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Define macros that will become the new logging API (Eduardo Habkost)

These macros are NOT a proposal for a definitive new logging API. They
are just a step for it: a way to mark all usage patterns of the
logfile/loglevel variables on a single place.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6333 c046a42c-6fe2-441c-8c8c-71466251a162
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1 parent d12d51d commit 6d2c51466e694895ed6cfe4b4bc8cd40300947bd aliguori committed Jan 15, 2009
Showing with 86 additions and 0 deletions.
  1. +86 −0 qemu-log.h
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86 qemu-log.h
@@ -1,7 +1,93 @@
#ifndef QEMU_LOG_H
#define QEMU_LOG_H
+/* The deprecated global variables: */
extern FILE *logfile;
extern int loglevel;
+
+/*
+ * The new API:
+ *
+ */
+
+/* Log settings checking macros: */
+
+/* Returns true if qemu_log() will really write somewhere
+ */
+#define qemu_log_enabled() (logfile != NULL)
+
+/* Returns true if a bit is set in the current loglevel mask
+ */
+#define qemu_loglevel_mask(b) ((loglevel & (b)) != 0)
+
+
+/* Logging functions: */
+
+/* main logging function
+ */
+#define qemu_log(...) do { \
+ if (logfile) \
+ fprintf(logfile, ## __VA_ARGS__); \
+ } while (0)
+
+/* vfprintf-like logging function
+ */
+#define qemu_log_vprintf(fmt, va) do { \
+ if (logfile) \
+ vfprintf(logfile, fmt, va); \
+ } while (0)
+
+/* log only if a bit is set on the current loglevel mask
+ */
+#define qemu_log_mask(b, ...) do { \
+ if (loglevel & (b)) \
+ fprintf(logfile, ## __VA_ARGS__); \
+ } while (0)
+
+
+
+
+/* Special cases: */
+
+/* cpu_dump_state() logging functions: */
+#define log_cpu_state(env, f) cpu_dump_state((env), logfile, fprintf, (f));
+#define log_cpu_state_mask(b, env, f) do { \
+ if (loglevel & (b)) log_cpu_state((env), (f)); \
+ } while (0)
+
+/* disas() and target_disas() to logfile: */
+#define log_target_disas(start, len, flags) \
+ target_disas(logfile, (start), (len), (flags))
+#define log_disas(start, len) \
+ disas(logfile, (start), (len))
+
+/* page_dump() output to the log file: */
+#define log_page_dump() page_dump(logfile)
+
+
+
+/* Maintenance: */
+
+/* fflush() the log file */
+#define qemu_log_flush() fflush(logfile)
+
+/* Close the log file */
+#define qemu_log_close() do { \
+ fclose(logfile); \
+ logfile = NULL; \
+ } while (0)
+
+/* Set up a new log file */
+#define qemu_log_set_file(f) do { \
+ logfile = (f); \
+ } while (0)
+
+/* Set up a new log file, only if none is set */
+#define qemu_log_try_set_file(f) do { \
+ if (!logfile) \
+ logfile = (f); \
+ } while (0)
+
+
#endif

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