nonnacl_util/sel_ldr_launcher.cc

   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 #include "native_client/nonnacl_util/sel_ldr_launcher.h"
  34
  35 #include <stdio.h>
  36 #include <sys/types.h>
  37
  38 #include "native_client/include/nacl_elf.h"
  39
  40 namespace nacl {
  41
  42 SelLdrLauncher::SelLdrLauncher() :
  43   child_(kInvalidHandle),
  44   channel_(kInvalidHandle),
  45   argc_(-1),
  46   argv_(NULL),
  47   is_sel_ldr_(true) {
  48 }
  49
  50 void SelLdrLauncher::BuildArgv(const char* sel_ldr_pathname,
  51                                const char* application_name,
  52                                int imc_fd,
  53                                Handle imc_channel_handle,
  54                                int sel_ldr_argc,
  55                                const char* sel_ldr_argv[],
  56                                int application_argc,
  57                                const char* application_argv[]) {
  58 #if NACL_WINDOWS
  59   _snprintf_s(channel_buf_, sizeof(channel_buf_), sizeof(channel_buf_),
  60               "%d:%u", imc_fd, imc_channel_handle);
  61   _snprintf_s(channel_number_, sizeof(channel_number_), sizeof(channel_number_),
  62               "%d", imc_fd);
  63 #else
  64   snprintf(channel_buf_,
  65            sizeof(channel_buf_),
  66            "%d:%d",
  67            imc_fd,
  68            imc_channel_handle);
  69   snprintf(channel_number_, sizeof(channel_number_), "%d", imc_fd);
  70 #endif
  71   // Fixed args are:
  72   // .../sel_ldr -f <application_name> -i <NaCl fd>:<imcchannel#>
  73   const char* kFixedArgs[] = {
  74     const_cast<char*>(sel_ldr_pathname),
  75     "-f",
  76     const_cast<char*>(application_name),
  77     "-i",
  78     channel_buf_
  79   };
  80   const int kFixedArgc = sizeof(kFixedArgs) / sizeof(kFixedArgs[0]);
  81
  82   argv_ = new char const*[kFixedArgc + sel_ldr_argc
  83                           + (application_argc + 1) + 1];
  84   // We use pre-increment everywhere, so we need to initialize to -1.
  85   argc_ = -1;
  86
  87   // Copy the fixed arguments to argv_.
  88   for (int i = 0; i < kFixedArgc; ++i) {
  89     argv_[++argc_] = kFixedArgs[i];
  90   }
  91   // Copy the specified additional arguments (e.g., "-d" or "-P") to sel_ldr
  92   for (int i = 0; i < sel_ldr_argc; ++i) {
  93     argv_[++argc_] = sel_ldr_argv[i];
  94   }
  95   // Copy the specified arguments to the application
  96   if (application_argc > 0) {
  97     argv_[++argc_] = "--";
  98     for (int i = 0; i < application_argc; ++i) {
  99       if (strncmp("$CHAN", application_argv[i], 6) == 0) {
 100         argv_[++argc_] = channel_number_;
 101       } else {
 102         argv_[++argc_] = application_argv[i];
 103       }
 104     }
 105   }
 106   // NULL terminate the argument list.
 107   argv_[++argc_] = NULL;
 108 }
 109
 110 }  // namespace nacl