Add SYSV semaphore test

This patch adds a simple SYSV semaphore test to check for correct
argument passing on kernel.  The idea is neither to be an extensive
testing nor to check for any specific Linux test.

	* sysvipc/Makefile (tests): Add test-sysvsem.
	* sysvipc/test-sysvsem.c: New file.

2 files changed, 117 insertions, 1 deletions

diff --git a/sysvipc/Makefile b/sysvipc/Makefile
index 73bb9cfaf6..32d64dc0a5 100644
--- a/sysvipc/Makefile
+++ b/sysvipc/Makefile
@@ -30,7 +30,7 @@ routines := ftok \
 	    semop semget semctl semtimedop \
 	    shmat shmdt shmget shmctl
 
-tests    := test-sysvmsg
+tests    := test-sysvmsg test-sysvsem
 
 include ../Rules
 
diff --git a/sysvipc/test-sysvsem.c b/sysvipc/test-sysvsem.c
new file mode 100644
index 0000000000..fd9db4feeb
--- /dev/null
+++ b/sysvipc/test-sysvsem.c
@@ -0,0 +1,116 @@
+/* Basic tests for SYSV semaphore functions.
+   Copyright (C) 2016 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+
+#include <support/support.h>
+#include <support/check.h>
+#include <support/temp_file.h>
+
+/* These are for the temporary file we generate.  */
+static char *name;
+static int semid;
+
+static void
+remove_sem (void)
+{
+  /* Enforce message queue removal in case of early test failure.
+     Ignore error since the sem may already have being removed.  */
+  semctl (semid, 0, IPC_RMID, 0);
+}
+
+static void
+do_prepare (int argc, char *argv[])
+{
+  int fd = create_temp_file ("tst-sysvsem.", &name);
+  if (fd == -1)
+    FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
+}
+
+#define PREPARE do_prepare
+
+/* It is not an extensive test, but rather a functional one aimed to check
+   correct parameter passing on kernel.  */
+
+#define SEM_MODE 0644
+
+static int
+do_test (void)
+{
+  atexit (remove_sem);
+
+  key_t key = ftok (name, 'G');
+  if (key == -1)
+    FAIL_EXIT1 ("ftok failed");
+
+  semid = semget(key, 1, IPC_CREAT | IPC_EXCL | SEM_MODE);
+  if (semid == -1)
+    {
+      if (errno == ENOSYS)
+	FAIL_UNSUPPORTED ("msgget not supported");
+      FAIL_EXIT1 ("semget failed (errno=%d)", errno);
+    }
+
+  /* Get semaphore kernel information and do some sanity checks.  */
+  struct semid_ds seminfo;
+  if (semctl (semid, 0, IPC_STAT, &seminfo) == -1)
+    FAIL_EXIT1 ("semctl with IPC_STAT failed (errno=%d)", errno);
+
+  if (seminfo.sem_perm.__key != key)
+    FAIL_EXIT1 ("semid_ds::sem_perm::key (%d) != %d",
+		(int) seminfo.sem_perm.__key, (int) key);
+  if (seminfo.sem_perm.mode != SEM_MODE)
+    FAIL_EXIT1 ("semid_ds::sem_perm::mode (%o) != %o",
+		seminfo.sem_perm.mode, SEM_MODE);
+  if (seminfo.sem_nsems != 1)
+    FAIL_EXIT1 ("semid_ds::sem_nsems (%lu) != 1",
+		(long unsigned) seminfo.sem_nsems);
+
+  /* Some lock/unlock basic tests.  */
+  struct sembuf sb1 = { 0, 1, 0 };
+  if (semop (semid, &sb1, 1) == -1)
+    FAIL_EXIT1 ("semop failed (errno=%i)", errno);
+
+  struct sembuf sb2 = { 0, -1, 0 };
+  if (semop (semid, &sb2, 1) == -1)
+    FAIL_EXIT1 ("semop failed (errno=%i)", errno);
+
+#ifdef _GNU_SOURCE
+  /* Set a time for half a second.  The semaphore operation should timeout
+     with EAGAIN.  */
+  struct timespec ts = { 0 /* sec */, 500000000 /* nsec */ };
+  if (semtimedop (semid, &sb2, 1, &ts) != -1
+      || (errno != EAGAIN && errno != ENOSYS))
+    FAIL_EXIT1 ("semtimedop succeed or returned errno != {EAGAIN,ENOSYS} "
+		"(errno=%i)", errno);
+#endif
+
+  /* Finally free up the semnaphore resource.  */
+  if (semctl (semid, 0, IPC_RMID, 0) == -1)
+    FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
+
+  return 0;
+}
+
+#include <support/test-driver.c>