minix/lib/libc/gen/initgroups.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

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.\" $NetBSD: initgroups.3,v 1.15 2003/08/07 16:42:51 agc Exp $
.\"
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.\" @(#)initgroups.3 8.1 (Berkeley) 6/4/93
.\"
.Dd August 10, 2002
.Dt INITGROUPS 3
.Os
.Sh NAME
.Nm initgroups
.Nd initialize supplementary group IDs
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn initgroups "const char *name" "gid_t basegid"
.Sh DESCRIPTION
The
.Fn initgroups
function
uses the
.Xr getgrouplist 3
function to calculate the supplementary group IDs for the user
specified in
.Fa name .
This group list is then set up for the current process using
.Xr setgroups 2 .
The
.Fa basegid
is automatically included in the group list.
Typically this value is given as
the group number from the password file.
.Pp
If the groups database lists more than
.Ev NGROUPS
groups for
.Fa name
(including one for
.Fa basegid ) ,
the later groups are ignored.
.Sh RETURN VALUES
The
.Fn initgroups
function
returns \-1 if it was not invoked by the super-user.
.Sh SEE ALSO
.Xr setgroups 2 ,
.Xr getgrouplist 3
.Sh HISTORY
The
.Fn initgroups
function appeared in
.Bx 4.2 .
.Sh BUGS
The
.Fn getgrouplist
function called by
.Fn initgroups
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 initgroups .