SYNOPSIS
In sys/param.h In sys/ucred.h Ft int Fn groupmember gid_t gid struct ucred *credDESCRIPTION
The Fn groupmember function checks to see if the given Fa gid is in the group set of the credentials.Its arguments are:
- Fa gid
- The group ID to check for.
- Fa cred
- The credentials to search for the group in.