MirBSD manpage: initgroups(3)

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

NAME

     initgroups - initialize supplementary group IDs

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. 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.

RETURN VALUES

     The initgroups() function returns -1 if it was not invoked by the su-
     peruser.

SEE ALSO

     setgroups(2), getgrouplist(3)

HISTORY

     The initgroups() function appeared in 4.2BSD.

BUGS

     The getgrouplist(3) 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().

MirBSD #10-current               June 4, 1993                                1