Initial commit

tasks/libposix/lseek.c

@@ -0,0 +1,41 @@
+/*
+ * l4/posix glue for lseek()
+ *
+ * Copyright (C) 2007 Bahadir Balban
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <l4lib/arch/syscalls.h>
+#include <l4lib/arch/syslib.h>
+#include <l4lib/ipcdefs.h>
+
+static inline off_t l4_lseek(int fildes, off_t offset, int whence)
+{
+	off_t offres;
+
+	write_mr(L4SYS_ARG0, fildes);
+	write_mr(L4SYS_ARG1, offset);
+	write_mr(L4SYS_ARG2, whence);
+
+	/* Call pager with shmget() request. Check ipc error. */
+	if ((errno = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_LSEEK)) < 0) {
+		printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, errno);
+		return -1;
+	}
+	/* Check if syscall itself was successful */
+	if ((offres = l4_get_retval()) < 0) {
+		printf("%s: OPEN Error: %d.\n", __FUNCTION__, (int)offres);
+		errno = (int)offres;
+		return -1;
+
+	}
+	return offres;
+}
+
+off_t lseek(int fildes, off_t offset, int whence)
+{
+	return l4_lseek(fildes, offset, whence);
+}
+