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27 lines
620 B
C
27 lines
620 B
C
#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <__macro_PAGESIZE.h>
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/* Bare-bones implementation of sbrk: just call memory.grow. */
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void *sbrk(intptr_t increment) {
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/* We only support page-size increments. */
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if (increment % PAGESIZE != 0) {
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abort();
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}
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/* WebAssembly doesn't support shrinking linear memory. */
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if (increment < 0) {
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abort();
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}
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uintptr_t old = __builtin_wasm_memory_grow(0, (uintptr_t)increment / PAGESIZE);
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if (old == SIZE_MAX) {
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errno = ENOMEM;
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return (void *)-1;
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}
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return (void *)(old * PAGESIZE);
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}
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