Locking based on fcntl instead of flock.

[idzebra-moved-to-github.git] / index / lockutil.c

diff --git a/index/lockutil.c b/index/lockutil.c
index acd6541..79dd0dc 100644 (file)
--- a/index/lockutil.c
+++ b/index/lockutil.c
@@ -4,17 +4,22 @@
  * Sebastian Hammer, Adam Dickmeiss
  *
  * $Log: lockutil.c,v $
- * Revision 1.1  1995-12-07 17:38:47  adam
+ * Revision 1.2  1995-12-11 11:43:29  adam
+ * Locking based on fcntl instead of flock.
+ * Setting commitEnable removed. Command line option -n can be used to
+ * prevent commit if commit setting is defined in the configuration file.
+ *
+ * Revision 1.1  1995/12/07  17:38:47  adam
  * Work locking mechanisms for concurrent updates/commit.
  *
  */
 #include <stdio.h>
 #include <assert.h>
-#include <unistd.h>
-#include <sys/file.h>
-#include <fcntl.h>
 #include <string.h>
 #include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <unistd.h>
 
 #include <alexutil.h>
 #include "index.h"
@@ -31,3 +36,27 @@ void zebraLockPrefix (char *pathPrefix)
     if (*pathPrefix && pathPrefix[strlen(pathPrefix)-1] != '/')
         strcat (pathPrefix, "/");
 }
+
+static int intLock (int fd, int type, int cmd)
+{
+    struct flock area;
+    area.l_type = type;
+    area.l_whence = SEEK_SET;
+    area.l_len = area.l_start = 0L;
+    return fcntl (fd, cmd, &area);
+}
+
+int zebraLock (int fd, int wr)
+{
+    return intLock (fd, wr ? F_WRLCK : F_RDLCK, F_SETLKW);
+}
+
+int zebraLockNB (int fd, int wr)
+{
+    return intLock (fd, wr ? F_WRLCK : F_RDLCK, F_SETLK);
+}
+
+int zebraUnlock (int fd)
+{
+    return intLock (fd, F_UNLCK, F_SETLKW);
+}