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SETFIB(2)		      System Calls Manual		     SETFIB(2)

NAME
       setfib -- set the default FIB (routing table) for the calling process

LIBRARY
       Standard	C Library (libc, -lc)

SYNOPSIS
       #include	<sys/socket.h>

       int
       setfib(int fib);

DESCRIPTION
       The  setfib()  system  call sets	the associated FIB (routing table) for
       all sockets opened subsequent to	the call, to be	that of	 the  argument
       fib.  The fib argument must be greater than or equal to 0 and less than
       the  current  system  maximum  which  may  be retrieved by the net.fibs
       sysctl.	The system maximum is set in  the  kernel  configuration  file
       with

	     options ROUTETABLES=N

       or in /boot/loader.conf or /etc/sysctl.conf with

	     net.fibs="N"

       where N is an integer smaller than 65536.  Note that the	number of FIBs
       may be increased	after booting, but cannot be reduced.

       The  maximum of 65536 is	due to the implementation storing the FIB num-
       ber in a	16-bit field in	the mbuf(9) packet header, however it  is  not
       suggested  that	one use	such a large number as memory is allocated for
       every FIB regardless of whether it is used, and there are places	 where
       all FIBs	are iterated over.

       The default FIB of the process will be applied to all protocol families
       that  support multiple FIBs, and	ignored	by those that do not.  The de-
       fault FIB for a process may be overridden for a socket with the use  of
       the SO_SETFIB socket option.

RETURN VALUES
       The  setfib() function returns the value	0 if successful; otherwise the
       value -1	is returned and	the global variable errno is set  to  indicate
       the error.

ERRORS
       The  setfib() system call will fail and no action will be taken and re-
       turn EINVAL if the fib argument is greater than the current system max-
       imum.

SEE ALSO
       setfib(1), setsockopt(2)

STANDARDS
       The setfib() system call	is a FreeBSD extension however similar	exten-
       sions have been added to	many other Unix	style kernels.

HISTORY
       The setfib() function appeared in FreeBSD 7.1.

FreeBSD	14.3		       January 10, 2025			     SETFIB(2)

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