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#include <sys/mman.h>
#include <errno.h>
#include <stdint.h>
#include "alloc.h"
#include "common.h"
#include "errors.h"
/* TODO: Support malloc() backend for systems without MAP_ANON */
#ifndef MAP_ANON
# error "System not supported (missing MAP_ANON)"
#endif
#if DEBUG
# define TMP_DFLT_BUFSZ (8)
#else /* Probably super overkill, but that’s fine */
# define TMP_DFLT_BUFSZ (1 * 1024)
#endif
void *
tmpalloc(scratch_t *s, size_t nmemb, size_t size)
{
if (unlikely(size > SIZE_MAX / nmemb)) {
errno = ENOMEM;
err("%s:", __func__);
}
size *= nmemb;
if (s->p == NULL) {
#if !__linux__
do_mmap:
#endif
s->sz = MAX(size, TMP_DFLT_BUFSZ);
s->p = mmap(s->p, s->sz, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (s->p == MAP_FAILED)
err("mmap:");
} else if (size > s->sz) {
#if __linux__
if ((s->p = mremap(s->p, s->sz, size, MREMAP_MAYMOVE)) == MAP_FAILED)
err("mremap:");
s->sz = size;
#else
munmap(s->p, s->sz);
goto do_mmap;
#endif
}
return s->p;
}
void
tmpfree(scratch_t *s)
{
munmap(s->p, s->sz);
}
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