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CentOS 7.0 - man page for socket (centos section 3P)

SOCKET(3P)			    POSIX Programmer's Manual			       SOCKET(3P)

PROLOG
       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME
       socket - create an endpoint for communication

SYNOPSIS
       #include <sys/socket.h>

       int socket(int domain, int type, int protocol);

DESCRIPTION
       The  socket()  function	shall  create  an  unbound socket in a communications domain, and
       return a file descriptor that can be used in later function calls that operate on sockets.

       The socket() function takes the following arguments:

       domain Specifies the communications domain in which a socket is to be created.

       type   Specifies the type of socket to be created.

       protocol
	      Specifies a particular protocol to be used with the socket. Specifying  a  protocol
	      of  0  causes  socket()  to use an unspecified default protocol appropriate for the
	      requested socket type.

       The domain argument specifies the address family used in the  communications  domain.  The
       address families supported by the system are implementation-defined.

       Symbolic  constants  that  can  be  used  for  the  domain  argument  are  defined  in the
       <sys/socket.h> header.

       The type argument specifies the socket type, which determines the semantics of  communica-
       tion  over the socket. The following socket types are defined; implementations may specify
       additional socket types:

       SOCK_STREAM
	      Provides sequenced, reliable, bidirectional, connection-mode byte streams, and  may
	      provide a transmission mechanism for out-of-band data.

       SOCK_DGRAM
	      Provides	datagrams,  which  are	connectionless-mode, unreliable messages of fixed
	      maximum length.

       SOCK_SEQPACKET
	      Provides sequenced, reliable, bidirectional, connection-mode transmission paths for
	      records.	A  record  can	be  sent using one or more output operations and received
	      using one or more input operations, but a single operation never transfers part  of
	      more than one record. Record boundaries are visible to the receiver via the MSG_EOR
	      flag.

       If the protocol argument is non-zero, it shall specify a protocol that is supported by the
       address	family.  If  the protocol argument is zero, the default protocol for this address
       family and type shall be used. The protocols supported by the system  are  implementation-
       defined.

       The  process  may  need	to have appropriate privileges to use the socket() function or to
       create some sockets.

RETURN VALUE
       Upon successful completion, socket() shall return a non-negative integer, the socket  file
       descriptor.  Otherwise,	a  value  of  -1  shall be returned and errno set to indicate the
       error.

ERRORS
       The socket() function shall fail if:

       EAFNOSUPPORT

	      The implementation does not support the specified address family.

       EMFILE No more file descriptors are available for this process.

       ENFILE No more file descriptors are available for the system.

       EPROTONOSUPPORT

	      The protocol is not supported by the address family, or the protocol  is	not  sup-
	      ported by the implementation.

       EPROTOTYPE
	      The socket type is not supported by the protocol.

       The socket() function may fail if:

       EACCES The process does not have appropriate privileges.

       ENOBUFS
	      Insufficient resources were available in the system to perform the operation.

       ENOMEM Insufficient memory was available to fulfill the request.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  documentation  for	specific  address families specifies which protocols each address
       family supports. The documentation for specific protocols  specifies  which  socket  types
       each protocol supports.

       The application can determine whether an address family is supported by trying to create a
       socket with domain set to the protocol in question.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       accept(), bind(), connect(), getsockname(), getsockopt(),  listen(),  recv(),  recvfrom(),
       recvmsg(), send(), sendmsg(), setsockopt(), shutdown(), socketpair(), the Base Definitions
       volume of IEEE Std 1003.1-2001, <netinet/in.h>, <sys/socket.h>

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       SOCKET(3P)


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