Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ >> 018 >> 019 #include "crt.h" >> 020 #include "libc.h" >> 021 >> 022 >> 023 void * mmap(void *start, size_t length, int prot , int flags, >> 024 const char *path, loff_t offset) >> 025 { >> 026 /* At kernel side, offset is considered positive */ >> 027 if (offset < 0) >> 028 return NULL; >> 029 >> 030 if (0 != _sos_mmap(& start, length, prot, flags, path, offset)) >> 031 return NULL; >> 032 >> 033 return start; >> 034 } >> 035 >> 036 >> 037 void * mremap(void * old_addr, size_t old_len, >> 038 size_t new_len, >> 039 unsigned long flags) >> 040 { >> 041 void * new_uaddr = old_addr; >> 042 if (0 != _sos_mresize(old_addr, old_len, & new_uaddr, new_len, flags)) >> 043 return NULL; >> 044 >> 045 return new_uaddr; >> 046 } >> 047 >> 048 >> 049 /** >> 050 * The presence of this global variable without any protected access >> 051 * to it explains why the "brk/sbrk" functions below are MT-unsafe ! >> 052 */ >> 053 static void * kernel_heap_top = NULL; >> 054 int brk(void *end_data_seg) >> 055 { >> 056 if (! end_data_seg) >> 057 return -1; >> 058 >> 059 kernel_heap_top = _sos_brk(end_data_seg); >> 060 return 0; >> 061 } >> 062 >> 063 >> 064 void *sbrk(ptrdiff_t increment) >> 065 { >> 066 if (! kernel_heap_top) >> 067 kernel_heap_top = _sos_brk(0); >> 068 >> 069 kernel_heap_top = _sos_brk(kernel_heap_top + increment); >> 070 return kernel_heap_top; >> 071 } >> 072 >> 073 >> 074 void * calloc (size_t nmemb, size_t size) >> 075 { >> 076 return malloc(nmemb * size); >> 077 } >> 078 >> 079 >> 080 /** >> 081 * The presence of this global variable without any protected access >> 082 * to it explains why the "malloc/calloc" functions below are >> 083 * MT-unsafe ! >> 084 */ >> 085 static void * malloc_heap_top = NULL; >> 086 void * malloc (size_t size) >> 087 { >> 088 void * retval; >> 089 >> 090 if (size <= 0) >> 091 return NULL; >> 092 >> 093 /* Align on a 4B boundary */ >> 094 size = ((size-1) & ~3) + 4; >> 095 >> 096 if (! kernel_heap_top) >> 097 kernel_heap_top = _sos_brk(0); >> 098 >> 099 if (! malloc_heap_top) >> 100 malloc_heap_top = kernel_heap_top; >> 101 >> 102 retval = malloc_heap_top; >> 103 malloc_heap_top += size; >> 104 >> 105 return retval; >> 106 }
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |