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BSD 2.11 - man page for initgroups (bsd section 3)

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INITGROUPS(3)									    INITGROUPS(3)

NAME
       initgroups - initialize group access list

SYNOPSIS
       initgroups(name, basegid)
       char *name;
       int basegid;

DESCRIPTION
       Initgroups  reads  through  the	group  file and sets up, using the setgroups(2) call, 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
       file.

FILES
       /etc/group

SEE ALSO
       setgroups(2)

DIAGNOSTICS
       Initgroups returns -1 if it was not invoked by the super-user.

BUGS
       Initgroups 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 initgroups.

4.2 Berkeley Distribution		   May 12, 1986 			    INITGROUPS(3)
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