1 files changed, 79 insertions, 0 deletions
diff --git a/lib/ext2fs/llseek.c b/lib/ext2fs/llseek.c
new file mode 100644
index 00000000..00fe3cdc
--- /dev/null
+++ b/lib/ext2fs/llseek.c
@@ -0,0 +1,79 @@
+/*
+ * llseek.c -- stub calling the llseek system call
+ *
+ * Copyright (C) 1994 Remy Card.  This file may be redistributed
+ * under the terms of the GNU Public License.
+ */
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <unistd.h>
+#include <linux/unistd.h>
+#include "et/com_err.h"
+#include "ext2fs/io.h"
+
+#ifdef __linux__
+
+#ifndef __NR__llseek
+#define __NR__llseek            140
+#endif
+
+static int _llseek (unsigned int, unsigned long,
+		   unsigned long, ext2_loff_t *, unsigned int);
+
+static _syscall5(int,_llseek,unsigned int,fd,unsigned long,offset_high,
+		 unsigned long, offset_low,ext2_loff_t *,result,
+		 unsigned int, origin)
+
+ext2_loff_t ext2_llseek (unsigned int fd, ext2_loff_t offset,
+			 unsigned int origin)
+{
+	unsigned long offset_high;
+	unsigned long offset_low;
+	ext2_loff_t result;
+	int retval;
+	static int do_compat = 0;
+
+	if (do_compat) {
+	compat_lseek:
+		if ((sizeof(off_t) < sizeof(ext2_loff_t)) &&
+		    (offset >= ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))) {
+			errno = -EINVAL;
+			return -1;
+		}
+		return lseek (fd, (off_t) offset, origin);
+	}
+	
+	offset_high = ((unsigned long long) offset) >> 32;
+	offset_low = ((unsigned long long) offset) & 0xffffffff;
+	retval = _llseek (fd, offset_high, offset_low, &result, origin);
+	if (retval == -1 && errno == ENOSYS) {
+		/*
+		 * Just in case this code runs on top of an old kernel
+		 * which does not support the llseek system call
+		 */
+		do_compat++;
+		goto compat_lseek;
+	}
+	if (retval == -1)
+		result = -1;
+	return result;
+}
+
+#else
+
+ext2_loff_t ext2_llseek (unsigned int fd, ext2_loff_t offset,
+			 unsigned int origin)
+{
+	if ((sizeof(off_t) < sizeof(ext2_loff_t)) &&
+	    (offset >= ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))) {
+		errno = -EINVAL;
+		return -1;
+	}
+	return lseek (fd, (off_t) offset, origin);
+}
+
+#endif
+
+