Decode UID/GID in -y mode

Decode UID/GID in -y mode

* defs.h (RVAL_UID, RVAL_GID): New macro constants.
(printgid): New function declaration.
* ipc_msgctl.c (print_msqid_ds, print_msqid_ds): Use printgid for
printing GID.
* ipc_shmctl.c (print_shmid_ds, print_shmid_ds): Likewise.
* keyctl.c (keyctl_chown_key): Likewise.
* nlattr.c (decode_nla_gid): Likewise.
* linux/dummy.h (sys_getgid, sys_getgid16, sys_getresgid,
sys_getresgid16, sys_setfsgid, sys_setfsgid16, sys_setgid, sys_setgid16,
sys_setregid, sys_setregid16, sys_setresgid, sys_setresgid16): Remove
macros.
(sys_getegid): Define to sys_getgid instead of sys_getuid.
(sys_getegid16): Define to sys_getgid16 instead of sys_geteuid16.
* linux/syscall.h (getresgid16, getgid16, setfsgid16, setresgid16,
setregid16, setgid16): New external SYS_FUNC declarations.
* msghdr.c (print_scm_creds); Use PRINT_FIELD_GID for printing GID.
* net.c (print_get_ucred): Likewise.
* netlink_inet_diag.c (decode_inet_diag_msg): Likewise.
* netlink_smc_diag.c (decode_smc_diag_msg): Likewise.
* print_fields.h (PRINT_FIELD_UID); Use printuid for printing UID.
(PRINT_FIELD_GID): New macro.
* print_struct_stat.c (print_struct_stat): Use printuid for printing
UID, printgid for printing GID.
* printsiginfo.c (printsigsource): Use printuid for printing UID.
* resource.c (print_priority_who): New function.
(SYS_FUNC(getpriority), SYS_FUNC(setpriority)): Use print_priority_who
for printing the second argument.
* statx.c (SYS_FUNC(statx)): Use PRINT_FIELD_UID for printing UID,
PRINT_FIELD_GID for printing GID.
* syscall.c (syscall_exiting_trace): Handle RVAL_UID and RVAL_GID.
* tests/overflowuid.c: Include stdio.h.
(printuid): New function.
* tests/setfsugid.c (printugid): Rename from printuid, update call
sites.
* tests/setgroups.c: Likewise.
* tests/setugid.c: Likewise.
* tests/tests.h (printuid): New declaration.
* uid.c (printgid, sys_getresgid, sys_getgid, sys_setfsgid,
sys_setresgid, sys_setregid, sys_setgid): Add SIZEIFY wrappers.
(gid_t, gid_t_, gid_t__): Define similarly to uid_t, uid_t_, uid_t__.
Include grp.h, pwd.h, sys/types.h.
(enum id_type): New enumeration.
(SYS_FUNC(getuid), SYS_FUNC(setfsuid), ): Return RVAL_UID flag.
(SYS_FUNC(getgid), SYS_FUNC(setfsgid), SYS_FUNC(setgid),
SYS_FUNC(getresgid), SYS_FUNC(setregid), SYS_FUNC(setresgid)): New
functions.
(get_print_id): Rename from get_print_uid, add idt argument, call
printuid or printgid depending on it. Update call sites.
(SYS_FUNC(chown), SYS_FUNC(fchown), print_gid): Use printgid
for printing GID.
(ID_CACHE_SIZE): New macro constant.
(print_id): New function.
(printuid): Implement using print_id.
(printgid): New function.
* xlat/priorities.in: Provide fallback values.