Import of code from heimdal

This commit updates the code imported from heimdal to
987658325eb7bd6b10882cc4cdd224499e7f7a03 (switch-from-svn-to-git-2052-g9876583)

New files are:
	roken/flock.c

Change-Id: I7b9470cfdf99e41ea460772025767c47f6ad26f0
Reviewed-on: http://gerrit.openafs.org/4367
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>

diff --git a/src/external/heimdal/roken/flock.c b/src/external/heimdal/roken/flock.c
new file mode 100644 (file)
index 0000000..6dd2120
--- /dev/null
+++ b/src/external/heimdal/roken/flock.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#ifndef HAVE_FLOCK
+
+#include "roken.h"
+
+#define OP_MASK (LOCK_SH | LOCK_EX | LOCK_UN)
+
+
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+rk_flock(int fd, int operation)
+{
+#if defined(HAVE_FCNTL) && defined(F_SETLK)
+  struct flock arg;
+  int code, cmd;
+
+  arg.l_whence = SEEK_SET;
+  arg.l_start = 0;
+  arg.l_len = 0;               /* means to EOF */
+
+  if (operation & LOCK_NB)
+    cmd = F_SETLK;
+  else
+    cmd = F_SETLKW;            /* Blocking */
+
+  switch (operation & OP_MASK) {
+  case LOCK_UN:
+    arg.l_type = F_UNLCK;
+    code = fcntl(fd, F_SETLK, &arg);
+    break;
+  case LOCK_SH:
+    arg.l_type = F_RDLCK;
+    code = fcntl(fd, cmd, &arg);
+    break;
+  case LOCK_EX:
+    arg.l_type = F_WRLCK;
+    code = fcntl(fd, cmd, &arg);
+    break;
+  default:
+    errno = EINVAL;
+    code = -1;
+    break;
+  }
+  return code;
+
+#elif defined(_WIN32)
+  /* Windows */
+
+#define FLOCK_OFFSET_LOW  0
+#define FLOCK_OFFSET_HIGH 0
+#define FLOCK_LENGTH_LOW  0x00000000
+#define FLOCK_LENGTH_HIGH 0x80000000
+
+  HANDLE hFile;
+  OVERLAPPED ov;
+  BOOL rv = FALSE;
+  DWORD f = 0;
+
+  hFile = (HANDLE) _get_osfhandle(fd);
+  if (hFile == NULL || hFile == INVALID_HANDLE_VALUE) {
+      _set_errno(EBADF);
+      return -1;
+  }
+
+  ZeroMemory(&ov, sizeof(ov));
+  ov.hEvent = NULL;
+  ov.Offset = FLOCK_OFFSET_LOW;
+  ov.OffsetHigh = FLOCK_OFFSET_HIGH;
+
+  if (operation & LOCK_NB)
+      f = LOCKFILE_FAIL_IMMEDIATELY;
+
+  switch (operation & OP_MASK) {
+  case LOCK_UN:                        /* Unlock */
+      rv = UnlockFileEx(hFile, 0,
+                       FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH, &ov);
+      break;
+
+  case LOCK_SH:                        /* Shared lock */
+      rv = LockFileEx(hFile, f, 0,
+                     FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH, &ov);
+      break;
+
+  case LOCK_EX:                        /* Exclusive lock */
+      rv = LockFileEx(hFile, f|LOCKFILE_EXCLUSIVE_LOCK, 0,
+                     FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH,
+                     &ov);
+      break;
+
+  default:
+      _set_errno(EINVAL);
+      return -1;
+  }
+
+  if (!rv) {
+      switch (GetLastError()) {
+      case ERROR_SHARING_VIOLATION:
+      case ERROR_LOCK_VIOLATION:
+      case ERROR_IO_PENDING:
+         _set_errno(EWOULDBLOCK);
+         break;
+
+      case ERROR_ACCESS_DENIED:
+         _set_errno(EACCES);
+         break;
+
+      default:
+         _set_errno(ENOLCK);
+      }
+      return -1;
+  }
+
+  return 0;
+
+#else
+  return -1;
+#endif
+}
+
+#endif