//linuc command ===>man ====>pipe,mkfifo,kill&signal,semget,shmget,msgget,inet_addr
//三次握手四次挥手
//client==>connect req,
//server==>ack,
//client===>ack
//
//client==>req cloce
//server==>ack
//client==>ack
//server==>make sure ack
### 1 无名管道
#include <stdio.h>
#include <iostream>
#include <unistd.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
int main(void)
{
int pipefd[2];
int pfd = pipe(pipefd);
println(%s,"[PROC 1]");
if(pfd == -1)
{
perror("pfd error");
return EPIPE;
}
pid_t pid = fork();
if(pid == -1)
{
perror(format(fork error));
}
if(pid == 0)
{
println(%s,"child process");
write(pipefd[1],(void *)"hellomyfather\n",sizeof(format(formathellomyfather)));
}
if(pid > 0 )
{
println(%s,"parent process");
char* buff[0xff];
read(pipefd[0],(void*)buff,sizeof(format(formathellomyfather)));
println(parent recv from child %s,(char *)buff);
}
return 0;
}
###
### 有名管道
#include <stdio.h>
#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
int main(void)
{
const char *pathname = "./fifofile";//path & fileName
println(%s,"[PROC 1]");
if(access(pathname,R_OK|W_OK) == F_OK) //check file isexist
{
println(%s,"file exist");
}
int ret = mkfifo(pathname, 0666);
if(!ret )
{
perror("mkfifo error"); //run 1,print error cause creating a fifo file,you run 2 is ok!
return -1;
}
int fd = open(pathname,O_RDWR);
if(fd == -1)
{
perror("file open error");
}
const char buff[0xff] = "hello process 2,i`m process 1";
write(fd,buff,sizeof(buff));
println("%s","-----------");
while(1);
return 0;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
int main(void)
{
const char *pathname = "./fifofile";//path & fileName
println(%s,"[PROC 2]");
int ret ;
int fd = open(pathname,O_RDWR);
if(fd == -1)
{
perror("file open error");
}
char buff[0xff] ;
read(fd,buff,sizeof(buff));
println(%s,buff);
while(1);
return 0;
}
###
### 信号
#include <stdio.h>
#include <iostream>
#include <sys/types.h>
#include <signal.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
int main(int argc,char *argv[])
{
if(argc != 2)
{
perror("argc error ,cause itis not 2");
return -1;
}
int pid = atoi(argv[1]);
kill(pid,SIGUSR1);
println("pid is:%d",pid);
while(1);
return 0;
}
///////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <iostream>
#include <sys/types.h>
#include <signal.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
void sighandler (int v)
{
println("sig is==>%d",v);
}
int main(void)
{
sighandler_t ptr = signal(SIGUSR1,sighandler);
if(ptr == SIG_ERR)
{
perror("gignal error");
}
while(1);
return 0;
}
###
###消息队列
#include <stdio.h>
#include <iostream>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
static key_t g_key = 119;
int main(int argc,char *argv[])
{
int msgid = msgget(g_key,0666|IPC_CREAT);
println(msgid is %d,msgid);
char buff[0xff] = "hello proc2 ,i`m proc 1";
msgsnd(msgid,buff,sizeof(buff),0);
while(1);
return 0;
}
////////////////////////////////////////////////////////////
#include <stdio.h>
#include <iostream>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
static key_t g_key = 119;
int main(void)
{
int msgid = msgget(g_key,0666|IPC_CREAT);
println(msgid is %d,msgid);
char buff[0xff] ;
msgrcv(msgid,buff,sizeof(buff),0,0);
println("RECV %s",buff);
while(1);
return 0;
}
###
### 信号量
#include <stdio.h>
#include <iostream>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
static key_t g_key = 119;
int main(int argc,char *argv[])
{
int semid = semget(g_key,0,0);
println(semid is %d,semid);
semctl(semid,0,SETVAL,99);
while(1);
return 0;
}
///////////////////////////////////////////////////////////////
#include <stdio.h>
#include <iostream>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
static key_t g_key = 119;
int main(void)
{
int semid = semget(g_key,0,0);
println(semid is %d,semid);
int result = semctl(semid,0,GETVAL,0);
println("recv = %d",result);
while(1);
return 0;
}
###
### 共享内存
#include <stdio.h>
#include <iostream>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>
#define format(x) #x "\n"
#define println(fmt, var) fprintf(stderr, format(fmt), var)
static key_t g_key = 119;
int main(int argc, char *argv[])
{
int shid = shmget(g_key, 1024, 0666 | IPC_CREAT);
char *p = (char *)shmat(shid, nullptr, 0);
strcpy(p, "hellosharememory");
while (1)
;
return 0;
}
///////////////////////////////////////////////////////////
#include <stdio.h>
#include <iostream>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>
#define format(x) #x "\n"
#define println(fmt, var) fprintf(stderr, format(fmt), var)
static key_t g_key = 119;
int main(void)
{
int shid = shmget(g_key, 1024, 0666 | IPC_CREAT);
char *p = (char *)shmat(shid, nullptr, 0);
println("recv====>%s", p);
int ret = shmdt(p);
if (ret < 0)
{
perror("shmdt error");
}
ret = shmctl(shid, IPC_RMID, nullptr);
if (ret < 0)
{
perror("shmctl error");
}
println("be cleaned====%p", p);
while (1)
;
return 0;
}
###
###套接字
#include <stdio.h>
#include <iostream>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define format(x) #x "\n"
#define println(fmt, var) fprintf(stderr, format(fmt), var)
//1
//man nanrenaiwangluodizhi ===>man inet_addr//for head file & ip addr
//2
//socket fd
//3
//server ipendport
//4
//bind
//5
//listen
//6
//client ipendport
//7
//accept
//8
//send & recv
int main(int argc, char *argv[])
{
int serverfd,clientfd;
struct sockaddr_in addri,clientipendport;
serverfd = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);//域名:domain
addri.sin_addr.s_addr = inet_addr("127.0.0.1");
addri.sin_family = AF_INET;
addri.sin_port = htons(9000);
int ret = bind(serverfd,(const struct sockaddr *)&addri,sizeof(addri));
if(ret <0 )
{
perror("bind error");
}
ret = listen(serverfd,10);
if(ret <0 )
{
perror("listen error");
}
int len = sizeof(clientipendport);
clientfd = accept(serverfd,( sockaddr *)&clientfd,(socklen_t *)&len);
if(clientfd <0 )
{
perror("accept error");
}
char buf []= "hello i`m proc 1";
send(clientfd,buf,sizeof(buf),0);
while (1)
;
return 0;
}
//////////////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <iostream>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#define format(x) #x "\n"
#define println(fmt,var) fprintf(stderr,format(fmt),var)
int main(void)
{
int clientfd;
struct sockaddr_in addri;
addri.sin_addr.s_addr = inet_addr("127.0.0.1");
addri.sin_family = AF_INET;
addri.sin_port = htons(9000);
clientfd = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
connect(clientfd,(const sockaddr *)&addri,sizeof(addri));
char buf [0xff];
recv(clientfd,buf,sizeof(buf),0);
println(recv is==>%s,buf);
while(1);
return 0;
}
###
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