GETGROUPS(2-SVR4)   RISC/os Reference Manual    GETGROUPS(2-SVR4)



NAME
     getgroups, setgroups - get or set supplementary group access
          list IDs

SYNOPSIS
     #include <unistd.h>

     int getgroups(int gidsetsize, gidt *grouplist)

     int setgroups(int ngroups, const gidt *grouplist)

DESCRIPTION
     getgroups gets the current supplemental group access list of
     the calling process and stores the result in the array of
     group IDs specified by grouplist.  This array has gidsetsize
     entries and must be large enough to contain the entire list.
     This list cannot be greater than {NGROUPS_MAX}.  If gidset-
     size equals 0, getgroups will return the number of groups to
     which the calling process belongs without modifying the
     array pointed to by grouplist.

     setgroups sets the supplementary group access list of the
     calling process from the array of group IDs specified by
     grouplist.  The number of entries is specified by ngroups
     and cannot be greater than {NGROUPS_MAX}.  This function may
     be invoked only by the superuser.

     getgroups will fail if:

     EINVAL         The value of gidsetsize is non-zero and less
                    than the number of supplementary group IDs
                    set for the calling process.

     setgroups will fail if:

     EINVAL         The value of ngroups is greater than
                    {NGROUPS_MAX}.

     EPERM          The effective user ID is not superuser.

     Either call will fail if:

     EFAULT         A referenced part of the array pointed to by
                    grouplist is outside of the allocated address
                    space of the process.

SEE ALSO
     chown(2), getuid(2), setuid(2), initgroups(3C).
     groups(1) in the User's Reference Manual.

DIAGNOSTICS
     Upon successful completion, getgroups returns the number of



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GETGROUPS(2-SVR4)   RISC/os Reference Manual    GETGROUPS(2-SVR4)



     supplementary group IDs set for the calling process and set-
     groups returns the value 0.  Otherwise, a value of -1 is
     returned and errno is set to indicate the error.




















































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