initgroups(3C)                                               initgroups(3C)

NAME
     initgroups - initialize the supplementary group access list

SYNOPSIS
     #include <grp.h>
     #include <sys/types.h>

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

DESCRIPTION
     initgroups() reads the group file, using getgrent(), to get the group
     membership for the user specified by name and then initializes the
     supplementary group access list of the calling process using
     setgroups(). The basegid group id is also included in the supplemen-
     tary group access list. This is typically the real group id from the
     password file.

     While scanning the group file, if the number of groups, including the
     basegid entry, exceeds NGROUPSMAX, subsequent group entries are
     ignored.

     initgroups() will fail and not change the supplementary group access
     list if:

     EPERM     The effective user id is not superuser.

RESULT
     Upon successful completion, a value of 0 is returned. Otherwise, a
     value of -1 is returned and errno is set to indicate the error.

SEE ALSO
     setgroups(2), getgrent(3C), grp(5), types(5).























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