79 lines
1.7 KiB
C
79 lines
1.7 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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#include "util.h"
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#define DEBUG
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int sz_mem[] = {
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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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134217728};
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#define SZ_INDEX 0
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int main(int argc, char **argv)
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{
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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,
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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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segid = xpmem_make(mem, sz_mem[SZ_INDEX], XPMEM_PERMIT_MODE,
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(void *)0666);
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CHKANDJUMP(segid == -1, 255, "xpmem_ioctl failed: %s\n",
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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,
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XPMEM_PERMIT_MODE, NULL);
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CHKANDJUMP(apid == -1, 255, "xpmem_get failed: %s\n",
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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,
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"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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