src/procmgmt/redirect_nt.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 #include <afsconfig.h>
  11 #include <afs/param.h>
  12
  13 #include <roken.h>
  14
  15 #include <windows.h>
  16
  17 #include "pmgtprivate.h"
  18
  19 /* Implements native-signal redirection.  Basically, NT generated signals
  20  * are caught and passed through to the signal functions implemented by
  21  * this process management library.
  22  *
  23  * Note that signals are passed through by name, since procmgmt.h can't
  24  * be included here (given that signal(), raise(), etc. are redefined).
  25  */
  26
  27
  28 /* Program must have FP code to trap SIGFPE; MS suggests the following def. */
  29 static volatile double dummyDouble = 0.0f;
  30
  31
  32 /*
  33  * NativeSignalHandler() -- handles (redirects) NT-generated signals.
  34  */
  35 static void __cdecl
  36 NativeSignalHandler(int signo)
  37 {
  38     const char *signame = NULL;
  39     int libSigno;
  40
  41     /* Reinstall signal handler for signo; no reliable signals on NT */
  42     (void)signal(signo, NativeSignalHandler);
  43
  44     /* NT defines few signals, and doesn't really generate all of these */
  45     switch (signo) {
  46     case SIGINT:
  47         signame = "SIGINT";
  48         break;
  49     case SIGILL:
  50         signame = "SIGILL";
  51         break;
  52     case SIGFPE:
  53         signame = "SIGFPE";
  54         break;
  55     case SIGSEGV:
  56         signame = "SIGSEGV";
  57         break;
  58     case SIGTERM:
  59         signame = "SIGTERM";
  60         break;
  61     case SIGABRT:
  62         signame = "SIGABRT";
  63         break;
  64     default:
  65         /* unexpect signo value */
  66         signame = NULL;
  67         break;
  68     }
  69
  70     if (signame != NULL) {
  71         /* Redirect NT signal into process management library */
  72         if (pmgt_SignalRaiseLocalByName(signame, &libSigno) == 0
  73             && signo == SIGABRT) {
  74             /* SIGABRT is a special case.  It is generated by NT when abort()
  75              * is called.  Upon returning from the signal handler, abort()
  76              * will terminate the process with an exit code of 3.  In order
  77              * to make an understandable termination status available to the
  78              * process management library's waitpid() function, we exit
  79              * the process here with a more appropriate exit code.
  80              */
  81             ExitProcess(PMGT_SIGSTATUS_ENCODE(libSigno));
  82         }
  83     }
  84 }
  85
  86
  87 /*
  88  * pmgt_RedirectNativeSignals() -- initialize native signal redirection.
  89  */
  90 int
  91 pmgt_RedirectNativeSignals(void)
  92 {
  93     if (signal(SIGINT, NativeSignalHandler) == SIG_ERR
  94         || signal(SIGILL, NativeSignalHandler) == SIG_ERR
  95         || signal(SIGFPE, NativeSignalHandler) == SIG_ERR
  96         || signal(SIGSEGV, NativeSignalHandler) == SIG_ERR
  97         || signal(SIGTERM, NativeSignalHandler) == SIG_ERR
  98         || signal(SIGABRT, NativeSignalHandler) == SIG_ERR) {
  99         errno = EINVAL;
 100         return -1;
 101     } else {
 102         return 0;
 103     }
 104 }
 105
 106 /*
 107  * pmgt_RedirectNativeSignals() -- initialize native signal redirection.
 108  */
 109 int
 110 pmgt_RestoreNativeSignals(void)
 111 {
 112     if (signal(SIGINT, SIG_DFL) == SIG_ERR
 113         || signal(SIGILL, SIG_DFL) == SIG_ERR
 114         || signal(SIGFPE, SIG_DFL) == SIG_ERR
 115         || signal(SIGSEGV, SIG_DFL) == SIG_ERR
 116         || signal(SIGTERM, SIG_DFL) == SIG_ERR
 117         || signal(SIGABRT, SIG_DFL) == SIG_ERR) {
 118         errno = EINVAL;
 119         return -1;
 120     } else {
 121         return 0;
 122     }
 123 }
 124