31 lines
843 B
C
31 lines
843 B
C
/*************************************************************************
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> File Name : ipc_share_mem_posix_write.c
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> Author : TL Song
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> EMail : songtianlun@frytea.com
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> Created Time : Wed 30 Dec 2020 03:17:00 PM CST
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************************************************************************/
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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int main(int argc, char ** argv)
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{
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int fd = shm_open("posixsm", O_CREAT | O_RDWR, 0666);
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ftruncate(fd, 0x400000);
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char *p = mmap(NULL, 0x400000, PROT_READ| PROT_WRITE, MAP_SHARED, fd, 0);
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char cIndex = 'A';
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int i = 0;
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for(i=0;i<100;i++){
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memset(p, cIndex++, 0x400000);
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printf("Write '%c' to mem '%p'\n", *p, p);
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sleep(1);
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}
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munmap(p, 0x400000);
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return 0;
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}
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