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-rw-r--r--libmount/src/init.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/libmount/src/init.c b/libmount/src/init.c
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+++ b/libmount/src/init.c
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * This file is part of libmount from util-linux project.
+ *
+ * Copyright (C) 2008-2018 Karel Zak <kzak@redhat.com>
+ *
+ * libmount is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+/**
+ * SECTION: init
+ * @title: Library initialization
+ * @short_description: initialize debugging
+ */
+
+#include <stdarg.h>
+
+#include "mountP.h"
+
+UL_DEBUG_DEFINE_MASK(libmount);
+UL_DEBUG_DEFINE_MASKNAMES(libmount) =
+{
+ { "all", MNT_DEBUG_ALL, "info about all subsystems" },
+ { "cache", MNT_DEBUG_CACHE, "paths and tags cache" },
+ { "cxt", MNT_DEBUG_CXT, "library context (handler)" },
+ { "diff", MNT_DEBUG_DIFF, "mountinfo changes tracking" },
+ { "fs", MNT_DEBUG_FS, "FS abstraction" },
+ { "help", MNT_DEBUG_HELP, "this help" },
+ { "locks", MNT_DEBUG_LOCKS, "mtab and utab locking" },
+ { "loop", MNT_DEBUG_LOOP, "loop devices routines" },
+ { "options", MNT_DEBUG_OPTIONS, "mount options parsing" },
+ { "tab", MNT_DEBUG_TAB, "fstab, mtab, mountinfo routines" },
+ { "update", MNT_DEBUG_UPDATE, "mtab, utab updates" },
+ { "utils", MNT_DEBUG_UTILS, "misc library utils" },
+ { "monitor", MNT_DEBUG_MONITOR, "mount tables monitor" },
+ { "btrfs", MNT_DEBUG_BTRFS, "btrfs specific routines" },
+ { "verity", MNT_DEBUG_VERITY, "verity specific routines" },
+
+ { NULL, 0 }
+};
+
+/**
+ * mnt_init_debug:
+ * @mask: debug mask (0xffff to enable full debugging)
+ *
+ * If the @mask is not specified, then this function reads
+ * the LIBMOUNT_DEBUG environment variable to get the mask.
+ *
+ * Already initialized debugging stuff cannot be changed. Calling
+ * this function twice has no effect.
+ */
+void mnt_init_debug(int mask)
+{
+ if (libmount_debug_mask)
+ return;
+
+ __UL_INIT_DEBUG_FROM_ENV(libmount, MNT_DEBUG_, mask, LIBMOUNT_DEBUG);
+
+ if (libmount_debug_mask != MNT_DEBUG_INIT
+ && libmount_debug_mask != (MNT_DEBUG_HELP|MNT_DEBUG_INIT)) {
+ const char *ver = NULL;
+ const char **features = NULL, **p;
+
+ mnt_get_library_version(&ver);
+ mnt_get_library_features(&features);
+
+ DBG(INIT, ul_debug("library debug mask: 0x%04x", libmount_debug_mask));
+ DBG(INIT, ul_debug("library version: %s", ver));
+ p = features;
+ while (p && *p)
+ DBG(INIT, ul_debug(" feature: %s", *p++));
+ }
+
+ ON_DBG(HELP, ul_debug_print_masks("LIBMOUNT_DEBUG",
+ UL_DEBUG_MASKNAMES(libmount)));
+}
+
+#ifdef TEST_PROGRAM
+
+#include <errno.h>
+#include <stdlib.h>
+int main(int argc, char *argv[])
+{
+ if (argc == 2) {
+ int mask;
+
+ errno = 0;
+ mask = strtoul(argv[1], 0, 0);
+
+ if (errno)
+ return 1;
+
+ mnt_init_debug(mask);
+ }
+ else if (argc == 1) {
+ mnt_init_debug(0);
+ } else
+ return 1;
+
+ return 0;
+}
+#endif /* TEST_PROGRAM */
+