socket unix domain IPC代码示例

仅供参考：

服务端：socket->bind->listen->send/recv->close

客户端：socket->bind->connect->send/recv->close

#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/un.h>
#include <pthread.h>
#include <cstring>
#include <cstdio>
#include <unistd.h>
#include <signal.h>

#define filename "test.socket"

void setnonblocking(int fd)
{
	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
}

void *client_func(void *arg)
{
	sleep(3);
	int fd = socket(AF_UNIX, SOCK_STREAM, 0);
	setnonblocking(fd);
	sockaddr_un un;
	memset(&un, 0, sizeof(un));
	un.sun_family = AF_UNIX;
	sprintf(un.sun_path, "file_%d.socket", (int)getpid());
	unlink(un.sun_path);
	socklen_t len = sizeof(un);
	bind(fd, (sockaddr *)&un, sizeof(un));
	strcpy(un.sun_path, filename);
	int ret = connect(fd, (sockaddr *)&un, len);
	if (ret == -1)
	{
		printf("connect server failed...\n");
		close(fd);
		return NULL;
	}
	char buf[256];
	memset(buf, 0, sizeof(buf));
	strcpy(buf, "hello world");
	int n = send(fd, buf, strlen(buf)+1, 0);
	printf("send data, %d bytes..\n", n);
	sleep(5);
	close(fd);

	return NULL;
}

int main()
{
	unlink(filename);	
	signal(SIGPIPE, SIG_IGN);
	int fd = socket(AF_UNIX, SOCK_STREAM, 0);
	int yes = 1;
	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
	setnonblocking(fd);
	sockaddr_un un;
	memset(&un, 0, sizeof(un));
	un.sun_family = AF_UNIX;
	strcpy(un.sun_path, filename);
	bind(fd, (sockaddr *)&un, sizeof(un));
	listen(fd, 100);
	
	pthread_t pid;
	pthread_create(&pid, NULL, client_func, NULL);

	sockaddr_un uu;
	socklen_t len = sizeof(uu);	
	while (true)
	{
		memset(&uu, 0, len);
		int newfd = accept(fd, (sockaddr *)&uu, &len); 
		if (newfd != -1)
		{
			setnonblocking(newfd);
			printf("newfd = %d, path = %s\n", newfd, uu.sun_path);
			char buf[512];
			memset(buf, 0, sizeof(buf));
			int n = recv(newfd, buf, 512,0);
			printf("recv %d bytes, contents is %s\n", n, buf);
		}
		usleep(100000);
	}
	
	close(fd);

	return 0;
}