shmem

#include <stdlib.h>#include <stdio.h>#include <string.h>#include <errno.h>#include <unistd.h>#include <sys/stat.h>#include <sys/types.h>#include <sys/ipc.h>#include <sys/shm.h>#define PERM S_IRUSR|S_IWUSR/* 共享内存 */int main(int argc,char **argv) { int shmid; char *p_addr,*c_addr; if(argc!=2) { fprintf(stderr,"Usage:%s\n\a",argv[0]); exit(1); }/* 创建共享内存 */if((shmid=shmget(IPC_PRIVATE,1024,PERM))==-1) { fprintf(stderr,"Create Share Memory Error:%s\n\a",strerror(errno)); exit(1); } /* 创建子进程 */if(fork()) // 父进程写{ p_addr=shmat(shmid,0,0); memset(p_addr,'\0',1024); strncpy(p_addr,argv[1],1024);wait(NULL); // 释放资源,不关心终止状态exit(0); } else       // 子进程读{ sleep(1); // 暂停1秒c_addr=shmat(shmid,0,0); printf("Client get %p\n",c_addr); exit(0); } }