客户端和服务端通信的多种函数的对比。linux 网络编程

第一种普通的read recv write

Makefile

#LOCAL_LIBRARY +=  -L./lib -lpal
#LOCAL_LDFLAGS += -lm -lopus -lwebsockets -lpthread -ldl
#LOCAL_CFLAGS += -I./include
#
#
TARGETS1 = client
TARGETS2 = service
CC:=gcc

SRCS1 = client.cc process.cc
SRCS2 = server.cc process.cc
OBJS1 = $(patsubst %.cc, %.o, $(SRCS1))
OBJS2 = $(patsubst %.cc, %.o, $(SRCS2))

CFLAGS += $(LOCAL_CFLAGS)
LDFLAGS += $(LOCAL_LIBRARY) $(LOCAL_LDFLAGS)

all: $(TARGETS1) $(TARGETS2)

$(TARGETS1):$(OBJS1)
	$(CC)  -o $@ $^  $(LDFLAGS) $(CFLAGS)

$(TARGETS2):$(OBJS2)
	$(CC)  -o $@ $^  $(LDFLAGS) $(CFLAGS)

$(OBJS1): %.o:%.cc
	$(CC) -c $< -o $@ $(CFLAGS)

$(OBJS2): %.o:%.cc
	$(CC) -c $< -o $@ $(CFLAGS)
clean :
	@rm -rf $(TARGETS1) $(OBJS1)

#.SUFFIXES:
.PHONY : all clean

客户端的处理函数

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
extern void sig_proccess(int signo);
extern void sig_pipe(int signo);
extern void process_conn_client(int signo);
static int s;
void sig_proccess_client(int signo)
{
    printf("Catch a exit signal\n");
    close(s);
    exit(0);
}
#define PORT 8888
int main(int argc,char *argv[])
{
    struct sockaddr_in server_addr;
    int err;

    if(argc == 1)
    {
        printf("PLS input server addr\n");
        return 0;
    }
    signal(SIGINT, sig_proccess);
    signal(SIGPIPE, sig_pipe);

    s = socket(AF_INET, SOCK_STREAM, 0);
    if(s < 0)
    {
        printf("socket error\n");
        return -1;
    }
    /*设置服务器地址*/
    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(PORT);

    inet_pton(AF_INET, argv[1], &server_addr.sin_addr);

    connect(s, (struct sockaddr*)&server_addr, sizeof(struct sockaddr));

    process_conn_client(s);
    close(s);
    return 0;
}

服务端的处理函数

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/unistd.h>
#include <netinet/in.h>
#include <signal.h>
extern void sig_proccess(int signo);
extern void process_conn_server(int signo);
#define PORT 8888
#define BACKLOG 2
int main(int argc, char *argv[])
{
    int ss,sc;
    struct sockaddr_in server_addr;
    struct sockaddr_in client_addr;
    int err;
    pid_t pid;
    signal(SIGINT, sig_proccess);
    signal(SIGPIPE, sig_proccess);

    ss = socket(AF_INET, SOCK_STREAM, 0);
    if(ss < 0)
    {
        printf("socket error\n");
        return -1;
    }

    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(PORT);

    err = bind(ss, (struct sockaddr*)&server_addr, sizeof(server_addr));
    if(err < 0)
    {
        printf("listen error %d \n",errno);
        return -1;
    }
    err =listen(ss, BACKLOG);
    if(err < 0)
    {
        printf("listen error\n");
        return -1;
    }

    for(;;)
    {
        socklen_t addrlen = sizeof(struct sockaddr);
        sc = accept(ss, (struct sockaddr*)&client_addr, &addrlen);
        if(sc < 0)
        {
            continue;
        }

        pid = fork();
        if( pid == 0 )
        {
            close(ss);
            process_conn_server(sc);
        }else{
            close(sc);
        }
    }
}

公用的处理函数

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
/*服务器对客户端的处理*/
void process_conn_server(int s)
{
	ssize_t size = 0;
	char buffer[1024];						/*数据的缓冲区*/

	for(;;){								/*循环处理过程*/
		size = recv(s, buffer, 1024,0);
								/*从套接字中读取数据放到缓冲区buffer中*/
		if(size == 0){						/*没有数据*/
			return;
		}

		sprintf(buffer, "%d bytes altogether\n", size);
								/*构建响应字符，为接收到客户端字节的数量*/
		send(s, buffer, strlen(buffer)+1,0);		/*发给客户端*/
	}
}

/*客户端的处理过程*/
void process_conn_client(int s)
{
	ssize_t size = 0;
	char buffer[1024];							/*数据的缓冲区*/

	for(;;){									/*循环处理过程*/
		size = read(0, buffer, 1024);
								/*从标准输入中读取数据放到缓冲区buffer中*/
		if(size > 0){							/*读到数据*/
			send(s, buffer, size,0);			/*发送给服务器*/
			size = recv(s, buffer, 1024,0);	/*从服务器读取数据*/
			write(1, buffer, size);				/*写到标准输出*/
		}
	}
}

/*信号SIGINT的处理函数*/
void sig_proccess(int signo)
{
	printf("Catch a exit signal\n");
	_exit(0);
}

/*信号SIGPIPE的处理函数*/
void sig_pipe(int sign)
{
	printf("Catch a SIGPIPE signal\n");

	/*释放资源*/
}

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