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 "user_util.h"
  17 #include "ptrace_user.h"
  18 #include "sysdep/ptrace.h"
  19 #include "sysdep/sigcontext.h"
  20
  21 int proxy_wait_return(struct debugger *debugger, pid_t unused)
  22 {
  23         debugger->waiting = 0;
  24
  25         if(debugger->debugee->died || (debugger->wait_options & __WCLONE)){
  26                 debugger_cancelled_return(debugger, -ECHILD);
  27                 return(0);
  28         }
  29
  30         if(debugger->debugee->zombie && debugger->debugee->event)
  31                 debugger->debugee->died = 1;
  32
  33         if(debugger->debugee->event){
  34                 debugger->debugee->event = 0;
  35                 ptrace(PTRACE_POKEDATA, debugger->pid,
  36                        debugger->wait_status_ptr,
  37                        debugger->debugee->wait_status);
  38                 /* if (wait4)
  39                    ptrace (PTRACE_POKEDATA, pid, rusage_ptr, ...); */
  40                 debugger_cancelled_return(debugger, debugger->debugee->pid);
  41                 return(0);
  42         }
  43
  44         /* pause will return -EINTR, which happens to be right for wait */
  45         debugger_normal_return(debugger, -1);
  46         return(0);
  47 }
  48
  49 int parent_wait_return(struct debugger *debugger, pid_t unused)
  50 {
  51         return(debugger_normal_return(debugger, -1));
  52 }
  53
  54 int real_wait_return(struct debugger *debugger)
  55 {
  56         unsigned long ip;
  57         int pid;
  58
  59         pid = debugger->pid;
  60
  61         ip = ptrace(PTRACE_PEEKUSR, pid, PT_IP_OFFSET, 0);
  62         IP_RESTART_SYSCALL(ip);
  63
  64         if(ptrace(PTRACE_POKEUSR, pid, PT_IP_OFFSET, ip) < 0)
  65                 tracer_panic("real_wait_return : Failed to restart system "
  66                              "call, errno = %d\n", errno);
  67
  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", errno);
  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  */