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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 &#039;pthread_create&#039; : undefine reference to &#039;pthread_detach&#039; : 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. 답이 아니라도좋습니다. 생각나시는것있으면 자그마한글이라도^^ : : -- : ps:즐거운 하루되세요

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