Rewrite of the following commit but adjusted pre-64-bit time_t
conversion. We want to follow the same upstream behaviour and return
EINVAL for unknown commands rather than to attempt the command with an
argument of {0} which has likely never been tested upstream.

commit a16d2abd496bd974a88207d5599265aae5ae4880
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Sep 29 14:29:48 2020 -0300

    sysvipc: Return EINVAL for invalid semctl commands
    
    It avoids regressions on possible future commands that might require
    additional libc support.  The downside is new commands added by newer
    kernels will need further glibc support.
    
    Checked on x86_64-linux-gnu and i686-linux-gnu (Linux v4.15 and v5.4).

diff --git a/sysdeps/unix/sysv/linux/semctl.c b/sysdeps/unix/sysv/linux/semctl.c
index bdf31ca7747fe5a4..03c56c69a5412c82 100644
--- a/sysdeps/unix/sysv/linux/semctl.c
+++ b/sysdeps/unix/sysv/linux/semctl.c
@@ -58,6 +58,15 @@ __new_semctl (int semid, int semnum, int cmd, ...)
       arg = va_arg (ap, union semun);
       va_end (ap);
       break;
+    case IPC_RMID:      /* arg ignored.  */
+    case GETNCNT:
+    case GETPID:
+    case GETVAL:
+    case GETZCNT:
+      break;
+    default:
+      __set_errno (EINVAL);
+      return -1;
     }
 
 #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
diff --git a/sysvipc/test-sysvipc.h b/sysvipc/test-sysvipc.h
new file mode 100644
index 0000000000000000..d7ed496511c10afb
--- /dev/null
+++ b/sysvipc/test-sysvipc.h
@@ -0,0 +1,85 @@
+/* Basic definition for Sysv IPC test functions.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _TEST_SYSV_H
+#define _TEST_SYSV_H
+
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/msg.h>
+#include <sys/shm.h>
+#include <include/array_length.h>
+
+/* Return the first invalid command SysV IPC command from common shared
+   between message queue, shared memory, and semaphore.  */
+static inline int
+first_common_invalid_cmd (void)
+{
+  const int common_cmds[] = {
+    IPC_RMID,
+    IPC_SET,
+    IPC_STAT,
+    IPC_INFO,
+  };
+
+  int invalid = 0;
+  for (int i = 0; i < array_length (common_cmds); i++)
+    {
+      if (invalid == common_cmds[i])
+	{
+	  invalid++;
+	  i = 0;
+        }
+    }
+
+  return invalid;
+}
+
+/* Return the first invalid command SysV IPC command for semaphore.  */
+static inline int
+first_sem_invalid_cmd (void)
+{
+  const int sem_cmds[] = {
+    GETPID,
+    GETVAL,
+    GETALL,
+    GETNCNT,
+    GETZCNT,
+    SETVAL,
+    SETALL,
+    SEM_STAT,
+    SEM_INFO,
+#ifdef SEM_STAT_ANY
+    SEM_STAT_ANY,
+#endif
+  };
+
+  int invalid = first_common_invalid_cmd ();
+  for (int i = 0; i < array_length (sem_cmds); i++)
+    {
+      if (invalid == sem_cmds[i])
+	{
+	  invalid++;
+	  i = 0;
+	}
+    }
+
+  return invalid;
+}
+
+#endif /* _TEST_SYSV_H  */
diff --git a/sysvipc/test-sysvsem.c b/sysvipc/test-sysvsem.c
index d197772917a7579d..43a1460ec2b9308f 100644
--- a/sysvipc/test-sysvsem.c
+++ b/sysvipc/test-sysvsem.c
@@ -25,6 +25,8 @@
 #include <sys/ipc.h>
 #include <sys/sem.h>
 
+#include <test-sysvipc.h>
+
 #include <support/support.h>
 #include <support/check.h>
 #include <support/temp_file.h>
@@ -80,6 +82,9 @@ do_test (void)
       FAIL_EXIT1 ("semget failed (errno=%d)", errno);
     }
 
+  TEST_COMPARE (semctl (semid, 0, first_sem_invalid_cmd (), NULL), -1);
+  TEST_COMPARE (errno, EINVAL);
+
   /* Get semaphore kernel information and do some sanity checks.  */
   struct semid_ds seminfo;
   if (semctl (semid, 0, IPC_STAT, (union semun) { .buf = &seminfo }) == -1)