From: Davidlohr Bueso <dave@xxxxxxx>
Based on libmnt, this patch adds basic debugging support for fdisk. Currently only CONTEXT is debugged, yet keeps exact functionality
as libmnt/libblkid.
Signed-off-by: Davidlohr Bueso <dave@xxxxxxx>
---
fdisk/fdisk.c | 2 ++
fdisk/fdisk.h | 27 +++++++++++++++++++++++++++
fdisk/utils.c | 33 ++++++++++++++++++++++++++++++++-
3 files changed, 61 insertions(+), 1 deletions(-)
diff --git a/fdisk/fdisk.c b/fdisk/fdisk.c
index 400e682..9b91fa0 100644
--- a/fdisk/fdisk.c
+++ b/fdisk/fdisk.c
@@ -2168,6 +2168,8 @@ int main(int argc, char **argv)
}
}
+ fdisk_init_debug(0);
+
if (user_set_sector_size && argc-optind != 1)
printf(_("Warning: the -b (set sector size) option should"
" be used with one specified device\n"));
diff --git a/fdisk/fdisk.h b/fdisk/fdisk.h
index c43517c..2471541 100644
--- a/fdisk/fdisk.h
+++ b/fdisk/fdisk.h
@@ -32,6 +32,33 @@
#define cround(n) (display_in_cyl_units ? ((n)/units_per_sector)+1 : (n))
#define scround(x) (((x)+units_per_sector-1)/units_per_sector)
+/* fdisk debugging flags/options */
+#define FDISK_DEBUG_INIT (1 << 1)
+#define FDISK_DEBUG_CONTEXT (1 << 2)
+#define FDISK_DEBUG_ALL 0xFFFF
+
+# define ON_DBG(m, x) do { \
+ if ((FDISK_DEBUG_ ## m) & fdisk_debug_mask) { \
+ x; \
+ } \
+ } while (0)
+
+# define DBG(m, x) do { \
+ if ((FDISK_DEBUG_ ## m) & fdisk_debug_mask) { \
+ fprintf(stderr, "%d: fdisk: %8s: ", getpid(), # m); \
+ x; \
+ } \
+ } while (0)
+
+# define DBG_FLUSH do { \
+ if (fdisk_debug_mask && \
+ fdisk_debug_mask != FDISK_DEBUG_INIT) \
+ fflush(stderr); \
+ } while(0)
+
+extern int fdisk_debug_mask;
+extern void fdisk_init_debug(int mask);
+
struct partition {
unsigned char boot_ind; /* 0x80 - active */
unsigned char head; /* starting head */
diff --git a/fdisk/utils.c b/fdisk/utils.c
index ad83d7f..9f071a6 100644
--- a/fdisk/utils.c
+++ b/fdisk/utils.c
@@ -23,6 +23,35 @@
#include "common.h"
#include "fdisk.h"
+int fdisk_debug_mask;
+
+/**
+ * fdisk_init_debug:
+ * @mask: debug mask (0xffff to enable full debuging)
+ *
+ * If the @mask is not specified then this function reads
+ * FDISK_DEBUG environment variable to get the mask.
+ *
+ * Already initialized debugging stuff cannot be changed. It does not
+ * have effect to call this function twice.
+ */
+void fdisk_init_debug(int mask)
+{
+ if (fdisk_debug_mask & FDISK_DEBUG_INIT)
+ return;
+ if (!mask) {
+ char *str = getenv("FDISK_DEBUG");
+ if (str)
+ fdisk_debug_mask = strtoul(str, 0, 0);
+ } else
+ fdisk_debug_mask = mask;
+
+ if (fdisk_debug_mask)
+ printf("fdisk: debug mask set to 0x%04x.\n",
+ fdisk_debug_mask);
+ fdisk_debug_mask |= FDISK_DEBUG_INIT;
+}
+
/**
* fdisk_new_context:
*
@@ -37,9 +66,11 @@ struct fdisk_context *fdisk_new_context_from_filename(const char *fname)
* Attempt to open the device with r-w permissions
* by default, otherwise try read-only.
*/
- if ((fd = open(fname, O_RDWR)) < 0)
+ if ((fd = open(fname, O_RDWR)) < 0) {
if ((fd = open(fname, O_RDONLY)) < 0)
goto ret;
+ DBG(CONTEXT, printf("opened %s as read-only\n", fname));
+ }
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
--
1.7.4.1
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