04-12-2002
It would be better if we could see your code (excerpts) that
setup and do the message exchange. There are some operations
in which you must interleave reads and writes but if you wrote
some sort of socket (UNIX or INET) communications, this should
not be an issue. If you can't post code excerpts, try to give
as much detail about what you are doing and how you are doing
it. Maybe someone can help.
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socket(2) System Calls Manual socket(2)
NAME
socket - Creates an end point for communication and returns a descriptor
SYNOPSIS
#include <sys/socket.h>
int socket ( int domain, int type, int protocol );
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
socket(): XNS5.0
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Specifies the communications domain in which a socket is to be created. The domain argument specifies the address family with which
addresses specified in later socket operations should be interpreted. The sys/socket.h file contains the definitions of the address fami-
lies. Commonly used families are: UNIX pathnames Internet addresses (IPv4) [Tru64 UNIX] Internet addresses (IPv6) Specifies the seman-
tics of communication. The sys/socket.h file defines the socket types. The following types are supported: Provides sequenced, reliable,
two-way byte streams with a transmission mechanism for out-of-band data. Provides datagrams, which are connectionless messages of a fixed
maximum length. [Tru64 UNIX] Provides access to internal network protocols and interfaces. This type of socket is available only to a
process with superuser privilege. Specifies a particular protocol to be used with the socket. Specifying a protocol of 0 (zero) causes
the socket() function to default to the typical protocol for the requested type of returned socket.
DESCRIPTION
The socket() function creates a socket of the specified type in the specified domain.
The socket() function returns a descriptor (an integer) that can be used in later system calls that operate on sockets.
Socket level options control socket operations. The getsockopt() and setsockopt() functions are used to get and set these options, which
are defined in the sys/socket.h file.
RETURN VALUES
Upon successful completion, the socket() function returns a nonnegative integer (the socket descriptor). Otherwise, a value of -1 is
returned and errno is set to indicate the error.
ERRORS
If the socket() function fails, errno may be set to one of the following values: The process have not have appropriate privileges. The
addresses in the specified address family are not available in the kernel. The per-process descriptor table is full. No more file
descriptors are available for the system. Insufficient resources were available in the system to complete the call. The system was unable
to allocate kernel memory to increase the process descriptor table. The available STREAMS resources were insufficient for the operation to
complete. [Tru64 UNIX] The process is attempting to open a raw socket and does not have superuser privilege. The socket in the specified
address family is not supported. The socket type is not supported by the protocol.
RELATED INFORMATION
Functions: accept(2), bind(2), connect(2), listen(2), getsockname(2), getsockopt(2), recv(2), recvfrom(2), recvmsg(2), send(2), sendto(2),
sendmsg(2), setsockopt(2), shutdown(2), socketpair(2)
Standards: standards(5) delim off
socket(2)