int
getgrouplist(
const char *name
, gid_t basegid
, gid_t *groups
, int *ngroups
)
int
getgroupmembership(
const char *name
, gid_t basegid
, gid_t *groups
, int maxgrp
, int *ngroups
)
)
and
getgroupmembership(
)
functions read through the group database and calculate
the group access list for the user specified in
name
.
The
basegid
is automatically included in the groups list.
Typically this value is given as
the group number from the password database.
The resulting group list is returned in the integer array pointed to by
groups
.
For
getgrouplist(),
the caller specifies the size of the
groups
array in the integer pointed to by
ngroups
.
For
getgroupmembership(),
the caller specifies the size of the
groups
array in
maxgrp
.
The actual number of groups found is returned in
ngroups
.
Duplicate group ids will be suppressed from the result.
)
and
getgroupmembership(
)
functions
return 0 if successful, and
return -1 if the size of the group list is too small to
hold all the user's groups.
In the latter case, the
groups
array will be filled with as many groups as will fit and
ngroups
will contain the total number of groups found.
/etc/group
)
function first appeared in
4.4BSD.
The
getgroupmembership(
)
function first appeared in
NetBSD3.0
to address an API deficiency in
getgrouplist(
).
)
function
uses the routines based on
getgrent(3).
If the invoking program uses any of these routines,
the group structure will
be overwritten in the call to
getgrouplist(
).