bzero

Bzero:Prototype: void bzero (void * s, int N );Function: set the first n Bytes of the byte string s to zero and include '\ 0 '.Note: bzero has no return value, and strings is used. h header file, strings. h was once part of the POSIX standard, but in the POSIX.1-2001 standard, these functions are marked as legacy functions and are not recommended.These functions are no longer in the POSIX.1-2008 standard. W

Simple FTP client#include #include #include #include #include #include #include #include #include #include typedef struct SOCKADDR* SOCKADDRP;Command transferint sockfd;Data transmissionint sockfd1;Char buf[4096] = {};AddressChar buf1[4096] = {};Account number, passwordChar buf2[4096] = {};Store command nameChar tem1[255] = {};Store file nameChar tem2[255] = {};struct sockaddr_in new_addr = {af_inet};void Func (){sprintf (buf, "pasv\n");Send (Sockfd,buf,strlen (BUF), 0);

Client: dl_client.c# Include "unp. H" Int main (INT argc, char * argv []){Char recvbuff [50], buff [50], * P;Int sockfd, Len, RET, test;Struct sockaddr_in serveraddr;File * FP;If (argc! = 3 ){Printf ("input:./client Return 0;}If (sockfd = socket (af_inet, sock_stream, 0) Printf ("socket error/N ");Return 0;}Bzero ( serveraddr, sizeof (serveraddr ));Serveraddr. sin_family = af_inet;Serveraddr. sin_port = htons (serv_port );If (inet_ton (af_inet, argv [

//////////////////////////////////// // Server code /////////////////////////////////// // This file is the server code # Include # Include For socket # Include # Include # Include Exit # Include # Include # DefineHello_world_server_port 7754# Define length_of_listen_queue 20# DefineBuffer_size 1024 Int main (INT argc, char ** argv){// Set a socket address structure server_addr, which represents the Internet address and port of the server.Struct sockaddr_inServer_addr;

check_passwd (char * client_passwd );Int getpasswd (char * p_file_name, char * server_passwd ); Int main (INT argc, char ** argv){Pid_t PID;PID = fork ();// For daemonIf (PID {Perror ("fork error ");Return 1;}Else if (pid> 0)Return 0;Else // daemo{Daemo ();}// Server ();} Void daemo (){Int I;Setsid ();/* frist */Chdir ("/");/* sencond */Umask (0);/* thrid */For (I = 0; I Close (I );Server ();/* Start the server program */} /* The server */Void server (){Int listenfd, connectfd;Struct sockaddr_i

compile under VC6.0 and MinGW5; it is said that the GCC support under Linux, but the author did not close test. In view of this, use memcpy () instead. For more information, see the differences between the C language bcopy () and memcpy (), bzero () and memset (), bcmp () and memcmp () functions The author defines a macro that is compiled and passed under VC6.0, with the following code: #include Execution results: Bcopy (): St

;Serv.sin_addr.s_addr=inaddr_any;Serv.sin_port=htons (port);if (Bind (FD, (struct sockaddr*) serv,sizeof (serv)) {printf ("Bind err\n");Exit (1);}Len=sizeof (Serfrom);while (1){N=recvfrom (Fd,buf,sizeof (BUF), 0, (struct sockaddr*) serfrom,len);if (n{printf ("recv err\n");Exit (1);}buf[n]= ' + ';printf ("%s\n", buf);if (strncmp (buf, "Bye", 3) ==0){Break}Else{printf ("input:\n");scanf ("%s", BUF1);strcat (BUF2,BUF1);SendTo (Fd,buf2,sizeof (BUF2), 0, (struct sockaddr*) serfrom,len);memset (buf2+1

service request, a new socket is generated. The SERver displays the IP address of the client and sends the string "hi, I am SERver!" to the client through the new socket! ". Close the socket. Main (){Int sock_fd, client_fd;/* sock_fd: * socket; client_fd: Data Transmission socket */Struct sockaddr_in ser_addr;/* local address information */Struct sockaddr_in cli_addr;/* client address information */Char msg [MAX_MSG_SIZE];/* buffer */Ser_sockfd =Socket(AF_INET, SOCK_STREAM, 0);/* Create the con

displays the IP address of the client and sends the string "Hi,i am server!" to the client through a new socket. Finally, close the socket. Main (){int sock_fd,client_fd; /*SOCK_FD: Monitor SOCKET;CLIENT_FD: Data transfer Socket */struct sockaddr_in ser_addr; /* Native Address information */struct sockaddr_in cli_addr; /* Client Address information */Char msg[max_msg_size];/* buffer */Ser_sockfd=socket (af_inet,sock_stream,0);/* Create a connected socket */if (ser_sockfd{/* Create

Server side: SERVER.C#include #include #include #include #include #include #include #include #include #include #include #include #define MAXBUF 1024int main (int argc, char **argv){int SOCKFD, NEW_FD;Socklen_t Len;struct sockaddr_in my_addr, their_addr;unsigned int myport, lisnum;Char buf[maxbuf + 1];Fd_set RfDs;struct Timeval TV;int retval, maxfd =-1;if (argv[2])MyPort = Atoi (argv[2]);/ * Converts a command-line string to an integer. For Port * /ElseMyPort = 8888;/ * Set the default port * /if

Example of UDP socket programming:The server-side code is as follows:? 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465 66676869 /************************************************************************* > File Name: server.c > Author: SongLee ************************************************************************/#include#include#include#include#include#include#include#include#include#include#include#defi

= socket (af_inet, sock_dgram, 0) {Perror ("socket ");Exit (1 );}Bzero ( ADDR, sizeof (ADDR ));ADDR. sin_family = af_inet;ADDR. sin_port = htons (port );ADDR. sin_addr.s_addr = htonl (inaddr_any );If (BIND (sockfd, (struct sockaddr *) ADDR, sizeof (ADDR) {Perror ("Connect ");Exit (1 );}Pthread_t ids1;Ret = pthread_create ( ids1, null, (void *) threads1, null );If (Ret! = 0){Printf ("cross-region slow drag \ n ");Exit (1 );} Pthread_t ids2;Ret = pt

HTTP header. Configuration File (config.txt ): PORT = 8000Directory =./peizhi HTML file (index_html ): First name: Last name: Server code: # Include # Include # Include # Include # Include # Include # Include # Include # Include # Define MAXLINE 80 Void deal_config (int * port_number, char * path ); Int ma

, sock_stream, 0)) = = = 1) {///IPV4if ((SOCKFD = socket (Pf_inet6, sock_stream, 0)) = = = 1) {//IPV6Perror ("socket");Exit (1);} elseprintf ("Socket created\n");Bzero (my_addr, sizeof (MY_ADDR));/* my_addr.sin_family = pf_inet; *///IPV4my_addr.sin6_family = Pf_inet6; IPv6/* My_addr.sin_port = htons (MyPort); *///IPV4My_addr.sin6_port = htons (MyPort); IPV6 htons: Converts the unsigned short shape number of a host into a network byte order.if (Argv[3]

The implementation of the server and the client chat with each other, no order restrictions, can be carried out at the same time. Service side: SERVER.C #include #include #include #include #include #include #include #include #include #include #define MAXBUF 1024int main (int argc, char *argv[]){int pid;int SOCKFD, NEW_FD;Socklen_t Len;struct sockaddr_in my_addr, their_addr;unsigned int myport, lisnum;Char buf[maxbuf + 1];if (argv[2])MyPort = Atoi (argv[2]); /* Converts command line string to In

the same length as the struct sockaddr, which can be set to zero with the bzero () or memset () function. Pointers to sockaddr_in and pointers to SOCKADDR can be converted to each other, which means that if a function requires a type of argument that is sockaddr, you can convert a pointer to a sockaddr_in to a pointer to a sockaddr when the function calls. , or vice versa.When using the BIND function, you can use the following assignment to automatic

and analysis of the test results are given in this paper. 3. Example The source code used for the first test is simple, as follows: 1 int 2 main (int argc, char *argv[]) 3 { 4 int i, n; 5 6 n = atoi (argv[1]); 7 Char arr[n+1]; 8 Bzero (arr, (n+1) * sizeof (char)); 9 for (i = 0; i arr = (char) (' A ' + i); 11} Arr[n] = '/0 '; printf ("%s/n", arr); 14 return (0); 16} The above program is named Dynarray.c, whose job is to add the value of the parameter

= sizeof (struct sockaddr_in );Bzero ( local_sin, sizeof (local_sin ));Local_sin.sin_family = af_inet;Local_sin.sin_addr.s_addr = inet_addr ("127.0.0.1 ");Local_sin.sin_port = htons (port );Bzero ( to_sin, sizeof (to_sin ));To_sin.sin_family = af_inet;To_sin.sin_addr.s_addr = inet_addr (to_ip );To_sin.sin_port = htons (to_port );Mysock = socket (af_inet, sock_dgram, 0); // create a socketInt bind_stats = B

sockaddr*) c_addr, len)) = =-1) {Perror ("accept");Exit (errno);}elseprintf ("\n***************** communication begins ***************\n");printf ("The client that is communicating with you is:%s:%d\n", Inet_ntoa (C_ADDR.SIN_ADDR), Ntohs (C_addr.sin_port));/****** Processing client Requests *******/Bzero (Buf,buflen);Len = recv (newfd,buf,buflen,0);if (Len >0 !strncmp (buf, "Time", 4)) {Bzero (Buf,buflen);

= "yuanqibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaibaihui ";Const cstring strnumber = const_str_bigamtnumber;Const cstring strotherunit = "integral corner "; String tobigmoney (double dmoney){Const double zerolowrange =-0.005; //-0.004449;Const double zerohighrange = 0.005; // 0.004449;If (zerolowrange Return const_str_zeroyuan; // "Zero RMB "; Bool negative = false;If (dmoney {Negative = true;Dmoney =-dmoney;} // There is no exception to the excess part here.