npapi_plugin/srpc/utility.h

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32
  33 #ifndef NATIVE_CLIENT_NPAPI_PLUGIN_SRPC_UTILITY_H_
  34 #define NATIVE_CLIENT_NPAPI_PLUGIN_SRPC_UTILITY_H_
  35
  36 #include <setjmp.h>
  37 #include <signal.h>
  38 #include "native_client/include/portability.h"
  39
  40 namespace nacl_srpc {
  41
  42 // CatchSignals encapsulates the setup and removal of application-defined
  43 // signal handlers.
  44 // TODO: need to revisit thread-specific, etc., signal handling
  45
  46 class ScopedCatchSignals {
  47  public:
  48   typedef void (*SigHandlerType)(int signal_number);
  49   // Installs handler as the signal handler for SIGSEGV and SIGILL.
  50   explicit ScopedCatchSignals(SigHandlerType handler) {
  51     prev_segv_handler_ = signal(SIGSEGV, handler);
  52     prev_ill_handler_ = signal(SIGILL, handler);
  53 #ifndef _MSC_VER
  54     prev_pipe_handler_ = signal(SIGPIPE, handler);
  55 #endif
  56   }
  57   // Restores the previous signal handler
  58   ~ScopedCatchSignals() {
  59     signal(SIGSEGV, prev_segv_handler_);
  60     signal(SIGILL, prev_ill_handler_);
  61 #ifndef _MSC_VER
  62     signal(SIGPIPE, prev_pipe_handler_);
  63 #endif
  64   }
  65  private:
  66   SigHandlerType prev_segv_handler_;
  67   SigHandlerType prev_ill_handler_;
  68 #ifndef _MSC_VER
  69   SigHandlerType prev_pipe_handler_;
  70 #endif
  71 };
  72
  73 // Platform abstraction for setjmp and longjmp
  74 #ifdef _MSC_VER
  75 #define PLUGIN_SETJMP(buf, mask)   setjmp(buf)
  76 #define PLUGIN_LONGJMP(buf, value) longjmp(buf, value)
  77 #define PLUGIN_JMPBUF jmp_buf
  78 #else
  79 #define PLUGIN_SETJMP(buf, mask)   sigsetjmp(buf, mask)
  80 #define PLUGIN_LONGJMP(buf, value) siglongjmp(buf, value)
  81 #define PLUGIN_JMPBUF sigjmp_buf
  82 #endif  // _MSC_VER
  83
  84
  85 // Convert an identifier to a string
  86 inline char* IdentToString(NPIdentifier ident) {
  87   if (NPN_IdentifierIsString(ident)) {
  88     return (char*) NPN_UTF8FromIdentifier(ident);
  89   } else {
  90     static char buf[10];
  91     SNPRINTF(buf, sizeof(buf), "%d", NPN_IntFromIdentifier(ident));
  92     return buf;
  93   }
  94 }
  95
  96 // Debugging print utility
  97
  98 #ifdef SRPC_PLUGIN_DEBUG
  99 #  define dprintf(args) printf args
 100 #else
 101 #  define dprintf(args)
 102 #endif
 103
 104 }  // namespace nacl_srpc
 105
 106 #endif  // NATIVE_CLIENT_NPAPI_PLUGIN_SRPC_UTILITY_H_