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33 lines
734 B
C++
33 lines
734 B
C++
#include <base/mremap.h>
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#include <cstddef>
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#include <cstdlib>
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#include <cstring>
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#include <errno.h>
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void * mremap_fallback(
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void * old_address, size_t old_size, size_t new_size, int flags, int mmap_prot, int mmap_flags, int mmap_fd, off_t mmap_offset)
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{
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/// No actual shrink
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if (new_size < old_size)
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return old_address;
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if (!(flags & MREMAP_MAYMOVE))
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{
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errno = ENOMEM;
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return MAP_FAILED;
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}
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void * new_address = mmap(nullptr, new_size, mmap_prot, mmap_flags, mmap_fd, mmap_offset);
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if (MAP_FAILED == new_address)
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return MAP_FAILED;
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memcpy(new_address, old_address, old_size);
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if (munmap(old_address, old_size))
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abort();
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return new_address;
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}
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