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| Rev | Author | Line No. | Line |
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| 978 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <libc.h> |
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| 30 | #include <unistd.h> |
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| 31 | |||
| 985 | palkovsky | 32 | /** Mremap syscall */ |
| 978 | jermar | 33 | void *mremap(void *address, size_t size, unsigned long flags) |
| 34 | { |
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| 35 | return (void *) __SYSCALL3(SYS_MREMAP, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
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| 36 | } |
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| 985 | palkovsky | 37 | |
| 38 | |||
| 39 | static size_t heapsize = 0; |
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| 40 | /* Start of heap linker symbol */ |
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| 41 | extern char _heap; |
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| 42 | |||
| 43 | /** Sbrk emulation |
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| 44 | * |
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| 45 | * @param size New area that should be allocated or negative, |
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| 46 | if it should be shrinked |
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| 47 | * @return Pointer to newly allocated area |
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| 48 | */ |
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| 49 | void *sbrk(ssize_t incr) |
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| 50 | { |
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| 51 | void *res; |
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| 52 | /* Check for invalid values */ |
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| 53 | if (incr < 0 && -incr > heapsize) |
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| 54 | return NULL; |
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| 55 | /* Check for too large value */ |
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| 56 | if (incr > 0 && incr+heapsize < heapsize) |
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| 57 | return NULL; |
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| 58 | /* Check for too small values */ |
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| 59 | if (incr < 0 && incr+heapsize > heapsize) |
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| 60 | return NULL; |
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| 61 | |||
| 62 | res = mremap(&_heap, heapsize + incr,0); |
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| 63 | if (!res) |
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| 64 | return NULL; |
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| 65 | res = (void *)&_heap + incr; |
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| 66 | heapsize += incr; |
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| 67 | return res; |
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| 68 | } |