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    Command:

    setsockopt

    
    
    

    SYNOPSIS

           #include <sys/types.h>          /* See NOTES */
           #include <sys/socket.h>
    
           int getsockopt(int sockfd, int level, int optname,
                          void *optval, socklen_t *optlen);
           int setsockopt(int sockfd, int level, int optname,
                          const void *optval, socklen_t optlen);
    
    
    

    DESCRIPTION

           getsockopt()   and  setsockopt()  manipulate  options  for  the  socket
           referred to by the file descriptor sockfd.  Options may exist at multi-
           ple  protocol  levels;  they are always present at the uppermost socket
           level.
    
           When manipulating socket options, the level at which the option resides
           and the name of the option must be specified.  To manipulate options at
           the sockets API level, level is specified as SOL_SOCKET.  To manipulate
           options  at any other level the protocol number of the appropriate pro-
           tocol controlling the option is supplied.   For  example,  to  indicate
           that  an  option is to be interpreted by the TCP protocol, level should
           be set to the protocol number of TCP; see getprotoent(3).
    
           The arguments optval and optlen are used to access  option  values  for
           setsockopt().   For  getsockopt()  they  identify a buffer in which the
           value for the requested option(s) are to  be  returned.   For  getsock-
           opt(), optlen is a value-result argument, initially containing the size
           of the buffer pointed to by optval, and modified on return to  indicate
           the  actual  size  of  the value returned.  If no option value is to be
           supplied or returned, optval may be NULL.
    
           Optname and any specified  options  are  passed  uninterpreted  to  the
           appropriate  protocol  module  for  interpretation.   The  include file
           <sys/socket.h> contains definitions for socket level options, described
           below.   Options at other protocol levels vary in format and name; con-
           sult the appropriate entries in section 4 of the manual.
    
           Most socket-level options utilize an int argument for optval.  For set-
           sockopt(),  the  argument should be nonzero to enable a boolean option,
           or zero if the option is to be disabled.
    
           For a description of the available socket options see socket(7) and the
           appropriate protocol man pages.
    
    
    

    RETURN VALUE

           On  success,  zero is returned.  On error, -1 is returned, and errno is
           set appropriately.
    
    
    

    ERRORS

           EBADF     The argument sockfd is not a valid descriptor.
    
           EFAULT    The address pointed to by optval is not in a  valid  part  of
           SVr4,   4.4BSD   (these   system   calls  first  appeared  in  4.2BSD),
           POSIX.1-2001.
    
    
    

    NOTES

           POSIX.1-2001 does not require the inclusion of <sys/types.h>, and  this
           header  file  is not required on Linux.  However, some historical (BSD)
           implementations required this header file,  and  portable  applications
           are probably wise to include it.
    
           The  optlen  argument of getsockopt() and setsockopt() is in reality an
           int [*] (and this is what 4.x BSD and  libc4  and  libc5  have).   Some
           POSIX  confusion resulted in the present socklen_t, also used by glibc.
           See also accept(2).
    
    
    

    BUGS

           Several of the socket options should be handled at lower levels of  the
           system.
    
    
    

    SEE ALSO

           ioctl(2),  socket(2),  getprotoent(3),  protocols(5), ip(7), socket(7),
           tcp(7), udp(7), unix(7)
    
    
    

    Linux 2014-01-24 GETSOCKOPT(2)

    
    
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