53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/memfd.h>
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#include <sys/syscall.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include "network.h"
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#include "swap.h"
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int make_swap(rbt_msg *swap)
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{
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swap->state = NEWMSG;
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sem_post(&swap->status);
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}
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int create_swap(const char *name)
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{
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int fd = memfd_create(name,0);
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//申请共享内存
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ftruncate(fd, sizeof(rbt_msg));
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//调整关闭策略
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int flags = fcntl(fd, F_GETFD);
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flags &= ~FD_CLOEXEC;
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fcntl(fd, F_SETFD, flags);
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//调整大小
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rbt_msg *init_msg = (rbt_msg*)mmap(NULL, sizeof(rbt_msg), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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char buf[MAX_MESSAGE_BUF] = {'\0'};
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//初始化
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memcpy(init_msg->raw_message,buf,MAX_MESSAGE_BUF);
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memcpy(init_msg->nickname,buf,64);
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sem_init(&init_msg->status,1,1);
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init_msg->raw_message[0] = '\0';
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init_msg->state = FREE;
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init_msg->uid[0] = '\0';
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munmap((void*)init_msg,sizeof(rbt_msg));
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return fd;
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}
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int close_swap(int shmid,rbt_msg *swap)
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{
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swap->state = QUITPLG;//置退出态
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sem_post(&swap->status);//发送信号量
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close(shmid);//关闭共享内存
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} |