Last change
on this file since 474 was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
588 bytes
|
Rev | Line | |
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[444] | 1 | #include <_ansi.h> |
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| 2 | #include <errno.h> |
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| 3 | #include <sys/types.h> |
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| 4 | #include <sys/stat.h> |
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| 5 | #include "trap.h" |
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| 6 | |
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| 7 | |
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| 8 | caddr_t |
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| 9 | _sbrk (size_t incr) |
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| 10 | { |
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| 11 | extern char __stack; /* Defined by the linker */ |
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| 12 | extern char _end; /* Defined by the linker */ |
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| 13 | static char *heap_end; |
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| 14 | char *prev_heap_end; |
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| 15 | char *sp = (char *)&sp; |
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| 16 | |
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| 17 | if (heap_end == 0) |
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| 18 | { |
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| 19 | heap_end = &_end; |
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| 20 | } |
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| 21 | prev_heap_end = heap_end; |
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| 22 | heap_end += incr; |
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| 23 | if (heap_end > sp) |
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| 24 | { |
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| 25 | _write (1, "Heap and stack collision\n", 25); |
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| 26 | errno = ENOMEM; |
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| 27 | return (caddr_t)-1; |
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| 28 | } |
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| 29 | return (caddr_t) prev_heap_end; |
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| 30 | } |
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