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76 lines
1.3 KiB
C
76 lines
1.3 KiB
C
/*
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* BIRD Internet Routing Daemon -- Raw allocation
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*
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* (c) 2020 Maria Matejka <mq@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "lib/resource.h"
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef HAVE_MMAP
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#include <sys/mman.h>
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#endif
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long page_size = 0;
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#ifdef HAVE_MMAP
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static _Bool use_fake = 0;
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#else
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static _Bool use_fake = 1;
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#endif
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void resource_sys_init(void)
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{
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#ifdef HAVE_MMAP
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if (!(page_size = sysconf(_SC_PAGESIZE)))
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die("System page size must be non-zero");
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if ((u64_popcount(page_size) > 1) || (page_size > 16384))
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{
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#endif
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/* Too big or strange page, use the aligned allocator instead */
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page_size = 4096;
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use_fake = 1;
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}
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}
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void *
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alloc_sys_page(void)
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{
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#ifdef HAVE_MMAP
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if (!use_fake)
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{
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void *ret = mmap(NULL, page_size, PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (ret == MAP_FAILED)
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bug("mmap(%lu) failed: %m", page_size);
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return ret;
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}
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else
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#endif
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{
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void *ret = aligned_alloc(page_size, page_size);
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if (!ret)
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bug("aligned_alloc(%lu) failed", page_size);
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return ret;
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}
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}
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void
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free_sys_page(void *ptr)
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{
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#ifdef HAVE_MMAP
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if (!use_fake)
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{
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if (munmap(ptr, page_size) < 0)
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bug("munmap(%p) failed: %m", ptr);
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}
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else
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#endif
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free(ptr);
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}
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