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NAME="NET-COMMON-TCPIP-MANPAGES-GETSOCKOPT">getsockopt</H1
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>GETSOCKOPT(2) System Calls Manual GETSOCKOPT(2)
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>GETSOCKOPT(2) System Calls Manual GETSOCKOPT(2)
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NAME
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NAME
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getsockopt, setsockopt - get and set options on sockets
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getsockopt, setsockopt - get and set options on sockets
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|
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SYNOPSIS
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SYNOPSIS
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/socket.h>
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|
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int
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int
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getsockopt(int s, int level, int optname, void *optval,
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getsockopt(int s, int level, int optname, void *optval,
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socklen_t *optlen);
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socklen_t *optlen);
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int
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int
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setsockopt(int s, int level, int optname, const void *optval,
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setsockopt(int s, int level, int optname, const void *optval,
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socklen_t optlen);
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socklen_t optlen);
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DESCRIPTION
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DESCRIPTION
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getsockopt() and setsockopt() manipulate the options associated with a
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getsockopt() and setsockopt() manipulate the options associated with a
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socket. Options may exist at multiple protocol levels; they are always
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socket. Options may exist at multiple protocol levels; they are always
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present at the uppermost ``socket'' level.
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present at the uppermost ``socket'' level.
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|
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When manipulating socket options the level at which the option resides
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When manipulating socket options the level at which the option resides
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and the name of the option must be specified. To manipulate options at
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and the name of the option must be specified. To manipulate options at
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the socket level, level is specified as SOL_SOCKET. To manipulate
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the socket level, level is specified as SOL_SOCKET. To manipulate
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options at any other level the protocol number of the appropriate proto-
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options at any other level the protocol number of the appropriate proto-
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col controlling the option is supplied. For example, to indicate that an
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col controlling the option is supplied. For example, to indicate that an
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option is to be interpreted by the TCP protocol, level should be set to
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option is to be interpreted by the TCP protocol, level should be set to
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the protocol number of TCP; see getprotoent(3).
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the protocol number of TCP; see getprotoent(3).
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|
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The parameters optval and optlen are used to access option values for
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The parameters optval and optlen are used to access option values for
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setsockopt(). For getsockopt() they identify a buffer in which the value
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setsockopt(). For getsockopt() they identify a buffer in which the value
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for the requested option(s) are to be returned. For getsockopt(), optlen
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for the requested option(s) are to be returned. For getsockopt(), optlen
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is a value-result parameter, initially containing the size of the buffer
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is a value-result parameter, initially containing the size of the buffer
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pointed to by optval, and modified on return to indicate the actual size
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pointed to by optval, and modified on return to indicate the actual size
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of the value returned. If no option value is to be supplied or returned,
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of the value returned. If no option value is to be supplied or returned,
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optval may be NULL.
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optval may be NULL.
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optname and any specified options are passed uninterpreted to the appro-
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optname and any specified options are passed uninterpreted to the appro-
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priate protocol module for interpretation. The include file
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priate protocol module for interpretation. The include file
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<sys/socket.h> contains definitions for socket level options, described
|
<sys/socket.h> contains definitions for socket level options, described
|
below. Options at other protocol levels vary in format and name; consult
|
below. Options at other protocol levels vary in format and name; consult
|
the appropriate entries in section 4 of the manual.
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the appropriate entries in section 4 of the manual.
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|
|
Most socket-level options utilize an int parameter for optval. For
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Most socket-level options utilize an int parameter for optval. For
|
setsockopt(), the parameter should be non-zero to enable a boolean
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setsockopt(), the parameter should be non-zero to enable a boolean
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option, or zero if the option is to be disabled. SO_LINGER uses a struct
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option, or zero if the option is to be disabled. SO_LINGER uses a struct
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linger parameter, defined in <sys/socket.h>, which specifies the desired
|
linger parameter, defined in <sys/socket.h>, which specifies the desired
|
state of the option and the linger interval (see below). SO_SNDTIMEO and
|
state of the option and the linger interval (see below). SO_SNDTIMEO and
|
SO_RCVTIMEO use a struct timeval parameter, defined in <sys/time.h>.
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SO_RCVTIMEO use a struct timeval parameter, defined in <sys/time.h>.
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|
|
The following options are recognized at the socket level. Except as
|
The following options are recognized at the socket level. Except as
|
noted, each may be examined with getsockopt() and set with setsockopt().
|
noted, each may be examined with getsockopt() and set with setsockopt().
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|
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SO_DEBUG enables recording of debugging information
|
SO_DEBUG enables recording of debugging information
|
SO_REUSEADDR enables local address reuse
|
SO_REUSEADDR enables local address reuse
|
SO_REUSEPORT enables duplicate address and port bindings
|
SO_REUSEPORT enables duplicate address and port bindings
|
SO_KEEPALIVE enables keep connections alive
|
SO_KEEPALIVE enables keep connections alive
|
SO_DONTROUTE enables routing bypass for outgoing messages
|
SO_DONTROUTE enables routing bypass for outgoing messages
|
SO_LINGER linger on close if data present
|
SO_LINGER linger on close if data present
|
SO_BROADCAST enables permission to transmit broadcast messages
|
SO_BROADCAST enables permission to transmit broadcast messages
|
SO_OOBINLINE enables reception of out-of-band data in band
|
SO_OOBINLINE enables reception of out-of-band data in band
|
SO_SNDBUF set buffer size for output
|
SO_SNDBUF set buffer size for output
|
SO_RCVBUF set buffer size for input
|
SO_RCVBUF set buffer size for input
|
SO_SNDLOWAT set minimum count for output
|
SO_SNDLOWAT set minimum count for output
|
SO_RCVLOWAT set minimum count for input
|
SO_RCVLOWAT set minimum count for input
|
SO_SNDTIMEO set timeout value for output
|
SO_SNDTIMEO set timeout value for output
|
SO_RCVTIMEO set timeout value for input
|
SO_RCVTIMEO set timeout value for input
|
SO_TYPE get the type of the socket (get only)
|
SO_TYPE get the type of the socket (get only)
|
SO_ERROR get and clear error on the socket (get only)
|
SO_ERROR get and clear error on the socket (get only)
|
|
|
SO_DEBUG enables debugging in the underlying protocol modules.
|
SO_DEBUG enables debugging in the underlying protocol modules.
|
SO_REUSEADDR indicates that the rules used in validating addresses sup-
|
SO_REUSEADDR indicates that the rules used in validating addresses sup-
|
plied in a bind(2) call should allow reuse of local addresses.
|
plied in a bind(2) call should allow reuse of local addresses.
|
SO_REUSEPORT allows completely duplicate bindings by multiple processes
|
SO_REUSEPORT allows completely duplicate bindings by multiple processes
|
if they all set SO_REUSEPORT before binding the port. This option per-
|
if they all set SO_REUSEPORT before binding the port. This option per-
|
mits multiple instances of a program to each receive UDP/IP multicast or
|
mits multiple instances of a program to each receive UDP/IP multicast or
|
broadcast datagrams destined for the bound port. SO_KEEPALIVE enables
|
broadcast datagrams destined for the bound port. SO_KEEPALIVE enables
|
the periodic transmission of messages on a connected socket. Should the
|
the periodic transmission of messages on a connected socket. Should the
|
connected party fail to respond to these messages, the connection is con-
|
connected party fail to respond to these messages, the connection is con-
|
sidered broken and processes using the socket are notified via a SIGPIPE
|
sidered broken and processes using the socket are notified via a SIGPIPE
|
signal when attempting to send data. SO_DONTROUTE indicates that outgo-
|
signal when attempting to send data. SO_DONTROUTE indicates that outgo-
|
ing messages should bypass the standard routing facilities. Instead,
|
ing messages should bypass the standard routing facilities. Instead,
|
messages are directed to the appropriate network interface according to
|
messages are directed to the appropriate network interface according to
|
the network portion of the destination address.
|
the network portion of the destination address.
|
|
|
SO_LINGER controls the action taken when unsent messages are queued on
|
SO_LINGER controls the action taken when unsent messages are queued on
|
socket and a close(2) is performed. If the socket promises reliable
|
socket and a close(2) is performed. If the socket promises reliable
|
delivery of data and SO_LINGER is set, the system will block the process
|
delivery of data and SO_LINGER is set, the system will block the process
|
on the close(2) attempt until it is able to transmit the data or until it
|
on the close(2) attempt until it is able to transmit the data or until it
|
decides it is unable to deliver the information (a timeout period mea-
|
decides it is unable to deliver the information (a timeout period mea-
|
sured in seconds, termed the linger interval, is specified in the
|
sured in seconds, termed the linger interval, is specified in the
|
setsockopt() call when SO_LINGER is requested). If SO_LINGER is disabled
|
setsockopt() call when SO_LINGER is requested). If SO_LINGER is disabled
|
and a close(2) is issued, the system will process the close in a manner
|
and a close(2) is issued, the system will process the close in a manner
|
that allows the process to continue as quickly as possible.
|
that allows the process to continue as quickly as possible.
|
|
|
The option SO_BROADCAST requests permission to send broadcast datagrams
|
The option SO_BROADCAST requests permission to send broadcast datagrams
|
on the socket. Broadcast was a privileged operation in earlier versions
|
on the socket. Broadcast was a privileged operation in earlier versions
|
of the system. With protocols that support out-of-band data, the
|
of the system. With protocols that support out-of-band data, the
|
SO_OOBINLINE option requests that out-of-band data be placed in the nor-
|
SO_OOBINLINE option requests that out-of-band data be placed in the nor-
|
mal data input queue as received; it will then be accessible with recv(2)
|
mal data input queue as received; it will then be accessible with recv(2)
|
or read(2) calls without the MSG_OOB flag. Some protocols always behave
|
or read(2) calls without the MSG_OOB flag. Some protocols always behave
|
as if this option is set. SO_SNDBUF and SO_RCVBUF are options to adjust
|
as if this option is set. SO_SNDBUF and SO_RCVBUF are options to adjust
|
the normal buffer sizes allocated for output and input buffers, respec-
|
the normal buffer sizes allocated for output and input buffers, respec-
|
tively. The buffer size may be increased for high-volume connections, or
|
tively. The buffer size may be increased for high-volume connections, or
|
may be decreased to limit the possible backlog of incoming data. The
|
may be decreased to limit the possible backlog of incoming data. The
|
system places an absolute limit on these values.
|
system places an absolute limit on these values.
|
|
|
SO_SNDLOWAT is an option to set the minimum count for output operations.
|
SO_SNDLOWAT is an option to set the minimum count for output operations.
|
Most output operations process all of the data supplied by the call,
|
Most output operations process all of the data supplied by the call,
|
delivering data to the protocol for transmission and blocking as neces-
|
delivering data to the protocol for transmission and blocking as neces-
|
sary for flow control. Nonblocking output operations will process as
|
sary for flow control. Nonblocking output operations will process as
|
much data as permitted subject to flow control without blocking, but will
|
much data as permitted subject to flow control without blocking, but will
|
process no data if flow control does not allow the smaller of the low
|
process no data if flow control does not allow the smaller of the low
|
water mark value or the entire request to be processed. A select(2) or
|
water mark value or the entire request to be processed. A select(2) or
|
poll(2) operation testing the ability to write to a socket will return
|
poll(2) operation testing the ability to write to a socket will return
|
true only if the low water mark amount could be processed. The default
|
true only if the low water mark amount could be processed. The default
|
value for SO_SNDLOWAT is set to a convenient size for network efficiency,
|
value for SO_SNDLOWAT is set to a convenient size for network efficiency,
|
often 1024. SO_RCVLOWAT is an option to set the minimum count for input
|
often 1024. SO_RCVLOWAT is an option to set the minimum count for input
|
operations. In general, receive calls will block until any (non-zero)
|
operations. In general, receive calls will block until any (non-zero)
|
amount of data is received, then return with the smaller of the amount
|
amount of data is received, then return with the smaller of the amount
|
available or the amount requested. The default value for SO_RCVLOWAT is
|
available or the amount requested. The default value for SO_RCVLOWAT is
|
1. If SO_RCVLOWAT is set to a larger value, blocking receive calls nor-
|
1. If SO_RCVLOWAT is set to a larger value, blocking receive calls nor-
|
mally wait until they have received the smaller of the low water mark
|
mally wait until they have received the smaller of the low water mark
|
value or the requested amount. Receive calls may still return less than
|
value or the requested amount. Receive calls may still return less than
|
the low water mark if an error occurs, a signal is caught, or the type of
|
the low water mark if an error occurs, a signal is caught, or the type of
|
data next in the receive queue is different than that returned.
|
data next in the receive queue is different than that returned.
|
|
|
SO_SNDTIMEO is an option to set a timeout value for output operations.
|
SO_SNDTIMEO is an option to set a timeout value for output operations.
|
It accepts a struct timeval parameter with the number of seconds and
|
It accepts a struct timeval parameter with the number of seconds and
|
microseconds used to limit waits for output operations to complete. If a
|
microseconds used to limit waits for output operations to complete. If a
|
send operation has blocked for this much time, it returns with a partial
|
send operation has blocked for this much time, it returns with a partial
|
count or with the error EWOULDBLOCK if no data was sent. In the current
|
count or with the error EWOULDBLOCK if no data was sent. In the current
|
implementation, this timer is restarted each time additional data are
|
implementation, this timer is restarted each time additional data are
|
delivered to the protocol, implying that the limit applies to output por-
|
delivered to the protocol, implying that the limit applies to output por-
|
tions ranging in size from the low water mark to the high water mark for
|
tions ranging in size from the low water mark to the high water mark for
|
output. SO_RCVTIMEO is an option to set a timeout value for input opera-
|
output. SO_RCVTIMEO is an option to set a timeout value for input opera-
|
tions. It accepts a struct timeval parameter with the number of seconds
|
tions. It accepts a struct timeval parameter with the number of seconds
|
and microseconds used to limit waits for input operations to complete.
|
and microseconds used to limit waits for input operations to complete.
|
In the current implementation, this timer is restarted each time addi-
|
In the current implementation, this timer is restarted each time addi-
|
tional data are received by the protocol, and thus the limit is in effect
|
tional data are received by the protocol, and thus the limit is in effect
|
an inactivity timer. If a receive operation has been blocked for this
|
an inactivity timer. If a receive operation has been blocked for this
|
much time without receiving additional data, it returns with a short
|
much time without receiving additional data, it returns with a short
|
count or with the error EWOULDBLOCK if no data were received.
|
count or with the error EWOULDBLOCK if no data were received.
|
|
|
Finally, SO_TYPE and SO_ERROR are options used only with getsockopt().
|
Finally, SO_TYPE and SO_ERROR are options used only with getsockopt().
|
SO_TYPE returns the type of the socket, such as SOCK_STREAM; it is useful
|
SO_TYPE returns the type of the socket, such as SOCK_STREAM; it is useful
|
for servers that inherit sockets on startup. SO_ERROR returns any pend-
|
for servers that inherit sockets on startup. SO_ERROR returns any pend-
|
ing error on the socket and clears the error status. It may be used to
|
ing error on the socket and clears the error status. It may be used to
|
check for asynchronous errors on connected datagram sockets or for other
|
check for asynchronous errors on connected datagram sockets or for other
|
asynchronous errors.
|
asynchronous errors.
|
|
|
RETURN VALUES
|
RETURN VALUES
|
A 0 is returned if the call succeeds, -1 if it fails.
|
A 0 is returned if the call succeeds, -1 if it fails.
|
|
|
ERRORS
|
ERRORS
|
The call succeeds unless:
|
The call succeeds unless:
|
|
|
[EBADF] The argument s is not a valid descriptor.
|
[EBADF] The argument s is not a valid descriptor.
|
|
|
[ENOTSOCK] The argument s is a file, not a socket.
|
[ENOTSOCK] The argument s is a file, not a socket.
|
|
|
[ENOPROTOOPT] The option is unknown at the level indicated.
|
[ENOPROTOOPT] The option is unknown at the level indicated.
|
|
|
[EFAULT] The address pointed to by optval is not in a valid
|
[EFAULT] The address pointed to by optval is not in a valid
|
part of the process address space. For getsockopt(),
|
part of the process address space. For getsockopt(),
|
this error may also be returned if optlen is not in a
|
this error may also be returned if optlen is not in a
|
valid part of the process address space.
|
valid part of the process address space.
|
|
|
SEE ALSO
|
SEE ALSO
|
connect(2), ioctl(2), poll(2), select(2), poll(2), socket(2),
|
connect(2), ioctl(2), poll(2), select(2), poll(2), socket(2),
|
getprotoent(3), protocols(5)
|
getprotoent(3), protocols(5)
|
|
|
BUGS
|
BUGS
|
Several of the socket options should be handled at lower levels of the
|
Several of the socket options should be handled at lower levels of the
|
system.
|
system.
|
|
|
HISTORY
|
HISTORY
|
The getsockopt() system call appeared in 4.2BSD.
|
The getsockopt() system call appeared in 4.2BSD.
|
|
|
BSD February 15, 1999 BSD
|
BSD February 15, 1999 BSD
|
</PRE
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