'\" te .\" Copyright (c) 1992, X/Open Company Limited. All Rights Reserved. Portions Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved. .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at .\" http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html. .\" This notice shall appear on any product containing this material. .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License. .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License. .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH setsockopt 3XNET "21 Jan 2007" "SunOS 5.11" "X/Open Networking Services Library Functions" .SH NAME setsockopt \- set the socket options .SH SYNOPSIS .LP .nf \fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-lxnet\fR [ \fIlibrary\fR... ] #include \fBint\fR \fBsetsockopt\fR(\fBint\fR \fIsocket\fR, \fBint\fR \fIlevel\fR, \fBint\fR \fIoption_name\fR, \fBconst void*\fR\fIoption_value\fR, \fBsocklen_t\fR \fIoption_len\fR); .fi .SH DESCRIPTION .sp .LP The \fBsetsockopt()\fR function sets the option specified by the \fIoption_name\fR argument, at the protocol level specified by the \fIlevel\fR argument, to the value pointed to by the \fIoption_value\fR argument for the socket associated with the file descriptor specified by the \fIsocket\fR argument. .sp .LP The \fIlevel\fR argument specifies the protocol level at which the option resides. To set options at the socket level, specify the \fIlevel\fR argument as \fBSOL_SOCKET\fR. To set options at other levels, supply the appropriate protocol number for the protocol controlling the option. For example, to indicate that an option will be interpreted by the TCP (Transport Control Protocol), set \fIlevel\fR to the protocol number of TCP, as defined in the<\fBnetinet/in.h\fR> header, or as determined by using \fBgetprotobyname\fR(3XNET). .sp .LP The \fIoption_name\fR argument specifies a single option to set. The \fIoption_name\fR argument and any specified options are passed uninterpreted to the appropriate protocol module for interpretations. The <\fBsys/socket.h\fR> header defines the socket level options. The options are as follow .sp .ne 2 .mk .na \fB\fBSO_DEBUG\fR\fR .ad .RS 17n .rt Turns on recording of debugging information. This option enables or disables debugging in the underlying protocol modules. This option takes an \fBint\fR value. This is a boolean option. .RE .sp .ne 2 .mk .na \fB\fBSO_BROADCAST\fR\fR .ad .RS 17n .rt Permits sending of broadcast messages, if this is supported by the protocol. This option takes an \fBint\fR value. This is a boolean option. .RE .sp .ne 2 .mk .na \fB\fBSO_REUSEADDR\fR\fR .ad .RS 17n .rt Specifies that the rules used in validating addresses supplied to \fBbind\fR(3XNET) should allow reuse of local addresses, if this is supported by the protocol. This option takes an \fBint\fR value. This is a boolean option. .RE .sp .ne 2 .mk .na \fB\fBSO_KEEPALIVE\fR\fR .ad .RS 17n .rt Keeps connections active by enabling the periodic transmission of messages, if this is supported by the protocol. This option takes an \fBint\fR value. .sp If the connected socket fails to respond to these messages, the connection is broken and threads writing to that socket are notified with a \fBSIGPIPE\fR signal. .sp This is a boolean option. .RE .sp .ne 2 .mk .na \fB\fBSO_LINGER\fR\fR .ad .RS 17n .rt Lingers on a \fBclose\fR(2) if data is present. This option controls the action taken when unsent messages queue on a socket and \fBclose\fR(2) is performed. If \fBSO_LINGER\fR is set, the system blocks the process during \fBclose\fR(2) until it can transmit the data or until the time expires. If \fBSO_LINGER\fR is not specified, and \fBclose\fR(2) is issued, the system handles the call in a way that allows the process to continue as quickly as possible. This option takes a \fBlinger\fR structure, as defined in the <\fBsys/socket.h\fR> header, to specify the state of the option and linger interval. .RE .sp .ne 2 .mk .na \fB\fBSO_OOBINLINE\fR\fR .ad .RS 17n .rt Leaves received out-of-band data (data marked urgent) in line. This option takes an \fBint\fR value. This is a boolean option. .RE .sp .ne 2 .mk .na \fB\fBSO_SNDBUF\fR\fR .ad .RS 17n .rt Sets send buffer size. This option takes an \fBint\fR value. .RE .sp .ne 2 .mk .na \fB\fBSO_RCVBUF\fR\fR .ad .RS 17n .rt Sets receive buffer size. This option takes an \fBint\fR value. .RE .sp .ne 2 .mk .na \fB\fBSO_DONTROUTE\fR\fR .ad .RS 17n .rt Requests that outgoing messages bypass the standard routing facilities. The destination must be on a directly-connected network, and messages are directed to the appropriate network interface according to the destination address. The effect, if any, of this option depends on what protocol is in use. This option takes an \fBint\fR value. This is a boolean option. .RE .sp .ne 2 .mk .na \fB\fBSO_MAC_EXEMPT\fR\fR .ad .RS 17n .rt Sets the mandatory access control on the socket. A socket that has this option enabled can communicate with an unlabeled peer if the socket is in the global zone or has a label that dominates the default label of the peer. Otherwise, the socket must have a label that is equal to the default label of the unlabeled peer. \fBSO_MAC_EXEMPT\fR is a boolean option that is available only when the system is configured with Trusted Extensions. .RE .sp .ne 2 .mk .na \fB\fBSO_ALLZONES\fR\fR .ad .RS 17n .rt Bypasses zone boundaries (privileged). This option stores an \fBint\fR value. This is a boolean option. .sp The \fBSO_ALLZONES\fR option can be used to bypass zone boundaries between shared-IP zones. Normally, the system prevents a socket from being bound to an address that is not assigned to the current zone. It also prevents a socket that is bound to a wildcard address from receiving traffic for other zones. However, some daemons which run in the global zone might need to send and receive traffic using addresses that belong to other shared-IP zones. If set before a socket is bound, \fBSO_ALLZONES\fR causes the socket to ignore zone boundaries between shared-IP zones and permits the socket to be bound to any address assigned to the shared-IP zones. If the socket is bound to a wildcard address, it receives traffic intended for all shared-IP zones and behaves as if an equivalent socket were bound in each active shared-IP zone. Applications that use the \fBSO_ALLZONES\fR option to initiate connections or send datagram traffic should specify the source address for outbound traffic by binding to a specific address. There is no effect from setting this option in an exclusive-IP zone. Setting this option requires the \fBsys_net_config\fR privilege. See \fBzones\fR(5). .RE .sp .LP For boolean options, \fB0\fR indicates that the option is disabled and \fB1\fR indicates that the option is enabled. .sp .LP Options at other protocol levels vary in format and name. .SH USAGE .sp .LP The \fBsetsockopt()\fR function provides an application program with the means to control socket behavior. An application program can use \fBsetsockopt()\fR to allocate buffer space, control timeouts, or permit socket data broadcasts. The <\fBsys/socket.h\fR> header defines the socket-level options available to \fBsetsockopt()\fR. .sp .LP Options may exist at multiple protocol levels. The \fBSO_\fR options are always present at the uppermost socket level. .SH RETURN VALUES .sp .LP Upon successful completion, \fBsetsockopt()\fR returns \fB0\fR. Otherwise, \fB-1\fR is returned and \fBerrno\fR is set to indicate the error. .SH ERRORS .sp .LP The \fBsetsockopt()\fR function will fail if: .sp .ne 2 .mk .na \fB\fBEBADF\fR\fR .ad .RS 15n .rt The \fIsocket\fR argument is not a valid file descriptor. .RE .sp .ne 2 .mk .na \fB\fBEDOM\fR\fR .ad .RS 15n .rt The send and receive timeout values are too big to fit into the timeout fields in the socket structure. .RE .sp .ne 2 .mk .na \fB\fBEFAULT\fR\fR .ad .RS 15n .rt The \fIoption_value\fR parameter can not be accessed or written. .RE .sp .ne 2 .mk .na \fB\fBEINVAL\fR\fR .ad .RS 15n .rt The specified option is invalid at the specified socket level or the socket has been shut down. .RE .sp .ne 2 .mk .na \fB\fBEISCONN\fR\fR .ad .RS 15n .rt The socket is already connected, and a specified option can not be set while the socket is connected. .RE .sp .ne 2 .mk .na \fB\fBENOPROTOOPT\fR\fR .ad .RS 15n .rt The option is not supported by the protocol. .RE .sp .ne 2 .mk .na \fB\fBENOTSOCK\fR\fR .ad .RS 15n .rt The \fIsocket\fR argument does not refer to a socket. .RE .sp .LP The \fBsetsockopt()\fR function may fail if: .sp .ne 2 .mk .na \fB\fBENOMEM\fR\fR .ad .RS 11n .rt There was insufficient memory available for the operation to complete. .RE .sp .ne 2 .mk .na \fB\fBENOBUFS\fR\fR .ad .RS 11n .rt Insufficient resources are available in the system to complete the call. .RE .sp .ne 2 .mk .na \fB\fBENOSR\fR\fR .ad .RS 11n .rt There were insufficient STREAMS resources available for the operation to complete. .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPEATTRIBUTE VALUE _ Interface StabilityStandard _ MT-LevelMT-Safe .TE .SH SEE ALSO .sp .LP \fBbind\fR(3XNET), \fBendprotoent\fR(3XNET), \fBgetsockopt\fR(3XNET), \fBsocket\fR(3XNET), \fBattributes\fR(5), \fBstandards\fR(5)