initgroups(3C)                 DG/UX R4.11MU05                initgroups(3C)


NAME
       initgroups - initialize the supplementary group access list

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

       int initgroups (const char *name, gid_t 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
       supplementary 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 {NGROUPS_MAX}, subsequent group entries are
       ignored.

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

       EPERM          The effective user id is not 0.

       initgroups uses the routines based on getgrent(3C).  If the invoking
       program uses any of these routines, the group structure will be
       overwritten in the call to initgroups


   Considerations for Threads Programming
                    +-----------+-----------------------------+
                    |           |                      async- |
                    |function   | reentrant   cancel   cancel |
                    |           |             point     safe  |
                    +-----------+-----------------------------+
                    |initgroups |     N         -        -    |
                    +-----------+-----------------------------+

SEE ALSO
       setgroups(2), reentrant(3), getgrent(3C).

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


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