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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
commit97d5c458cfa039d857301e1ca7d5af3beb37131d (patch)
treeb460cd850d0537eb71806ba30358840377b27688 /static/v10/man2/limits.2
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-.TH LIMITS 2 SHARE-deprecated
-.SH NAME
-limits \- return or set limits structure
-.SH SYNOPSIS
-.B #include <sys/types.h>
-.br
-.B #include <sys/lnode.h>
-.br
-.B #include <sys/retlim.h>
-.br
-.B #include <sys/share.h>
-.P
-.B limits(address, function)
-.br
-.B struct lnode *address;
-.br
-.B int function;
-.SH DESCRIPTION
-This system call manipulates a kernel limits structure
-according to the value of
-.IR function .
-Except where indicated below,
-.I address
-points to an
-.I lnode
-or an array of
-.IR lnodes .
-.LP
-.RS 2
-.nf
-.ta \w'\s-1L_DEADGROUP\s0XX'u +\w'ValueXX'u
-Function Value Meaning
-\s-1L_MYLIM\s0 0 Get user's own limits structure.
-\s-1L_OTHLIM\s0 1 Get limits associated with uid in lnode.
-\s-1L_ALLLIM\s0 2 All active limits structures are returned.
-\s-1L_SETLIM\s0 3* Connect to a new limits structure.
-\s-1L_DEADLIM\s0 4 Wait for dead limits belonging to child.
-\s-1L_CHNGLIM\s0 5* Changes limits fields in existing limits.
-\s-1L_DEADGROUP\s0 6* Pick up a dead limits structure.
-\s-1L_GETCOSTS\s0 7 Get contents of system ``shconsts'' table.
-\s-1L_SETCOSTS\s0 8* Set contents of system ``shconsts'' table.
-\s-1L_MYKN\s0 9 Get user's own ``kern_lnode'' structure.
-\s-1L_OTHKN\s0 10 Get structure associated with uid.
-\s-1L_ALLKN\s0 11 All active structures are returned.
-.fi
-.RE
-.P
-The starred functions in the list are super\-user only.
-.P
-For
-.SM L_MYKN,
-.SM L_OTHKN,
-and
-.SM L_ALLKN
-.I address
-should point to a ``struct kern_lnode''
-defined in
-.IR <sys/lnode.h> .
-For
-.SM L_SETCOSTS
-and
-.SM L_GETCOSTS
-.I address
-should point to a ``struct shconsts''
-defined in
-.IR <sys/share.h> .
-For
-.SM L_DEADLIM
-.I address
-should point to a ``struct retlim'' defined in
-.IR <sys/retlim.h> .
-.P
-.SM L_OTHLIM
-and
-.SM L_CHNGLIM
-require that the lnode pointed to by
-.I address
-contains the correct uid.
-.SM L_OTHKN
-requires that the kern_lnode pointed to by
-.I address
-contains the correct uid.
-.SM L_MYLIM,
-.SM L_MYKN,
-.SM L_OTHLIM,
-and
-.SM L_OTHKN
-all return the number of processes currently attached to the node.
-.SM L_ALLLIM
-and
-.SM L_ALLKN
-both return the number of active nodes returned.
-.P
-.SM L_SETLIM
-initialises a new limits structure with the passed lnode,
-and attaches the calling process to it.
-All children of that process will inherit the new structure.
-.P
-.SM L_DEADGROUP
-looks for a dead limits structure,
-removes it from the list of active limits,
-and returns the lnode.
-.P
-.SM L_DEADLIM
-performs a
-.IR wait (2)
-system call,
-then returns a structure containing both the limits and process zombie structures.
-The value returned is the number of processes still attached to the node.
-.P
-.SM L_SETCOST
-and
-.SM L_GETCOST
-deal with the constants structure for the scheduling algorithm.
-.P
-Any other function is illegal, and will return an error of EINVAL.
-Unless otherwise specified the
-call returns the number of limits structures returned.
-.SH DIAGNOSTICS
-.B ESRCH
-can be returned in
-.I errno
-by functions
-.SM L_DEADGROUP,
-.SM L_OTHKN,
-.SM L_OTHLIM
-and
-.SM L_CHNGLIM
-to indicate that
-the desired limits structure does not exist.
-.B ESRCH
-can also be returned by
-.SM L_SETLIM
-to indicate that this lnode's group has not been set-up.
-.P
-.B ETOOMANYU
-is returned in errno for
-.SM L_SETLIM
-if there is no space left in the kernel limits table.
-.P
-Any error causes a \-1 to be returned.
-.SH "SEE ALSO"
-setlimits(3),
-lnode(5),
-share(5).