service_runtime/main.c

   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 <stdio.h>
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36
  37 #include <dlfcn.h>
  38
  39 #define DEFAULT_START   "NaClMain"
  40
  41 int verbosity = 0;
  42
  43 void usage(void) {
  44   fprintf(stderr, "Usage: nacl [-v?] target.so\n");
  45 }
  46
  47 int LoadAndRun(char *dlfile,
  48                char const *entry_pt,
  49                int verbosity) {
  50   void *dlhandle;
  51   void (*fn)(void);
  52   char *error;
  53
  54   if (verbosity >= 2) {
  55     fprintf(stderr, "Requested %s to be loaded and run\n", dlfile);
  56   }
  57   dlhandle = dlopen(dlfile, RTLD_NOW | RTLD_LOCAL | RTLD_DEEPBIND);
  58
  59   if (NULL == dlhandle) {
  60     if (verbosity >= 1) {
  61       fprintf(stderr, "Load of %s failed\n", dlfile);
  62       fprintf(stderr, "Error: %s\n", dlerror());
  63     }
  64     return 0;
  65   }
  66
  67   *(void **) &fn = dlsym(dlhandle, entry_pt);
  68   if (NULL == fn || NULL != (error = dlerror())) {
  69     if (verbosity >= 1) {
  70       fprintf(stderr, "Entry point %s not found in %s",
  71               entry_pt, dlfile);
  72     }
  73     return 0;
  74   }
  75
  76   if (verbosity >= 1) {
  77     fprintf(stderr, "Calling entry point %s\n", entry_pt);
  78   }
  79   (*fn)();
  80   if (verbosity >= 1) {
  81     fprintf(stderr, "Done, closing handle\n");
  82   }
  83
  84   dlclose(dlhandle);
  85   return 1;
  86 }
  87
  88 int main(int argc, char **argv) {
  89   int opt;
  90   int ix;
  91   char const  *entry_pt = DEFAULT_START;
  92   while ((opt = getopt(argc, argv, "s:v")) != -1) switch (opt) {
  93       case 's':
  94         entry_pt = optarg;
  95         break;
  96       case 'v':
  97         ++verbosity;
  98         break;
  99       default:
 100         usage();
 101         exit(1);
 102   }
 103
 104   for (ix = optind; ix < argc; ++ix) {
 105     if (!LoadAndRun(argv[ix], entry_pt, verbosity)) {
 106       return 1;
 107     }
 108   }
 109   return 0;
 110 }