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-rw-r--r--sysdeps/unix/sysv/linux/tst-sysvsem-linux.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-sysvsem-linux.c b/sysdeps/unix/sysv/linux/tst-sysvsem-linux.c
new file mode 100644
index 0000000000..45f19e2d37
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-sysvsem-linux.c
@@ -0,0 +1,184 @@
+/* Basic tests for Linux SYSV semaphore extensions.
+   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/>.  */
+
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdio.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[])
+{
+  TEST_VERIFY_EXIT (create_temp_file ("tst-sysvsem.", &name) != -1);
+}
+
+#define PREPARE do_prepare
+
+#define SEM_MODE 0644
+
+union semun
+{
+  int val;
+  struct semid_ds *buf;
+  unsigned short  *array;
+  struct seminfo *__buf;
+};
+
+struct test_seminfo
+{
+  int semmsl;
+  int semmns;
+  int semopm;
+  int semmni;
+};
+
+/* It tries to obtain some system-wide SysV semaphore information from /proc
+   to check against IPC_INFO/SEM_INFO.  The /proc only returns the tunables
+   value of SEMMSL, SEMMNS, SEMOPM, and SEMMNI.
+
+   The kernel also returns constant value for SEMVMX, SEMMNU, SEMMAP, SEMUME,
+   and also SEMUSZ and SEMAEM (for IPC_INFO).  The issue to check them is they
+   might change over kernel releases.  */
+
+static void
+read_sem_stat (struct test_seminfo *tseminfo)
+{
+  FILE *f = fopen ("/proc/sys/kernel/sem", "r");
+  if (f == NULL)
+    FAIL_UNSUPPORTED ("/proc is not mounted or /proc/sys/kernel/sem is not "
+		      "available");
+
+  int r = fscanf (f, "%d %d %d %d",
+		  &tseminfo->semmsl, &tseminfo->semmns, &tseminfo->semopm,
+		  &tseminfo->semmni);
+  TEST_VERIFY_EXIT (r == 4);
+
+  fclose (f);
+}
+
+
+/* Check if the semaphore with IDX (index into the kernel's internal array)
+   matches the one with KEY.  The CMD is either SEM_STAT or SEM_STAT_ANY.  */
+
+static bool
+check_seminfo (int idx, key_t key, int cmd)
+{
+  struct semid_ds seminfo;
+  int sid = semctl (idx, 0, cmd, (union semun) { .buf = &seminfo });
+  /* Ignore unused array slot returned by the kernel or information from
+     unknown semaphores.  */
+  if ((sid == -1 && errno == EINVAL) || sid != semid)
+    return false;
+
+  if (sid == -1)
+    FAIL_EXIT1 ("semctl with SEM_STAT failed (errno=%d)", errno);
+
+  TEST_COMPARE (seminfo.sem_perm.__key, key);
+  TEST_COMPARE (seminfo.sem_perm.mode, SEM_MODE);
+  TEST_COMPARE (seminfo.sem_nsems, 1);
+
+  return true;
+}
+
+static int
+do_test (void)
+{
+  atexit (remove_sem);
+
+  key_t key = ftok (name, 'G');
+  if (key == -1)
+    FAIL_EXIT1 ("ftok failed: %m");
+
+  semid = semget (key, 1, IPC_CREAT | IPC_EXCL | SEM_MODE);
+  if (semid == -1)
+    FAIL_EXIT1 ("semget failed: %m");
+
+  struct test_seminfo tipcinfo;
+  read_sem_stat (&tipcinfo);
+
+  int semidx;
+
+  {
+    struct seminfo ipcinfo;
+    semidx = semctl (semid, 0, IPC_INFO, (union semun) { .__buf = &ipcinfo });
+    if (semidx == -1)
+      FAIL_EXIT1 ("semctl with IPC_INFO failed: %m");
+
+    TEST_COMPARE (ipcinfo.semmsl, tipcinfo.semmsl);
+    TEST_COMPARE (ipcinfo.semmns, tipcinfo.semmns);
+    TEST_COMPARE (ipcinfo.semopm, tipcinfo.semopm);
+    TEST_COMPARE (ipcinfo.semmni, tipcinfo.semmni);
+  }
+
+  /* Same as before but with SEM_INFO.  */
+  {
+    struct seminfo ipcinfo;
+    semidx = semctl (semid, 0, SEM_INFO, (union semun) { .__buf = &ipcinfo });
+    if (semidx == -1)
+      FAIL_EXIT1 ("semctl with IPC_INFO failed: %m");
+
+    TEST_COMPARE (ipcinfo.semmsl, tipcinfo.semmsl);
+    TEST_COMPARE (ipcinfo.semmns, tipcinfo.semmns);
+    TEST_COMPARE (ipcinfo.semopm, tipcinfo.semopm);
+    TEST_COMPARE (ipcinfo.semmni, tipcinfo.semmni);
+  }
+
+  /* We check if the created semaphore shows in the system-wide status.  */
+  bool found = false;
+  for (int i = 0; i <= semidx; i++)
+    {
+      /* We can't tell apart if SEM_STAT_ANY is not supported (kernel older
+	 than 4.17) or if the index used is invalid.  So it just check if
+	 value returned from a valid call matches the created semaphore.  */
+      check_seminfo (i, key, SEM_STAT_ANY);
+
+      if (check_seminfo (i, key, SEM_STAT))
+	{
+	  found = true;
+	  break;
+	}
+    }
+
+  if (!found)
+    FAIL_EXIT1 ("semctl with SEM_STAT/SEM_STAT_ANY could not find the "
+		"created  semaphore");
+
+  if (semctl (semid, 0, IPC_RMID, 0) == -1)
+    FAIL_EXIT1 ("semctl failed: %m");
+
+  return 0;
+}
+
+#include <support/test-driver.c>