uidinfo(9)

NAME

uidinfo, uihashinit, uifind, uihold, uifree - functions for

managing UID
information

SYNOPSIS

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
void
uihashinit(void);
struct uidinfo *
uifind(uid_t uid);
void
uihold(struct uidinfo *uip);
void
uifree(struct uidinfo *uip);

DESCRIPTION

The uidinfo family of functions is used to manage uidinfo

structures.
Each uidinfo structure maintains per uid resource consump

tion counts,
including the process count and socket buffer space usage.

The uihashinit() function initializes the uidinfo hash table

and its
mutex. This function should only be called during system

initialization.

The uifind() function looks up and returns the uidinfo

structure for uid.
If no uidinfo structure exists for uid, a new structure will

be allocated
and initialized. The uidinfo hash mutex is acquired and re

leased.

The uihold() function increases the reference count on uip.

uip's lock
is acquired and released.

The uifree() function decreases the reference count on uip,

and if the
count reaches 0 uip is freed. uip's lock is acquired and

release and the
uidinfo hash mutex may be acquired and released.

RETURN VALUES

uifind() returns a pointer to an initialized uidinfo struc

ture, and
should not fail.

AUTHORS

This manual page was written by Chad David <davidc@ac

ns.ab.ca>.

BSD July 10, 2001

BSD