108 lines
3.2 KiB
C
108 lines
3.2 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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#include <errno.h>
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#include <sys/wait.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <xpmem.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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#define CONFIG_64K_PAGE
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#ifdef CONFIG_64K_PAGE
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int sz_mem[] = {
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(1ULL << 16), /* 64KiB */
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(1ULL << 25), /* 32MiB */
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(1ULL << 29), /* 512MiB */
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(1ULL << 27)}; /* 128MiB */
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#else /* CONFIG_4K_PAGE */
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int sz_mem[] = {
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4 * (1ULL<<10), /* 4096(4KiB) */
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2 * (1ULL<<20), /* 2097152(2MiB) */
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1 * (1ULL<<30), /* 1073741824(1GiB) */
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134217728}; /* 128MiB */
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#endif
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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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pid_t pid;
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int status;
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xpmem_segid_t segid;
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mem = mmap(0, sz_mem[SZ_INDEX], PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
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CHKANDJUMP(mem == MAP_FAILED, 255, "mmap failed\n");
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memset(mem, 0, sz_mem[SZ_INDEX]);
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ret = xpmem_init();
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CHKANDJUMP(ret != 0, 255, "xpmem_init failed: %s\n", strerror(errno));
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segid = xpmem_make(mem, sz_mem[SZ_INDEX], XPMEM_PERMIT_MODE, (void*)0666);
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CHKANDJUMP(segid == -1, 255, "xpmem_ioctl failed: %s\n", strerror(errno));
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pid = fork();
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CHKANDJUMP(pid == -1, 255, "fork failed\n");
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if(pid == 0) {
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xpmem_apid_t apid = xpmem_get(segid, XPMEM_RDWR, XPMEM_PERMIT_MODE, NULL);
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CHKANDJUMP(apid == -1, 255, "xpmem_get failed: %s\n", strerror(errno));
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struct xpmem_addr addr = { .apid = apid, .offset = 0 };
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void* attach = xpmem_attach(addr, sz_mem[SZ_INDEX], NULL);
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CHKANDJUMP(attach == (void*)-1, 255, "xpmem_attach failed: %s\n", strerror(errno));
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*((unsigned long*)attach) = 0x1234;
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ret = xpmem_detach(attach);
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CHKANDJUMP(ret == -1, 255, "xpmem_detach failed\n");
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_exit(123);
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} else {
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ret = waitpid(pid, &status, 0);
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CHKANDJUMP(ret == -1, 255, "waitpid failed\n");
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printf("%lx\n", *((unsigned long*)mem));
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ret = xpmem_remove(segid);
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CHKANDJUMP(ret == -1, 255, "xpmem_remove failed\n");
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}
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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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