c语言sys socket.h,c常用头文件——sys/socket.h

比眉伴天荒 2022-10-14 15:52 271阅读 0赞

/\* Create a new socket of type TYPE in domain DOMAIN, using

protocol PROTOCOL. If PROTOCOL is zero, one is chosen automatically.

Returns a file descriptor for the new socket, or -1 for errors. \*/

extern int socket (int \_\_domain, int \_\_type, int \_\_protocol) \_\_THROW;

\_domain常见的两个取值

\#define PF\_UNIX PF\_LOCAL /\* POSIX name for PF\_LOCAL. \*/

\#define PF\_INET 2 /\* IP protocol family. \*/

\_type常见取值为：

SOCK\_STREAM

SOCK\_DGRAM

eg:

int listenfd;

listenfd = socket(PF\_INET, SOCK\_STREAM, 0);

======================================================================

/\* Put the current value for socket FD's option OPTNAME at protocol level LEVEL

into OPTVAL (which is \*OPTLEN bytes long), and set \*OPTLEN to the value's

actual length. Returns 0 on success, -1 for errors. \*/

extern int getsockopt (int \_\_fd, int \_\_level, int \_\_optname,

void \*\_\_restrict \_\_optval,

socklen\_t \*\_\_restrict \_\_optlen) \_\_THROW;

======================================================================

/\* Set socket FD's option OPTNAME at protocol level LEVEL

to \*OPTVAL (which is OPTLEN bytes long).

Returns 0 on success, -1 for errors. \*/

extern int setsockopt (int \_\_fd, int \_\_level, int \_\_optname,

\_\_const void \*\_\_optval, socklen\_t \_\_optlen) \_\_THROW;

eg：

int listenfd;        //listenfd is a socket fd

int reuse\_addr = 1;

setsockopt(listenfd,SOL\_SOCKET,SO\_REUSEADDR,&reuse\_addr,sizeof(int));

======================================================================

/\* Give the socket FD the local address ADDR (which is LEN bytes long). \*/

extern int bind (int \_\_fd, \_\_CONST\_SOCKADDR\_ARG \_\_addr, socklen\_t \_\_len)

\_\_THROW;

eg:

int listenfd;

struct sockaddr\_in serveraddr;

bind(listenfd,(struct sockaddr\*)&serveraddr,sizeof(serveraddr));

======================================================================

/\* Prepare to accept connections on socket FD.

N connection requests will be queued before further requests are refused.

Returns 0 on success, -1 for errors. \*/

extern int listen (int \_\_fd, int \_\_n) \_\_THROW;

eg:

\#define LISTENQ 20

int listenfd;

listen(listenfd,LISTENQ);

======================================================================

/\* Await a connection on socket FD.

When a connection arrives, open a new socket to communicate with it,

set \*ADDR (which is \*ADDR\_LEN bytes long) to the address of the connecting

peer and \*ADDR\_LEN to the address's actual length, and return the

new socket's descriptor, or -1 for errors.

This function is a cancellation point and therefore not marked with

\_\_THROW. \*/

extern int accept (int \_\_fd, \_\_SOCKADDR\_ARG \_\_addr,

socklen\_t \*\_\_restrict \_\_addr\_len);

eg:

int listenfd;

int connfd;

struct sockaddr\_in clientaddr;

size\_t clientaddr\_len;

clientaddr\_len=sizeof(clientaddr);

connfd = accept(listenfd,(struct sockaddr\*)&clientaddr,&clientaddr\_len);

if(connfd < 0)\{

perror("accept");

======================================================================

/\* Open a connection on socket FD to peer at ADDR (which LEN bytes long).

For connectionless socket types, just set the default address to send to

and the only address from which to accept transmissions.

Return 0 on success, -1 for errors.

This function is a cancellation point and therefore not marked with

\_\_THROW. \*/

extern int connect (int \_\_fd, \_\_CONST\_SOCKADDR\_ARG \_\_addr, socklen\_t \_\_len);

======================================================================

/\* Send N bytes of BUF to socket FD. Returns the number sent or -1.

This function is a cancellation point and therefore not marked with

\_\_THROW. \*/

extern ssize\_t send (int \_\_fd, \_\_const void \*\_\_buf, size\_t \_\_n, int \_\_flags);

======================================================================

/\* Read N bytes into BUF from socket FD.

Returns the number read or -1 for errors.

This function is a cancellation point and therefore not marked with

\_\_THROW. \*/

extern ssize\_t recv (int \_\_fd, void \*\_\_buf, size\_t \_\_n, int \_\_flags);

c语言sys socket.h,c常用头文件——sys/socket.h

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