| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | */ |