summaryrefslogtreecommitdiff
path: root/i/pc104/initrd/conf/busybox/libbb/device_open.c
diff options
context:
space:
mode:
Diffstat (limited to 'i/pc104/initrd/conf/busybox/libbb/device_open.c')
-rw-r--r--i/pc104/initrd/conf/busybox/libbb/device_open.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/libbb/device_open.c b/i/pc104/initrd/conf/busybox/libbb/device_open.c
new file mode 100644
index 0000000..2b35ad8
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/libbb/device_open.c
@@ -0,0 +1,30 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* try to open up the specified device */
+int device_open(const char *device, int mode)
+{
+ int m, f, fd = -1;
+
+ m = mode | O_NONBLOCK;
+
+ /* Retry up to 5 times */
+ /* TODO: explain why it can't be considered insane */
+ for (f = 0; f < 5; f++)
+ if ((fd = open(device, m, 0600)) >= 0)
+ break;
+ if (fd < 0)
+ return fd;
+ /* Reset original flags. */
+ if (m != mode)
+ fcntl(fd, F_SETFL, mode);
+ return fd;
+}