linux进程通信 获取远程系统时间的例子

server.c

--------------------

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define LOCAL_IP "192.168.59.194"

#define LOCAL_PORT 8888

struct sockaddr_in local_sk_addr, client_sk_addr;

int fd_sock,full_sock;

char buf[27];

struct timeval tv;

int length = 0;

int main(void)

{

int lsn_id;

fd_set fdset;

fd_sock = socket(AF_INET, SOCK_STREAM, 0);

bzero(&local_sk_addr, sizeof(local_sk_addr));

local_sk_addr.sin_port = htons(LOCAL_PORT);

local_sk_addr.sin_family = AF_INET;

local_sk_addr.sin_addr.s_addr = inet_addr(LOCAL_IP);

bind(fd_sock, (struct sockaddr*)&local_sk_addr, sizeof(local_sk_addr));

lsn_id = listen(fd_sock, 5);

if (lsn_id != -1)

printf("listen on port %d\n:", LOCAL_PORT);

FILE * file = NULL;

file = fopen("out.txt", "w+");

if (NULL == file){

printf("open out.txt failed.\n");}

while (1)

{

FD_ZERO(&fdset);

if ((full_sock = accept(fd_sock, NULL, NULL))>0 )

{

printf("remote connected!\n");

break;

}

}

while(2)

{

// printf("full_sock:%d\n", full_sock);

//FD_SET(full_sock, &fdset);

//tv.tv_sec = tv.tv_usec = 0;

bzero(buf, 27);

if(0 < recv(full_sock, buf, 26 , 0))

{

fputs(buf, file);

// printf("%s\n", "in!");

printf("remote says:%s\n", buf);

// printf("\n");

}

}

//sleep(1);

/*

if (select(full_sock + 1, &fdset, NULL, NULL, &tv) > 0)

{

printf("data recving!\n");

if(FD_ISSET(full_sock, &fdset))

{

bzero(buf, 27);

if(recv(full_sock, buf, 27 , 0))

{

printf("%s\n", "in!");

printf("remote says:%s\n", buf);

printf("\n");

}

}

}

*/

//close(full_sock);

//close(fd_sock);

// fclose(file);

}

client.c

_____________________________________

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define REMOTE_IP "192.168.59.194"

#define REMOTE_PORT 8888

struct sockaddr_in remote_sk_addr;

int fd_sock;

char buf[27];

struct tm l_time;

void local_time(char* buf)

{

struct timeval tv;

time_t time;

struct tm* st_tm;

gettimeofday(&tv, NULL);

time = tv.tv_sec;

st_tm = localtime((const time_t*)&time);

sprintf(buf,"%d-%d-%d %d:%d:%d.%ld\n",

st_tm->tm_year + 1900,

st_tm->tm_mon + 1,

st_tm->tm_mday,

st_tm->tm_hour,

st_tm->tm_min,

st_tm->tm_sec,

tv.tv_usec);

}

int main(void)

{

fd_set fdset;

fd_sock = socket(AF_INET, SOCK_STREAM, 0);

bzero(&remote_sk_addr, sizeof(remote_sk_addr));

remote_sk_addr.sin_port = htons(REMOTE_PORT);

remote_sk_addr.sin_family = AF_INET;

remote_sk_addr.sin_addr.s_addr = inet_addr(REMOTE_IP);

connect(fd_sock, (struct sockaddr*)&remote_sk_addr, sizeof(remote_sk_addr));

//printf("fd_sock:%d\n", fd_sock);

if(fd_sock != -1)

{

printf("connected to remote!");

}

printf("\n");

while (1)

{

// FD_ZERO(&fdset);

// FD_SET(fd_sock, &fdset);

bzero(buf, 27);

local_time(buf);

printf("%s\n", buf);

// send(fd_sock, buf, 27, 0);

sendto(fd_sock, buf, 27, 0, (struct sockaddr*) &remote_sk_addr,sizeof(remote_sk_addr));

sleep(2);

}

// close(fd_sock);

}