minix/lib/libc/gen/getgrouplist.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

152 lines
5.2 KiB
Groff

.\" $NetBSD: getgrouplist.3,v 1.14 2008/05/02 18:11:04 martin Exp $
.\"
.\" Copyright (c) 2005 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Luke Mewburn.
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.\" @(#)getgrouplist.3 8.1 (Berkeley) 6/9/93
.\"
.Dd January 6, 2005
.Dt GETGROUPLIST 3
.Os
.Sh NAME
.Nm getgrouplist ,
.Nm getgroupmembership ,
.Nd calculate group access list
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn getgrouplist "const char *name" "gid_t basegid" "gid_t *groups" "int *ngroups"
.Ft int
.Fn getgroupmembership "const char *name" "gid_t basegid" "gid_t *groups" "int maxgrp" "int *ngroups"
.Sh DESCRIPTION
The
.Fn getgrouplist
and
.Fn getgroupmembership
functions read through the group database and calculate
the group access list for the user specified in
.Fa name .
The
.Fa basegid
is automatically included in the groups list.
Typically this value is given as
the group number from the password database.
.Pp
The resulting group list is returned in the integer array pointed to by
.Fa groups .
.Pp
For
.Fn getgrouplist ,
the caller specifies the size of the
.Fa groups
array in the integer pointed to by
.Fa ngroups .
.Pp
For
.Fn getgroupmembership ,
the caller specifies the size of the
.Fa groups
array in
.Fa maxgrp .
.Pp
The actual number of groups found is returned in
.Fa ngroups .
.Pp
Duplicate group ids will be suppressed from the result.
.Sh RETURN VALUES
The
.Fn getgrouplist
and
.Fn 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
.Fa groups
array will be filled with as many groups as will fit and
.Fa ngroups
will contain the total number of groups found.
.Sh FILES
.Bl -tag -width /etc/group -compact
.It Pa /etc/group
group membership list
.El
.Sh SEE ALSO
.Xr setgroups 2 ,
.Xr initgroups 3 ,
.Xr group 5
.Sh HISTORY
The
.Fn getgrouplist
function first appeared in
.Bx 4.4 .
The
.Fn getgroupmembership
function first appeared in
.Nx 3.0
to address an API deficiency in
.Fn getgrouplist .
.Sh BUGS
The
.Fn getgrouplist
function
uses the routines based on
.Xr getgrent 3 .
If the invoking program uses any of these routines,
the group structure will
be overwritten in the call to
.Fn getgrouplist .