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