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RocketLink!--> Man page versions: OpenBSD FreeBSD RedHat Solaris Others

INITGROUPS(3)             OpenBSD Programmer's Manual            INITGROUPS(3)

     initgroups - initialize supplementary group IDs

     #include <unistd.h>

     initgroups(const char *name, gid_t basegid);

     The initgroups() function uses the getgrouplist(3) function to calculate
     the supplementary group IDs for the user specified in name. This group
     list then set up for the current process using setgroups(2).  The basegid
     is automatically included in the group list.  Typically this value is
     given as the group number from the password file.

     If the groups database lists more than NGROUPS groups for name (including
     one for basegid), the later groups are ignored.

     The initgroups() function returns -1 if it was not invoked by the super-

     setgroups(2),  getgrouplist(3)

     The initgroups() function appeared in 4.2BSD.

     The getgrouplist(3) function called by initgroups() uses the routines
     based on getgrent(3).  If the invoking program uses any of these rou-
     tines, the group structure will be overwritten in the call to

OpenBSD 2.6                      June 4, 1993                                1

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]
FreeBSD Sources for initgroups(3) functions
OpenBSD sources for initgroups(3)

[Overview Topics]

Up to: Process Limits: Identity - Process ownership and Identity

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