Scale Stack 0.3 Developer Documentation

scalestack/kernel/log_console.cc

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/*
 * Scale Stack
 *
 * Copyright 2010 Eric Day
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "config.h"

#include <cerrno>
#include <cstdio>
#include <cstring>
#include <unistd.h>

#include <scalestack/kernel/log_console.h>

namespace scalestack
{
namespace kernel
{

/*
 * Public methods.
 */

log_console::log_console()
{
}

void log_console::write_log(log::level log_level,
                            const char* context,
                            const char* message)
{
  /* Another buffer is used here so we can have one atomic write to stdout. */
  char buffer[SCALESTACK_MAX_MESSAGE_SIZE];
  int size = snprintf(buffer, SCALESTACK_MAX_MESSAGE_SIZE, "%6s [%s] %s\n",
                      log::level_name(log_level), context, message);
  buffer[SCALESTACK_MAX_MESSAGE_SIZE - 1] = '\n';
  if (size > SCALESTACK_MAX_MESSAGE_SIZE)
    size = SCALESTACK_MAX_MESSAGE_SIZE;
  if (write(1, buffer, size) == -1 && errno != EPIPE && errno != EINTR)
    fprintf(stderr, _("Failed console write: %s:%d\n"), strerror(errno), errno);
}

} /* namespace kernel */
} /* namespace scalestack */

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