getgroups(2)                                                   getgroups(2)

NAME
     getgroups, setgroups - get/set group IDs

SYNOPSIS
     #include <unistd.h>

     int getgroups(int gidsetsize, gidt grouplist[ ])

     int setgroups(int ngroups, const gidt grouplist[ ])

DESCRIPTION
     getgroups() gets the current supplementary group access list of the
     calling process and stores the result in the array of group IDs speci-
     fied by grouplist. This array has gidsetsize entries and must be large
     enough to contain the entire list. This list cannot be greater than
     NGROUPSMAX. If gidsetsize equals 0, getgroups() will return the
     number of groups to which the calling process belongs without modify-
     ing 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 can not be greater than
     NGROUPSMAX. 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 NGROUPSMAX.

     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 out-
            side of the allocated address space of the process.

RESULT
     Upon successful completion, getgroups() returns the number of supple-
     mentary group IDs set for the calling process and setgroups() returns
     the value 0. Otherwise, a value of -1 is returned and errno is set to
     indicate the error.

SEE ALSO
     groups(1), chown(2), getuid(2), setuid(2), initgroups(3C).







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