30 lines
750 B
V
30 lines
750 B
V
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module builtin
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fn mm_alloc(size u64) (&byte, Errno) {
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// BEGIN CONSTS
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// the constants need to be here, since the initialization of other constants,
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// which happen before these ones would, require malloc
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mem_prot := MemProt(int(MemProt.prot_read) | int(MemProt.prot_write))
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map_flags := MapFlags(int(MapFlags.map_private) | int(MapFlags.map_anonymous))
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// END CONSTS
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a, e := sys_mmap(&byte(0), size + sizeof(u64), mem_prot, map_flags, -1, 0)
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if e == .enoerror {
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unsafe {
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mut ap := &u64(a)
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*ap = size
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x2 := &byte(a + sizeof(u64))
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return x2, e
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}
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}
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return &byte(0), e
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}
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fn mm_free(addr &byte) Errno {
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unsafe {
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ap := &u64(addr - sizeof(u64))
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size := *ap
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return sys_munmap(addr - sizeof(u64), size + sizeof(u64))
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}
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}
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