75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
#include <unistd.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#define DEBUG
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#ifdef DEBUG
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#define dprintf(...) \
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do { \
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char msg[1024]; \
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sprintf(msg, __VA_ARGS__); \
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fprintf(stderr, "%s,%s", __FUNCTION__, msg); \
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} while (0);
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#define eprintf(...) \
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do { \
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char msg[1024]; \
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sprintf(msg, __VA_ARGS__); \
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fprintf(stderr, "%s,%s", __FUNCTION__, msg); \
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} while (0);
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#else
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#define dprintf(...) do { } while (0)
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#define eprintf(...) do { } while (0)
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#endif
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#define CHKANDJUMP(cond, err, ...) \
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do { \
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if(cond) { \
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eprintf(__VA_ARGS__); \
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ret = err; \
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goto fn_fail; \
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} \
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} while(0)
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int sz_unit[] = {
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4 * (1ULL<<10),
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2 * (1ULL<<20),
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1 * (1ULL<<30)};
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#define SZ_INDEX 0
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int main(int argc, char** argv) {
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void* mem;
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int ret = 0;
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int fd;
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fd = open("./file", O_RDWR);
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CHKANDJUMP(fd == -1, 255, "open failed\n");
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mem = mmap(0, 2 * sz_unit[SZ_INDEX], PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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CHKANDJUMP(mem == MAP_FAILED, 255, "mmap failed\n");
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*((unsigned long*)mem) = 0x123456789abcdef0;
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*(unsigned long*)((char*)mem + 1 * sz_unit[SZ_INDEX]) = 0xbeefbeefbeefbeef;
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ret = remap_file_pages(mem + 0 * sz_unit[SZ_INDEX], sz_unit[SZ_INDEX], 0, 1, MAP_SHARED);
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CHKANDJUMP(ret != 0, 255, "remap_file_pages failed\n");
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ret = remap_file_pages(mem + 1 * sz_unit[SZ_INDEX], sz_unit[SZ_INDEX], 0, 0, MAP_SHARED);
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CHKANDJUMP(ret != 0, 255, "remap_file_pages failed\n");
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*((unsigned long*)mem) = 0x123456789abcdef0;
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*(unsigned long*)((char*)mem + 1 * sz_unit[SZ_INDEX]) = 0xbeefbeefbeefbeef;
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munmap(mem, 2 * sz_unit[SZ_INDEX]);
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fn_exit:
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return ret;
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fn_fail:
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goto fn_exit;
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}
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