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
  14 #include "ptproxy.h"
  15 #include "sysdep.h"
  16 #include "wait.h"
  17 #include "user_util.h"
  18 #include "sysdep/ptrace.h"
  19 #include "sysdep/ptrace_user.h"
  20 #include "sysdep/sigcontext.h"
  21
  22 int proxy_wait_return(struct debugger *debugger, pid_t unused)
  23 {
  24         debugger->waiting = 0;
  25
  26         if(debugger->debugee->died || (debugger->wait_options & __WCLONE)){
  27                 debugger_cancelled_return(debugger, -ECHILD);
  28                 return(0);
  29         }
  30
  31         if(debugger->debugee->zombie && debugger->debugee->event)
  32                 debugger->debugee->died = 1;
  33
  34         if(debugger->debugee->event){
  35                 debugger->debugee->event = 0;
  36                 ptrace(PTRACE_POKEDATA, debugger->pid,
  37                        debugger->wait_status_ptr,
  38                        debugger->debugee->wait_status);
  39                 /* if (wait4)
  40                    ptrace (PTRACE_POKEDATA, pid, rusage_ptr, ...); */
  41                 debugger_cancelled_return(debugger, debugger->debugee->pid);
  42                 return(0);
  43         }
  44
  45         /* pause will return -EINTR, which happens to be right for wait */
  46         debugger_normal_return(debugger, -1);
  47         return(0);
  48 }
  49
  50 int parent_wait_return(struct debugger *debugger, pid_t unused)
  51 {
  52         return(debugger_normal_return(debugger, -1));
  53 }
  54
  55 int real_wait_return(struct debugger *debugger)
  56 {
  57         unsigned long ip;
  58         int pid;
  59
  60         pid = debugger->pid;
  61
  62         ip = ptrace(PTRACE_PEEKUSER, pid, PT_IP_OFFSET, 0);
  63         IP_RESTART_SYSCALL(ip);
  64
  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", errno);
  68
  69         if((ptrace(PTRACE_SYSCALL, debugger->pid, 0, SIGCHLD) < 0) ||
  70            (ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
  71            (ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
  72            debugger_normal_return(debugger, -1))
  73                 tracer_panic("real_wait_return : gdb failed to wait, "
  74                              "errno = %d\n", errno);
  75         return(0);
  76 }
  77
  78 /*
  79  * Overrides for Emacs so that we follow Linus's tabbing style.
  80  * Emacs will notice this stuff at the end of the file and automatically
  81  * adjust the settings for this buffer only.  This must remain at the end
  82  * of the file.
  83  * ---------------------------------------------------------------------------
  84  * Local variables:
  85  * c-file-style: "linux"
  86  * End:
  87  */