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NetBSD 6.1.5 - man page for initgroups (netbsd section 3)

INITGROUPS(3)			   BSD Library Functions Manual 		    INITGROUPS(3)

NAME
     initgroups -- initialize supplementary group IDs

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     initgroups(const char *name, gid_t basegid);

DESCRIPTION
     The initgroups() function uses the getgrouplist(3) function to calculate the supplementary
     group IDs for the user specified in name.	This group list is then set up for the current
     process using setgroups(2).  The basegid is automatically included in the group list.  Typi-
     cally 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.

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

SEE ALSO
     setgroups(2), getgrouplist(3)

HISTORY
     The initgroups() function appeared in 4.2BSD.

BUGS
     The getgrouplist() function called by 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().

BSD					 August 10, 2002				      BSD


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