Last change
on this file since 445 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.2 KB
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Line | |
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1 | /* sbrk.c -- allocate memory dynamically. |
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2 | * |
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3 | * Copyright (c) 1995,1996,1999 Cygnus Support |
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4 | * |
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5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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6 | * and license this software and its documentation for any purpose, provided |
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7 | * that existing copyright notices are retained in all copies and that this |
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8 | * notice is included verbatim in any distributions. No written agreement, |
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9 | * license, or royalty fee is required for any of the authorized uses. |
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10 | * Modifications to this software may be copyrighted by their authors |
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11 | * and need not follow the licensing terms described here, provided that |
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12 | * the new terms are clearly indicated on the first page of each file where |
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13 | * they apply. |
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14 | */ |
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15 | #include <sys/types.h> |
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16 | #include <sys/stat.h> |
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17 | #include "glue.h" |
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18 | |
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19 | caddr_t |
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20 | _sbrk (size_t incr) |
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21 | { |
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22 | static char *heap_end; |
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23 | char *prev_heap_end; |
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24 | char *sp = (char *)&sp; |
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25 | |
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26 | if (heap_end == 0) |
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27 | { |
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28 | heap_end = _end; |
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29 | } |
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30 | prev_heap_end = heap_end; |
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31 | if (heap_end > sp) |
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32 | { |
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33 | _write (1, "Heap and stack collision\n", 25); |
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34 | #if 0 /* Calling abort brings in the signal handling code. */ |
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35 | abort (); |
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36 | #else |
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37 | exit (1); |
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38 | #endif |
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39 | } |
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40 | heap_end += incr; |
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41 | return (caddr_t) prev_heap_end; |
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42 | } |
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