如何在c中多线程化这个TCP服务器/客户端？ 请帮我多线程化这段代码，这样我就可以同时使用多个客户端了。我怎样才能应用线程？
TCP服务器
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
//#include <arpa/innet.h> // inet -> innet !Error!
#include <arpa/inet.h>
#include <sys/wait.h>
int main (void)
{
// Declare and define
int ls; // Listen socket descriptor (reference)
int s; // socket descriptor (reference)
char buffer [256]; // Data buffer
char* ptr = buffer; // Data buffer
int len = 0; // Number of bytes to send or receive
int maxLen = sizeof (buffer); // Maximum number of bytes to receive
int n = 0; // Number of bytes for each recv call
int waitSize = 16; // Size of waiting clients
struct sockaddr_in serverAddr; // Server address
struct sockaddr_in clientAddr; // Client address
//int clntAddrLen; // Length of client address
struct sockaddr_in servAddr; // !ADDED!
int SERV_PORT = 49999; // !ADDED!
// Create listen socketd
//if (ls = socket (PF_INET, SOCK_STREAM, 0) < 0);
ls = socket (AF_INET, SOCK_STREAM, 0);
if (ls < 0)
{
perror ("Error: Listen socket failed!");
exit (1);
}
// Create local (server) socket address
//memset (&servAddr, 0, sizeof (servAddr));
memset(&servAddr, '0', sizeof(servAddr));
servAddr.sin_family = AF_INET;
//servAddr.sin_addr.s_addr = htonl (INADDR_ANY); // Default IP address
servAddr.sin_addr.s_addr = INADDR_ANY; // Default IP address
servAddr.sin_port = htons (SERV_PORT); // Default port
memset( &( servAddr.sin_zero ), '\0', 8 );
// Bind listen socket to the local socket address
//if (bind (ls, &servAddr, sizeof (servAddr)) < 0);
if (bind (ls, ( struct sockaddr * ) &servAddr, sizeof (servAddr)) < 0)
{
perror ("Error: binding failed!");
exit (1);
}
// Listen to connection requests
//if (listen (ls, waitSize) < 0);
if (listen (ls, waitSize) < 0)
{
perror ("Error: listening failed!");
exit (1);
}
struct sockaddr_in clntAddr; // !ADD!
socklen_t clntAddrLen = sizeof(clntAddr); // !ADD!
//int clntAddrLen = sizeof(clntAddr); // !ADD!
// Handle the connection
for ( ; ; ) // Run forever
{
printf("for ( ; ; )\n");
// Accept connections from client
//if (s = accept (ls, &clntAddr, &clntAddrLen) < 0);
if ((s = accept (ls, (struct sockaddr *)&clntAddr, &clntAddrLen)) < 0)
{
//perror ("Error: accepting failed!);
perror ("Error: accepting failed!");
exit (1);
}
printf("accept\n");
// Data transfer section
if(( n = recv( s, buffer, sizeof( buffer ), 0 ) ) <= 0 )
{
perror("recv");
}
else
{
printf("Recv %d byte \n", n);
}
/*
while ((n = recv (s, ptr, maxLen, 0)) > 0)
{
//ptr + = n; // Move pointer along the buffer
ptr += n; // Move pointer along the buffer
//maxLen - = n; // Adjust maximum number of bytes to receive
maxLen -= n; // Adjust maximum number of bytes to receive
//len + = n; // Update number of bytes received
len += n; // Update number of bytes received
}
*/
int dataSend=0;
//dataSend = send (s, buffer, len, 0); // Send back (echo) all bytes received
dataSend = send (s, buffer, n, 0); // Send back (echo) all bytes received
if(dataSend==-1)
{
printf("dataSend==-1 \n");
perror("send");
}
else
{
printf("Send %d byte \n", dataSend);
}
// Close the socket
close (s);
} // End of for loop
} // End of echo server program
TCP客户端
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
//#include <arpa/innet.h> // inet -> innet !Error!
#include <arpa/inet.h>
#include <sys/wait.h>
int main (int argc, char* argv[ ]) // Three arguments to be checked later
{
// Declare and define
int s; // Socket descriptor
int n; // Number of bytes in each recv call
char* servName; // Server name
int servPort; // Server port number
char* string; // String to be echoed
int len; // Length of string to be echoed
char buffer [256 + 1]; // Buffer
char* ptr = buffer; // Pointer to move along the buffer
struct sockaddr_in serverAddr; // Server socket address
int maxLen = 256; // !ADD!
// Check and set arguments
//if (argc != 3)
if (argc != 4)
{
printf ("Error: three arguments are needed!");
exit (1);
}
//servName = arg[1]; // !Error!
servName = argv[1];
//servPort = atoi(arg [2]); // !Error!
servPort = atoi(argv[2]);
//string = arg [3]; // !Error!
string = argv[3];
struct sockaddr_in servAddr; // !ADD!
/*c
// Create socket
//if((s = socket (PF_INET, SOCK_STREAM, 0) < 0);
s = socket(AF_INET, SOCK_STREAM, 0);
if(s < 0)
{
perror ("Error: socket creation failed!");
exit (1);
}
bd/*
// Create remote (server) socket address
//memset (&servAddr, 0, sizeof(servAddr));
memset (&servAddr, '0', sizeof(servAddr));
serverAddr.sin_family = AF_INET;
inet_pton (AF_INET, servName, &serverAddr.sin_addr); // Server IP address
serverAddr.sin_port = htons (servPort); // Server port number
*/
// Create socket
if((s = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
printf("\n Error : Could not create socket \n");
return 1;
}
/**/
// Create remote (server) socket address
memset(&servAddr, '0', sizeof(servAddr));
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(servPort);
if(inet_pton(AF_INET, argv[1], &servAddr.sin_addr)<=0)
{
printf("\n inet_pton error occured\n");
return 1;
}
// Connect to the server
if( connect(s, (struct sockaddr *)&servAddr, sizeof(servAddr)) < 0)
{
perror ("Error: connection failed!");
exit (1);
}
// Connect to the server
//if (connect (sd, (struct sockaddr*)&servAddr, sizeof(servAddr)) < 0);
/* if (connect (s, (struct sockaddr*)&servAddr, sizeof(servAddr)) < 0)
{
perror ("Error: connection failed!");
exit (1);
}
*/
printf("connect\n");
int dataSend=0;
// Data transfer section
//send (s, string, strlen(string), 0);
dataSend = send (s, string, strlen(string), 0);
//dataSend = send (s, "123", 4, 0);
if(dataSend==-1)
{
printf("dataSend==-1 \n");
perror("send");
}
else
{
printf("else \n");
}
printf("while \n");
if(( n = recv( s, buffer, sizeof( buffer ), 0 ) ) <= 0 )
{
perror("recv");
}
else
{
printf("Recv %d byte \n", n);
}
/*
while ((n = recv (s, ptr, maxLen, 0)) > 0)
{
//ptr + = n; // Move pointer along the buffer
ptr += n; // Move pointer along the buffer
//maxLen - = n; // Adjust the maximum number of bytes
maxLen -= n; // Adjust the maximum number of bytes
len += n; // Update the length of string received
printf("while1 \n");
} // End of while loop
*/
// Print and verify the echoed string
//buffer [len] = Â’\0Â’;
buffer [n] = '\0';
printf ("Echoed string received: \n");
fputs (buffer, stdout);
printf ("\n");
// Close socket
close (s);
// Stop program
exit (0);
} // End of echo client program