Logging infrastructure.

1 files changed, 82 insertions, 0 deletions

diff --git a/logging.c b/logging.c
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+/*
+ * logging.c
+ * ---------
+ * Default (stdio-based) logging code for libhal.
+ *
+ * Copyright (c) 2017, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "hal.h"
+#include "hal_internal.h"
+
+/*
+ * Default stdio-based logging code.  Specific environments may supply
+ * something more appropriate (eg, on the Alpha, we want to log to the
+ * management port).
+ *
+ * See lock.c for comments on GNU weak functions.
+ */
+
+#ifndef ENABLE_WEAK_FUNCTIONS
+#define ENABLE_WEAK_FUNCTIONS 0
+#endif
+
+#if ENABLE_WEAK_FUNCTIONS
+#define WEAK_FUNCTION __attribute__((weak))
+#else
+#define WEAK_FUNCTION
+#endif
+
+static hal_log_level_t current_level;
+
+WEAK_FUNCTION void hal_log_set_level(const hal_log_level_t level)
+{
+  current_level = level;
+}
+
+WEAK_FUNCTION void hal_log(const hal_log_level_t level, const char *format, ...)
+{
+  if (level < current_level)
+    return;
+
+  va_list ap;
+  va_start(ap, format);
+  vfnprintf(stderr, format, ap);
+  va_end(ap);
+  fprintf(stderr, "\n");
+}
+
+/*
+ * Local variables:
+ * indent-tabs-mode: nil
+ * End:
+ */