20 lines
517 B
C
20 lines
517 B
C
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#include "../factor.h"
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void *alloc_guarded(CELL size)
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{
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int pagesize = getpagesize();
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char* array = mmap((void*)0,pagesize + size + pagesize,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_ANON | MAP_PRIVATE,-1,0);
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if(mprotect(array,pagesize,PROT_NONE) == -1)
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fatal_error("Cannot allocate low guard page",(CELL)array);
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if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
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fatal_error("Cannot allocate high guard page",(CELL)array);
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/* return bottom of actual array */
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return array + pagesize;
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}
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