Last change
on this file since 492 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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Rev | Line | |
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[444] | 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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