From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/missing/flock.c | 130 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 jni/ruby/missing/flock.c

(limited to 'jni/ruby/missing/flock.c')

diff --git a/jni/ruby/missing/flock.c b/jni/ruby/missing/flock.c
new file mode 100644
index 0000000..829f431
--- /dev/null
+++ b/jni/ruby/missing/flock.c
@@ -0,0 +1,130 @@
+#include "ruby/config.h"
+#include "ruby/ruby.h"
+
+#if defined _WIN32
+#elif defined HAVE_FCNTL && defined HAVE_FCNTL_H && !defined(__native_client__)
+
+/* These are the flock() constants.  Since this systems doesn't have
+   flock(), the values of the constants are probably not available.
+*/
+# ifndef LOCK_SH
+#  define LOCK_SH 1
+# endif
+# ifndef LOCK_EX
+#  define LOCK_EX 2
+# endif
+# ifndef LOCK_NB
+#  define LOCK_NB 4
+# endif
+# ifndef LOCK_UN
+#  define LOCK_UN 8
+# endif
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+int
+flock(int fd, int operation)
+{
+    struct flock lock;
+
+    switch (operation & ~LOCK_NB) {
+    case LOCK_SH:
+	lock.l_type = F_RDLCK;
+	break;
+    case LOCK_EX:
+	lock.l_type = F_WRLCK;
+	break;
+    case LOCK_UN:
+	lock.l_type = F_UNLCK;
+	break;
+    default:
+	errno = EINVAL;
+	return -1;
+    }
+    lock.l_whence = SEEK_SET;
+    lock.l_start = lock.l_len = 0L;
+
+    return fcntl(fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &lock);
+}
+
+#elif defined(HAVE_LOCKF)
+
+#include <unistd.h>
+#include <errno.h>
+
+/*  Emulate flock() with lockf() or fcntl().  This is just to increase
+    portability of scripts.  The calls might not be completely
+    interchangeable.  What's really needed is a good file
+    locking module.
+*/
+
+# ifndef F_ULOCK
+#  define F_ULOCK	0	/* Unlock a previously locked region */
+# endif
+# ifndef F_LOCK
+#  define F_LOCK	1	/* Lock a region for exclusive use */
+# endif
+# ifndef F_TLOCK
+#  define F_TLOCK	2	/* Test and lock a region for exclusive use */
+# endif
+# ifndef F_TEST
+#  define F_TEST	3	/* Test a region for other processes locks */
+# endif
+
+/* These are the flock() constants.  Since this systems doesn't have
+   flock(), the values of the constants are probably not available.
+*/
+# ifndef LOCK_SH
+#  define LOCK_SH 1
+# endif
+# ifndef LOCK_EX
+#  define LOCK_EX 2
+# endif
+# ifndef LOCK_NB
+#  define LOCK_NB 4
+# endif
+# ifndef LOCK_UN
+#  define LOCK_UN 8
+# endif
+
+int
+flock(int fd, int operation)
+{
+    switch (operation) {
+
+	/* LOCK_SH - get a shared lock */
+      case LOCK_SH:
+        rb_notimplement();
+        return -1;
+	/* LOCK_EX - get an exclusive lock */
+      case LOCK_EX:
+	return lockf (fd, F_LOCK, 0);
+
+	/* LOCK_SH|LOCK_NB - get a non-blocking shared lock */
+      case LOCK_SH|LOCK_NB:
+        rb_notimplement();
+        return -1;
+	/* LOCK_EX|LOCK_NB - get a non-blocking exclusive lock */
+      case LOCK_EX|LOCK_NB:
+	return lockf (fd, F_TLOCK, 0);
+
+	/* LOCK_UN - unlock */
+      case LOCK_UN:
+	return lockf (fd, F_ULOCK, 0);
+
+	/* Default - can't decipher operation */
+      default:
+	errno = EINVAL;
+        return -1;
+    }
+}
+#else
+int
+flock(int fd, int operation)
+{
+    rb_notimplement();
+    return -1;
+}
+#endif
-- 
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