case of gid_map , use of the setgroups (2) system call must first be denied ... setfsgid (2), setregid (2), setresgid (2), and setgroups (2). Writing " deny " to the /proceffective, and saved-set user (group) IDs. setgroups (2) Modify the process's supplementary group ... setfsgid (2), setfsuid (2), setgid (2), setgroups (2), setpgid (2), setresgid …setreuid (2), setresgid (2), setresuid (2), and setgroups (2). STANDARDS For details of the conformancecalling process (as set by setgroups (2)). When neither holds, the third group is used