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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  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
  7.  * are 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 copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup fs
  30.  * @{
  31.  */
  32. /** @file
  33.  * @brief Program Control Block interface.
  34.  */
  35.  
  36. #ifndef LIBC_PCB_H_
  37. #define LIBC_PCB_H_
  38.  
  39. #include <sys/types.h>
  40.  
  41. typedef void (*entry_point_t)(void);
  42.  
  43. /** Program Control Block.
  44.  *
  45.  * Holds pointers to data passed from the program loader to the program
  46.  * and/or to the dynamic linker. This includes the program entry point,
  47.  * arguments, environment variables etc.
  48.  */
  49. typedef struct {
  50.     /** Program entry point. */
  51.     entry_point_t entry;
  52.  
  53.     /** Number of command-line arguments. */
  54.     int argc;
  55.     /** Command-line arguments. */
  56.     char **argv;
  57.  
  58.     /*
  59.      * ELF-specific data.
  60.      */
  61.     /** Pointer to ELF dynamic section of the program. */
  62.     void *dynamic;
  63.     /** Pointer to dynamic linker state structure (runtime_env_t). */
  64.     void *rtld_runtime;
  65. } pcb_t;
  66.  
  67. /**
  68.  * A pointer to the program control block. Having received the PCB pointer,
  69.  * the C library startup code stores it here for later use.
  70.  */
  71. extern pcb_t *__pcb;
  72.  
  73. #endif
  74.  
  75. /**
  76.  * @}
  77.  */
  78.