gcc iamfool.c -lpthread
 : #include <pthread.h>
: #include "TCPEchoServer.h"	/* TCP echo server includes */
:  /* for POSIX threads */
:
:
:
: void *ThreadMain (void *arg);	/* Main program of a thread */
:
: /* Structure of arguments to pass to client thread */
: struct ThreadArgs
: {
: 	int clntSock;		/* Socket descriptor for client */
: };
:
: int
: main (int argc, char *argv<>)
: {
: 	int servSock;		/* Socket descriptor for server */
: 	int clntSock;		/* Socket descriptor for client */
: 	unsigned short echoServPort;	/* Server port */
: 	pthread_t threadID;	/* Thread ID from pthread_create() */
: 	struct ThreadArgs *threadArgs;	/* Pointer to argument structure for thread */
:
: 	if (argc != 2)		/* Test for correct number of arguments */
: 	{
: 		fprintf (stderr, "Usage: %s <SERVER PORT>", argv[0]);
: 		exit (1);
: 	}
:
: 	echoServPort = atoi (argv[1]);	/* First arg:  local port */
:
: 	servSock = CreateTCPServerSocket (echoServPort);
:
: 	for (;;)		/* run forever */
: 	{
: 		clntSock = AcceptTCPConnection (servSock);
:
: 		/* Create separate memory for client argument */
: 		if ((threadArgs =
: 		     (struct ThreadArgs *)
: 		     malloc (sizeof (struct ThreadArgs))) == NULL)
: 			DieWithError ("malloc() failed");
: 		threadArgs->clntSock = clntSock;
:
: 		/* Create client thread */
: 		if (pthread_create(&threadID, NULL, ThreadMain, (void *) threadArgs) != 0)
: 			DieWithError ("pthread_create() failed");
: 		printf ("with thread %ld", (long int) threadID);
: 	}
: 	/* NOT REACHED */
: }
:
: void *
: ThreadMain (void *threadArgs)
: {
: 	int clntSock;		/* Socket descriptor for client connection */
:
: 	/* Guarantees that thread resources are deallocated upon return */
: 	pthread_detach (pthread_self ());
:
: 	/* Extract socket file descriptor from argument */
: 	clntSock = ((struct ThreadArgs *) threadArgs)->clntSock;
: 	free (threadArgs);	/* Deallocate memory for argument */
:
: 	HandleTCPClient (clntSock);
:
: 	return (NULL);
: }
: 프로그램 루틴은 대충 이렇습니다.
: 안되는건 위에 보면 pthread_create와 pthread_detach함수를사용하는데
: 분명히 #include <pthread.h>를 명시해주었음에도 불구하고
: 컴파일과정에서
: undefine reference to 'pthread_create'
: undefine reference to 'pthread_detach'
: 가 뜹니다. 이게어떻게된영문인지..
:
: 이프로그램은 책에 있는 예제인데 echoserver로 요청이 오면 쓰레드를 생성하여
: 응답합니다 위에 AcceptTCPconnection()과 CreateTCPServerSocket()
: 과 HandleTCPclient()는 TCPEchoserver.h에서 불러들이는파일에
: 다 만들어져있으며 질문과는 관계가 없는걸로  생각되어 소스를 올리지 않았습니다. 답
: 이 아니라도좋습니다. 생각나시는것있으면 자그마한글이라도^^
: --
: ps:즐거운 하루되세요