51 int parent_wait_return(struct debugger *debugger, pid_t unused)
  52 {
  53         return(debugger_normal_return(debugger, -1));
  54 }
  55
  56 int real_wait_return(struct debugger *debugger)
  57 {
  58         unsigned long ip;
  59         int err, pid;
  60
  61         pid = debugger->pid;
  62         ip = ptrace(PTRACE_PEEKUSER, pid, PT_IP_OFFSET, 0);
  63         ip = IP_RESTART_SYSCALL(ip);
  64         err = ptrace(PTRACE_POKEUSER, pid, PT_IP_OFFSET, ip);
  65         if(ptrace(PTRACE_POKEUSER, pid, PT_IP_OFFSET, ip) < 0)
  66                 tracer_panic("real_wait_return : Failed to restart system "
  67                              "call, errno = %d\n");
  68         if((ptrace(PTRACE_SYSCALL, debugger->pid, 0, SIGCHLD) < 0) ||
  69            (ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
  70            (ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
  71            debugger_normal_return(debugger, -1))
  72                 tracer_panic("real_wait_return : gdb failed to wait, "
  73                              "errno = %d\n");
  74         return(0);
  75 }
  76
  77 /*
  78  * Overrides for Emacs so that we follow Linus's tabbing style.
  79  * Emacs will notice this stuff at the end of the file and automatically
  80  * adjust the settings for this buffer only.  This must remain at the end
  81  * of the file.
  82  * ---------------------------------------------------------------------------
  83  * Local variables:
  84  * c-file-style: "linux"
  85  * End:
  86  */