#include <stdlib.h>
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#include <stdio.h>
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#include <errno.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 <sys/stat.h>
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#include "memfd.h"
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#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); \
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} while (0)
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int main(int argc, char *argv[])
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{
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int fd;
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char *name;
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ssize_t i, len;
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unsigned char* paddr;
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struct stat st;
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int ret = 0;
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if (argc < 3) {
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fprintf(stderr, "%s name size\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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name = argv[1];
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len = atoi(argv[2]) * 1024LU * 1024LU * 1024LU;
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/* Create an anonymous file in tmpfs; */
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fd = basic_shm_create(name, len);
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if (fd == -1)
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errExit("memfd_create");
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/* Size the file as specified on the command line */
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ret = basic_shm_mmap (fd, &paddr);
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if (ret < 0)
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errExit("basic_shm_mmap");
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for (i = 0; i < len; ++i)
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paddr[i] = i & 0x000000FF;
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if (fstat (fd, &st))
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errExit ("fstat");
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printf("length: %zu, atime: %lu.%lu\n", len, st.st_atim.tv_sec, st.st_atim.tv_nsec);
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fprintf(stderr, "pid:%d,fd:%d\n", getpid(), fd);
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/* Keep running, so that the file created by memfd_create()
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continues to exist */
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sleep (120);
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//pause();
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printf("length: %zu, atime: %lu.%lu\n", len, st.st_atim.tv_sec, st.st_atim.tv_nsec);
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ret = basic_shm_unmmap(fd, &paddr);
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if (ret < 0)
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errExit("basic_shm_unmmap");
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/*open to test again*/
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fd = basic_shm_open(fd, 0, 0);
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if (fd <= 0)
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errExit("basic_shm_open");
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ret = basic_shm_mmap (fd, &paddr);
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if (ret < 0)
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errExit("basic_shm_mmap");
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printf ("start: ");
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for (i = 0; i < 32; ++i)
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printf ("%i ", paddr[i]);
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printf ("\nend: ");
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for (i = 0; i < 32; ++i)
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printf ("%i ", paddr[len-32+i]);
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printf ("\ndone\n");
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ret = basic_shm_unmmap(fd, &paddr);
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if (ret < 0)
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errExit("basic_shm_unmmap");
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basic_shm_close(fd);
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exit(EXIT_SUCCESS);
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}
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