lib/libsys/genhooks/genhooks.c

   1 /*
   2  * Copyright (c) 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/lib/libsys/genhooks/genhooks.c,v 1.2 2005/12/05 16:48:22 dillon Exp $
  35  */
  36 /*
  37  * GENHOOKS [-u] [-l] [-s listfile] [-o outfile] infile(s)
  38  *
  39  * Generate assembly hooks for the actual system calls.  This program
  40  * will either generate hooks for user programs, or it will generate
  41  * the assembly for the actual syscall layer file.
  42  */
  43
  44 #include "defs.h"
  45
  46 static void usage(const char *argv0);
  47
  48 int
  49 main(int ac, char **av)
  50 {
  51     enum { OUTPUT_NONE, OUTPUT_USER,
  52            OUTPUT_LIB, OUTPUT_STANDALONE } output_type = OUTPUT_NONE;
  53     const char *argv0 = av[0];
  54     const char *list_prefix = NULL;
  55     FILE *fo = NULL;
  56     int i;
  57     int ch;
  58
  59     while ((ch = getopt(ac, av, "uls:o:")) != -1) {
  60         switch(ch) {
  61         case 'u':
  62             output_type = OUTPUT_USER;
  63             break;
  64         case 's':
  65             output_type = OUTPUT_STANDALONE;
  66             list_prefix = optarg;
  67             break;
  68         case 'l':
  69             output_type = OUTPUT_LIB;
  70             break;
  71         case 'o':
  72             fo = fopen(optarg, "w");
  73             if (fo == NULL) {
  74                 err(1, "Unable to create %s", optarg);
  75                 /* not reached */
  76             }
  77             break;
  78         default:
  79             usage(argv0);
  80             /* not reached */
  81         }
  82     }
  83     ac -= optind;
  84     av += optind;
  85     if (output_type == OUTPUT_NONE) {
  86         errx(1, "No output format specified");
  87         /* not reached */
  88     }
  89     if (ac == 0) {
  90         errx(1, "No input files specified");
  91         /* not reached */
  92     }
  93     for (i = 0; i < ac; ++i) {
  94         parse_file(av[i]);
  95     }
  96     if (fo == NULL)
  97         fo = stdout;
  98
  99     switch(output_type) {
 100     case OUTPUT_USER:
 101         output_user(fo);
 102         break;
 103     case OUTPUT_LIB:
 104         output_lib(fo);
 105         break;
 106     case OUTPUT_STANDALONE:
 107         output_standalone(fo, list_prefix);
 108         break;
 109     default:
 110         break;
 111     }
 112     if (fo != stdout)
 113         fclose(fo);
 114     return(0);
 115 }
 116
 117 static void
 118 usage(const char *argv0)
 119 {
 120     fprintf(stderr, "%s [-u] [-l] [-s outprefix] [-o outfile] infiles...\n",
 121             argv0);
 122     exit(1);
 123 }
 124
 125 void *
 126 zalloc(int bytes)
 127 {
 128     void *ptr;
 129
 130     ptr = malloc(bytes);
 131     assert(ptr != NULL);
 132     bzero(ptr, bytes);
 133     return(ptr);
 134 }
 135