diff --git a/c/ServerNBTHR/ClientSideProc.c b/c/ServerNBTHR/ClientSideProc.c
new file mode 100644
index 0000000..8ae9448
--- /dev/null
+++ b/c/ServerNBTHR/ClientSideProc.c
@@ -0,0 +1,36 @@
+/*
+*                                  ClientSideProc.c
+*/
+
+#include <memory.h>		/* for memset */
+#include "square.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <rpc/pmap_clnt.h>
+#include <string.h>
+#include <memory.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+int main(int argc, char **argv)
+{
+	CLIENT *cl;
+	struct square_in in;
+	struct square_out out;
+	if (argc != 3) {
+		printf("Usage : client <hostname> <integer_valus=e>\n");
+		exit(1);
+	}
+	cl = clnt_create(argv[1], SQUARE_PROG, SQUARE_VERS, "tcp");
+	if (cl == NULL) {
+		clnt_perror(cl, "call failed");
+		exit(1);
+	}
+	in.arg1 = atol(argv[2]);
+	if (squareproc_2(&in, &out, cl) != RPC_SUCCESS) {
+		printf("%s\n", clnt_perror(cl, argv[1]));
+		exit(1);
+	}
+	printf("result: %ld\n", out.res1);
+	exit(0);
+}
diff --git a/c/ServerNBTHR/ServerNBTHR.c b/c/ServerNBTHR/ServerNBTHR.c
new file mode 100644
index 0000000..de6d02f
--- /dev/null
+++ b/c/ServerNBTHR/ServerNBTHR.c
@@ -0,0 +1,293 @@
+/*
+*  ServerNBTHR.c
+*/
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pthread.h>
+#define NUM_THREADS 512
+
+pthread_mutex_t request_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+void
+die(const char *func, int err)
+{
+        fprintf(stderr,"%s: %s\n",func, strerror(err));
+        abort();
+}
+
+void
+bark(const char *func, int err)
+{
+        fprintf(stderr,"%s: %s\n",func, strerror(err));
+}
+/*
+    Описание поцедуры ведущего потока , которая возвращает
+дескрипторов пассивного сокета, привязанного к адресу
+сервера.
+*/
+int
+getServerSocket(unsigned short int port)
+{
+        int listenSocket;
+        struct sockaddr_in listenSockaddr;
+
+        if((listenSocket=socket(PF_INET,SOCK_STREAM,0))<0)
+                die("socket()",errno);
+        memset(&listenSockaddr, 0, sizeof(listenSockaddr));
+        listenSockaddr.sin_family = PF_INET;
+        listenSockaddr.sin_port = htons(port);
+        listenSockaddr.sin_addr.s_addr = INADDR_ANY;
+
+         if(bind(listenSocket,(struct sockaddr*)&listenSockaddr,
+                                            sizeof(listenSockaddr)) < 0)
+                die("bind()",errno);
+
+        if(listen(listenSocket,5)<0)
+                die("listen()",errno);
+
+        return listenSocket;
+}
+
+/*
+    Описание процедуры выполняемой всеми ведомыми потоками
+*/
+
+
+void *
+serv_request(void *data)
+{
+struct connection_cb
+{
+        int dataSocket;
+        char data[256];
+        int dataSent;
+        int dataToSend;
+        int isReading;
+        struct connection_cb *next;
+};
+
+struct connection_cb *connections = NULL;
+
+int listenSocket = (int)data;
+	if(fcntl(listenSocket,F_SETFL,O_NONBLOCK)<0)
+		die("fcntl()",errno);
+
+	while(1)
+	{
+		fd_set readFdSet;
+		fd_set writeFdSet;
+		struct connection_cb *currentConn, **currentConnPtr, *tempConn;
+		int maxFdNum;
+
+		FD_ZERO(&readFdSet);
+		FD_ZERO(&writeFdSet);
+
+              /*
+                    Добавление дескриптора к множеству readFdSet
+              */
+		FD_SET(listenSocket,&readFdSet);
+		maxFdNum = listenSocket;
+
+           for(currentConn = connections;currentConn!=NULL;currentConn =
+                                                           currentConn->next)
+	{
+        	if(currentConn->isReading)
+	            	FD_SET(currentConn->dataSocket,&readFdSet);
+		else
+			FD_SET(currentConn->dataSocket,&writeFdSet);
+	maxFdNum = currentConn->dataSocket > maxFdNum ?currentConn-
+                                       >dataSocket : maxFdNum;
+	}
+          /*
+              Получение множества дескрипторов сокетов для обработки
+          */
+	if(select(maxFdNum+1,&readFdSet,&writeFdSet,NULL,NULL) < 0)
+	{
+		if(errno == EINTR)
+			continue;
+		die("select()",errno);
+	}
+
+	currentConnPtr=&connections;
+
+	while(*currentConnPtr!=NULL)
+	{
+
+          /*
+             Проверка принадлежности дескриптора
+             (*currentConnPtr)->dataSocket к множеству readFdSet
+           */
+
+	if((*currentConnPtr)->isReading &&
+                  FD_ISSET((*currentConnPtr)->dataSocket,&readFdSet))
+	{
+         int result = recv((*currentConnPtr)->dataSocket, (*currentConnPtr)->data,
+                                                         sizeof((*currentConnPtr)->data),0);
+
+	if(result < 0)
+	{
+	if(errno!=EINTR && errno!=EAGAIN && errno!=EWOULDBLOCK)
+	{
+		bark("recv()",errno);
+        	close((*currentConnPtr)->dataSocket);
+		tempConn = *currentConnPtr;
+        	*currentConnPtr = (*currentConnPtr)->next;
+		free(tempConn);
+		continue;
+	}
+		}
+	else
+         if(result==0)
+		{
+		close((*currentConnPtr)->dataSocket);
+        	tempConn = *currentConnPtr;
+		*currentConnPtr = (*currentConnPtr)->next;
+		free(tempConn);
+		continue;
+		}
+	else
+	{
+		(*currentConnPtr)->dataToSend = result;
+		(*currentConnPtr)->dataSent = 0;
+		(*currentConnPtr)->isReading = 0;
+         printf("Recieving  as Slave Thread id = '%d' \n",pthread_self());
+	}
+		}
+	else
+         /*
+             Проверка принадлежности дескриптора
+             (*currentConnPtr)->dataSocket к множеству writedFdSet
+         */
+         if(FD_ISSET((*currentConnPtr)->dataSocket,&writeFdSet))
+	{
+	int result = send((*currentConnPtr)->dataSocket,
+               (*currentConnPtr)->data+(*currentConnPtr)->dataSent,
+                (*currentConnPtr) ->dataToSend-(*currentConnPtr)->dataSent, 0);
+
+	if(result < 0)
+	{
+	  if(errno!=EINTR && errno!=EAGAIN)
+		{
+			bark("write()",errno);
+			close((*currentConnPtr)->dataSocket);
+			tempConn = *currentConnPtr;
+	        	*currentConnPtr = (*currentConnPtr)->next;
+			free(tempConn);
+			continue;
+		}
+			}
+        	else
+		{
+			(*currentConnPtr)->dataSent +=result;
+
+		if((*currentConnPtr)->dataSent >= (*currentConnPtr)->dataToSend)
+			(*currentConnPtr)->isReading = 1;
+				}
+			}
+
+			currentConnPtr = &((*currentConnPtr)->next);
+                printf("Sending as Slave Thread id = '%d' \n",pthread_self());
+		}
+           /*
+                Проверка принадлежности дескриптора listenSocket
+                к множеству readFdSet,т.е. необходимости обработать
+                вызов connect( )  от  нового клиента.
+           */
+       if(FD_ISSET(listenSocket,&readFdSet))
+		{
+
+  while(1)
+	{
+
+        /*
+            Вызовы pthread_mutex_lock, pthread_mutex_unlock
+            Не нужны в среде Linux
+         */
+        pthread_mutex_lock(&request_mutex);
+	    int result = accept(listenSocket,(struct sockaddr*)NULL,NULL);
+        pthread_mutex_unlock(&request_mutex);
+	if(result < 0)
+	{
+        	if(errno==EAGAIN || errno == EWOULDBLOCK)
+			break;
+		        die("accept()",errno);
+			}
+	else
+	{
+		*currentConnPtr = malloc(sizeof(struct connection_cb));
+		if(*currentConnPtr==NULL)
+		die("malloc()",0);
+
+         	if(fcntl(result,F_SETFL,O_NONBLOCK)<0)
+	        	die("fcntl()",errno);
+
+		(*currentConnPtr)->dataSocket = result;
+                    (*currentConnPtr)->isReading = 1;
+		(*currentConnPtr)->next = 0;
+	        currentConnPtr = &((*currentConnPtr)->next);
+       printf("Accepting  as Master Thread id = '%d' \n",pthread_self());
+		        	}
+			}
+		}
+	}
+}
+int
+main(int argc,char *argv[])
+{
+int k;
+int descSock;
+char *service="1500";
+switch(argc) {
+case 1:
+ break;
+case 2:
+ service = argv[1];
+ break;
+default:
+ printf ("Usage: ./ServerBNTH [port]\n");
+ exit(1);
+}
+
+size_t stacksize;
+pthread_t p_thread[NUM_THREADS];
+
+/*
+ Установка размера стека для ведомых потоков
+*/
+
+pthread_attr_t attr;
+   pthread_attr_init(&attr);
+   stacksize = 500000;
+   pthread_attr_setstacksize (&attr, stacksize);
+   pthread_attr_getstacksize (&attr, &stacksize);
+
+/*
+  Получение значения дескриптора пассивного сокета
+*/
+
+   descSock  = getServerSocket(atoi(service));
+
+/*
+ Запуск ведомых потоков
+*/
+
+for(k=0; k<NUM_THREADS; k++) {
+  pthread_create(&p_thread[k],&attr,serv_request,(void*)descSock);
+  printf("Thread %d started \n",k);
+}
+
+pthread_attr_destroy(&attr);
+
+for(k=0;k<NUM_THREADS;k++) {
+  pthread_join(p_thread[k], NULL);
+  printf("Completed join with thread %d\n",k);
+ }
+}
diff --git a/c/ServerNBTHR/ServerSideProc.c b/c/ServerNBTHR/ServerSideProc.c
new file mode 100644
index 0000000..884c634
--- /dev/null
+++ b/c/ServerNBTHR/ServerSideProc.c
@@ -0,0 +1,30 @@
+ /*
+                       ServerSideProc.c
+ */
+ #include "square.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <rpc/pmap_clnt.h>
+#include <string.h>
+#include <memory.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+int request=0;
+
+bool_t squareproc_2_svc(square_in *inp,square_out *outp,struct svc_req *rqstp)
+{
+    printf("Thread id = '%ld' started, arg = %d\n",pthread_self(),inp->arg1);
+    /*
+       Имитация работы процедуры , выполняемой потоками сервера
+    */
+    sleep(5);
+    outp->res1=inp->arg1*inp->arg1;
+    printf("Thread id = '%ld' is done %d \n",pthread_self(),outp->res1);
+    return(TRUE);
+}
+int square_prog_2_freeresult(SVCXPRT *transp,xdrproc_t xdr_result, caddr_t result)
+{
+    xdr_free(xdr_result,result);
+    return(1);
+}
diff --git a/c/ServerNBTHR/run.sh b/c/ServerNBTHR/run.sh
new file mode 100755
index 0000000..21ab9d2
--- /dev/null
+++ b/c/ServerNBTHR/run.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+rpcgen -a -M square.x
+
+gcc -o ServerSQUARE  ServerSideProc.c  square_svc.c square_xdr.c -lpthread -lnsl
+
+gcc -o  ClientSQUARE  ClientSideProc.c  square_clnt.c  square_xdr.c -lprthread -lnsl
diff --git a/c/ServerNBTHR/square.h b/c/ServerNBTHR/square.h
new file mode 100644
index 0000000..794e35d
--- /dev/null
+++ b/c/ServerNBTHR/square.h
@@ -0,0 +1,11 @@
+struct square_in {
+ long arg1;
+};
+struct square_out {
+ long res1;
+};
+program SQUARE_PROG {
+  version SQUARE_VERS {
+  square_out SQUAREPROC(square_in) = 1;
+  } = 2 ;
+} = 0x31230000;
diff --git a/c/ServerNBTHR/square_client.c b/c/ServerNBTHR/square_client.c
new file mode 100644
index 0000000..dcf8ef9
--- /dev/null
+++ b/c/ServerNBTHR/square_client.c
@@ -0,0 +1,48 @@
+/*
+ * This is sample code generated by rpcgen.
+ * These are only templates and you can use them
+ * as a guideline for developing your own functions.
+ */
+
+#include "square.h"
+
+
+void
+square_prog_2(char *host)
+{
+	CLIENT *clnt;
+	enum clnt_stat retval_1;
+	square_out result_1;
+	square_in  squareproc_2_arg;
+
+#ifndef	DEBUG
+	clnt = clnt_create (host, SQUARE_PROG, SQUARE_VERS, "udp");
+	if (clnt == NULL) {
+		clnt_pcreateerror (host);
+		exit (1);
+	}
+#endif	/* DEBUG */
+
+	retval_1 = squareproc_2(&squareproc_2_arg, &result_1, clnt);
+	if (retval_1 != RPC_SUCCESS) {
+		clnt_perror (clnt, "call failed");
+	}
+#ifndef	DEBUG
+	clnt_destroy (clnt);
+#endif	 /* DEBUG */
+}
+
+
+int
+main (int argc, char *argv[])
+{
+	char *host;
+
+	if (argc < 2) {
+		printf ("usage: %s server_host\n", argv[0]);
+		exit (1);
+	}
+	host = argv[1];
+	square_prog_2 (host);
+exit (0);
+}
diff --git a/c/ServerNBTHR/square_server.c b/c/ServerNBTHR/square_server.c
new file mode 100644
index 0000000..a618f20
--- /dev/null
+++ b/c/ServerNBTHR/square_server.c
@@ -0,0 +1,31 @@
+/*
+ * This is sample code generated by rpcgen.
+ * These are only templates and you can use them
+ * as a guideline for developing your own functions.
+ */
+
+#include "square.h"
+
+bool_t
+squareproc_2_svc(square_in *argp, square_out *result, struct svc_req *rqstp)
+{
+	bool_t retval;
+
+	/*
+	 * insert server code here
+	 */
+
+	return retval;
+}
+
+int
+square_prog_2_freeresult (SVCXPRT *transp, xdrproc_t xdr_result, caddr_t result)
+{
+	xdr_free (xdr_result, result);
+
+	/*
+	 * Insert additional freeing code here, if needed
+	 */
+
+	return 1;
+}
diff --git a/c/ServerNBTHR/square_svc.c b/c/ServerNBTHR/square_svc.c
new file mode 100644
index 0000000..a6e1b17
--- /dev/null
+++ b/c/ServerNBTHR/square_svc.c
@@ -0,0 +1,166 @@
+/*                                                          square_svc.c
+ * Please do not edit this file.
+ * It was generated using rpcgen.
+ */
+
+#include "square.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <rpc/pmap_clnt.h>
+#include <string.h>
+#include <memory.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#ifndef SIG_PF
+#define SIG_PF void(*)(int)
+#endif
+
+pthread_t p_thread;
+pthread_attr_t attr;
+
+/*
+
+ Процедура выполняемая потоком
+
+ */
+
+void *
+serv_request(void *data)
+{
+struct thr_data
+{
+struct svc_req *rqstp;
+SVCXPRT *transp;
+} *ptr_data;
+
+{
+
+   union {
+                square_in squareproc_2_arg;
+   } argument;
+   union {
+                square_out squareproc_2_res;
+   } result;
+   bool_t retval;
+   xdrproc_t _xdr_argument, _xdr_result;
+   bool_t (*local)(char *, void *, struct svc_req *);
+
+/*
+
+  Распаковка данных , переданных в процедуру при запуске потока.
+
+*/
+
+ptr_data = (struct thr_data  *)data;
+struct svc_req *rqstp = ptr_data->rqstp;
+register SVCXPRT *transp = ptr_data->transp;
+
+
+        switch (rqstp->rq_proc) {
+        case NULLPROC:
+                (void) svc_sendreply (transp, (xdrproc_t) xdr_void, (char *)NULL);
+                return;
+
+        case SQUAREPROC:
+                _xdr_argument = (xdrproc_t) xdr_square_in;
+                _xdr_result = (xdrproc_t) xdr_square_out;
+                local = (bool_t (*) (char *, void *,  struct svc_req *))squareproc_2_svc;
+                break;
+
+        default:
+                svcerr_noproc (transp);
+                return;
+        }
+        memset ((char *)&argument, 0, sizeof (argument));
+        if (!svc_getargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
+                svcerr_decode (transp);
+                return;
+        }
+
+  /*
+
+     Стандартный  вызов функции сервера.
+     Данные для вызова уже приведены к стандарту.
+
+  */
+
+        retval = (bool_t) (*local)((char *)&argument, (void *)&result, rqstp);
+
+ if (retval > 0 && !svc_sendreply(transp, (xdrproc_t) _xdr_result, (char *)&result))
+   {
+                svcerr_systemerr (transp);
+       }
+        if (!svc_freeargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
+                fprintf (stderr, "%s", "unable to free arguments");
+                exit (1);
+        }
+        if (!square_prog_2_freeresult (transp, _xdr_result, (caddr_t) &result))
+                fprintf (stderr, "%s", "unable to free results");
+        return;
+}
+}
+
+/*
+
+Принципиально измененный код square_prog_2 , стартующей теперь
+новый поток для каждого инициированного клиентом вызова
+процедуры на удаленном сервере
+
+*/
+
+static void
+square_prog_2(struct svc_req *rqstp, register SVCXPRT *transp)
+{
+struct data_str
+{
+struct svc_req *rqstp;
+SVCXPRT *transp;
+} *data_ptr =(struct data_str*)malloc(sizeof(struct data_str);
+
+{
+
+/*
+  Упаковка данных в структуру для передачи ссылки на нее,
+   как параметра запускаемому потоку
+*/
+
+data_ptr->rqstp = rqstp;
+data_ptr->transp = transp;
+pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
+pthread_create(&p_thread,&attr,serv_request,(void *)data_ptr);
+ }
+}
+
+int
+main (int argc, char **argv)
+{
+	register SVCXPRT *transp;
+
+	pmap_unset (SQUARE_PROG, SQUARE_VERS);
+
+	transp = svcudp_create(RPC_ANYSOCK);
+	if (transp == NULL) {
+		fprintf (stderr, "%s", "cannot create udp service.");
+		exit(1);
+	}
+	if (!svc_register(transp, SQUARE_PROG, SQUARE_VERS, square_prog_2, IPPROTO_UDP)) {
+		fprintf (stderr, "%s", "unable to register (SQUARE_PROG, SQUARE_VERS, udp).");
+		exit(1);
+	}
+
+	transp = svctcp_create(RPC_ANYSOCK, 0, 0);
+	if (transp == NULL) {
+		fprintf (stderr, "%s", "cannot create tcp service.");
+		exit(1);
+	}
+	if (!svc_register(transp, SQUARE_PROG, SQUARE_VERS, square_prog_2, IPPROTO_TCP)) {
+		fprintf (stderr, "%s", "unable to register (SQUARE_PROG, SQUARE_VERS, tcp).");
+		exit(1);
+	}
+
+	svc_run ();
+	fprintf (stderr, "%s", "svc_run returned");
+	exit (1);
+	/* NOTREACHED */
+}
diff --git a/c/sockets/echo-client.c b/c/echo_server/echo-client.c
similarity index 100%
rename from c/sockets/echo-client.c
rename to c/echo_server/echo-client.c
diff --git a/c/sockets/echo-server.c b/c/echo_server/echo-server.c
similarity index 100%
rename from c/sockets/echo-server.c
rename to c/echo_server/echo-server.c
diff --git a/c/sockets/int2ip.c b/c/echo_server/int2ip.c
similarity index 100%
rename from c/sockets/int2ip.c
rename to c/echo_server/int2ip.c
diff --git a/c/sockets/ip2int.c b/c/echo_server/ip2int.c
similarity index 100%
rename from c/sockets/ip2int.c
rename to c/echo_server/ip2int.c
diff --git a/c/sockets/sock1.c b/c/echo_server/sock1.c
similarity index 100%
rename from c/sockets/sock1.c
rename to c/echo_server/sock1.c
diff --git a/c/sockets/tmp1.c b/c/echo_server/tmp1.c
similarity index 100%
rename from c/sockets/tmp1.c
rename to c/echo_server/tmp1.c
diff --git a/c/masync_server/echo-client.c b/c/masync_server/echo-client.c
new file mode 100644
index 0000000..5093ce6
--- /dev/null
+++ b/c/masync_server/echo-client.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+unsigned int ip2int(const char * s) {
+	int ip[4];
+	sscanf(s,"%d.%d.%d.%d",ip,ip+1,ip+2,ip+3);
+	return ip[0]<<24|ip[1]<<16|ip[2]<<8|ip[3];
+}
+
+int sendall(int s, char *buf, int len, int flags)
+{
+    int total = 0;
+    int n;
+
+    while(total < len)
+    {
+        n = send(s, buf+total, len-total, flags);
+        if(n == -1) { break; }
+        total += n;
+    }
+
+    return (n==-1 ? -1 : total);
+}
+
+char message[] = "Hello there!\n";
+char buf[sizeof(message)];
+
+int main()
+{
+    int sock;
+    struct sockaddr_in addr;
+
+    sock = socket(AF_INET, SOCK_STREAM, 0);
+    if(sock < 0)
+    {
+        perror("socket");
+        exit(1);
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(3425); // или любой другой порт...
+    addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);	// (ip2int("192.168.2.1"));
+    if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
+    {
+        perror("connect");
+        exit(2);
+    }
+
+    send(sock, message, sizeof(message), 0);
+    recv(sock, buf, sizeof(message), 0);
+
+    printf("%s\n",buf);
+    close(sock);
+
+    return 0;
+}
diff --git a/c/masync_server/echo-server.c b/c/masync_server/echo-server.c
new file mode 100644
index 0000000..d68930b
--- /dev/null
+++ b/c/masync_server/echo-server.c
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+static const char * int2ip(unsigned int ip) {
+	static char s[16];
+	sprintf(s,"%d.%d.%d.%d",ip>>24,ip<<8>>24,ip<<16>>24,ip<<24>>24);
+	return s;
+}
+
+int main()
+{
+    int sock, listener;
+    struct sockaddr_in addr;
+    char buf[1024];
+    int bytes_read;
+
+    listener = socket(AF_INET, SOCK_STREAM, 0);
+    if(listener < 0)
+    {
+        perror("socket");
+        exit(1);
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(3425);
+    addr.sin_addr.s_addr = htonl(INADDR_ANY);
+    if(bind(listener, (struct sockaddr *)&addr, sizeof(addr)) < 0)
+    {
+        perror("bind");
+        exit(2);
+    }
+
+    listen(listener, 1);
+	//~ printf("%X\n",addr.sin_addr.s_addr);
+    while(1)
+    {
+		socklen_t n = sizeof(struct sockaddr);
+		sock = accept(listener, (struct sockaddr *)&addr, &n);
+		printf("incoming request from %s\n",int2ip(ntohl(addr.sin_addr.s_addr)));
+		//~ printf("%X\n",addr.sin_addr.s_addr);
+        if(sock < 0)
+        {
+            perror("accept");
+            exit(3);
+        }
+
+        while(1)
+        {
+            bytes_read = recv(sock, buf, 1024, 0);
+            if(bytes_read <= 0) break;
+            send(sock, buf, bytes_read, 0);
+            printf("%s", buf);
+        }
+
+        close(sock);
+    }
+
+    return 0;
+}
diff --git a/c/masync_server/int2ip.c b/c/masync_server/int2ip.c
new file mode 100644
index 0000000..eccdb22
--- /dev/null
+++ b/c/masync_server/int2ip.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <netdb.h>
+
+static const char * int2ip(unsigned int ip) {
+	static char s[16];
+	sprintf(s,"%d.%d.%d.%d",ip>>24,ip<<8>>24,ip<<16>>24,ip<<24>>24);
+	return s;
+}
+
+int main(int argc, char * argv[]) {
+	if(argc < 2) {
+		perror("need hex ip address");
+		exit(1);
+	}
+
+	unsigned int ip = 0;
+	sscanf(argv[1],"%X",&ip);
+
+	printf("%s\n",int2ip(ip));
+
+	return 0;
+}
diff --git a/c/masync_server/ip2int.c b/c/masync_server/ip2int.c
new file mode 100644
index 0000000..7b44472
--- /dev/null
+++ b/c/masync_server/ip2int.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <netdb.h>
+
+unsigned int ip2int(const char * s) {
+	int ip[4];
+	sscanf(s,"%d.%d.%d.%d",ip,ip+1,ip+2,ip+3);
+	return ip[0]<<24|ip[1]<<16|ip[2]<<8|ip[3];
+}
+
+int main(int argc, char * argv[]) {
+	if(argc < 2) {
+		perror("need ip address string");
+		exit(1);
+	}
+
+	printf("%X\n",ip2int(argv[1]));
+
+	return 0;
+}
diff --git a/c/masync_server/sock1.c b/c/masync_server/sock1.c
new file mode 100644
index 0000000..27c255c
--- /dev/null
+++ b/c/masync_server/sock1.c
@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+//~ domain = AF_UNIX, AF_INET, AF_INET6, AF_IPX
+//~ type = SOCK_STREAM, SOCK_DGRAM, SOCK_RAW
+//~ int socket(int domain, int type, int protocol);
+
+//~ struct sockaddr {
+    //~ unsigned short    sa_family;    // Семейство адресов, AF_xxx
+    //~ char              sa_data[14];  // 14 байтов для хранения адреса
+//~ };
+//~ struct sockaddr_in {
+    //~ short int          sin_family;  // Семейство адресов
+    //~ unsigned short int sin_port;    // Номер порта
+    //~ struct in_addr     sin_addr;    // IP-адрес
+    //~ unsigned char      sin_zero[8]; // "Дополнение" до размера структуры sockaddr
+//~ };
+//~ struct in_addr {
+    //~ unsigned long s_addr;
+//~ };
+//~ htons, htonl, ntohs, ntohl
+//~ int bind(int sockfd, struct sockaddr *addr, int addrlen);
+
+//~ int listen(int sockfd, int backlog);
+//~ int accept(int sockfd, void *addr, int *addrlen);
+
+// клиент
+//~ int connect(int sockfd, struct sockaddr *serv_addr, int addrlen);
+
+//~ int send(int sockfd, const void *msg, int len, int flags);
+
+// отправка буфера целиком
+//~ int sendall(int s, char *buf, int len, int flags)
+//~ {
+    //~ int total = 0;
+    //~ int n;
+//~
+    //~ while(total < len)
+    //~ {
+        //~ n = send(s, buf+total, len-total, flags);
+        //~ if(n == -1) { break; }
+        //~ total += n;
+    //~ }
+//~
+    //~ return (n==-1 ? -1 : total);
+//~ }
+
+//~ int recv(int sockfd, void *buf, int len, int flags);
+
+// закрытие соединения
+//~ int close(int fd);
+
+// запрет передачи 0 - чтения, 1 - записи, 2 - и того, и др.
+//~ int shutdown(int sockfd, int how);
+
+
+int main(int argc, char * argv[])
+{
+	struct a
+	{
+		char aaa[256];
+	};
+
+	printf("%lu\n", sizeof(struct a));
+	return 0;
+}
diff --git a/c/masync_server/tmp1.c b/c/masync_server/tmp1.c
new file mode 100644
index 0000000..e41de65
--- /dev/null
+++ b/c/masync_server/tmp1.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+void f()
+{
+	int c = 0;
+	printf("c=%lu\n",(unsigned long)&c);
+}
+
+
+int main(int argc, char * argv[]) {
+	//~ printf("%lu\n", sizeof(long));
+
+	int a = 0;
+
+	int pid = fork();
+	printf("pid=%d\n",pid);
+	printf("a=%lu\n",(unsigned long)&a);
+
+	int b = 0;
+	printf("b=%lu\n",(unsigned long)&b);
+
+	f();
+
+	return 0;
+}