/**************************************************************************** * drivers/syslog/syslog_flush.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include <nuttx/config.h> #include <stdbool.h> #include <assert.h> #include <nuttx/syslog/syslog.h> #include "syslog.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: syslog_flush * * Description: * This is called by system crash-handling logic. It must flush any * buffered data to the SYSLOG device. * * Interrupts are disabled at the time of the crash and this logic must * perform the flush using low-level, non-interrupt driven logic. * * REVISIT: There is an implementation problem in that if a character * driver is the underlying device, then there is no mechanism to flush * the data buffered in the driver with interrupts disabled. * * Currently, this function on (a) dumps the interrupt buffer (if the * SYSLOG interrupt buffer is enabled), and (b) only the SYSLOG interface * supports supports the 'sc_force()' method. * * Input Parameters: * ch - The character to add to the SYSLOG (must be positive). * * Returned Value: * Zero (OK)is returned on success. A negated errno value is returned * on any failure. * ****************************************************************************/ int syslog_flush(void) { int i; #ifdef CONFIG_SYSLOG_INTBUFFER /* Flush any characters that may have been added to the interrupt * buffer. */ syslog_flush_intbuffer(true); #endif for (i = 0; i < CONFIG_SYSLOG_MAX_CHANNELS; i++) { if (g_syslog_channel[i] == NULL) { break; } /* Then flush all of the buffered output to the SYSLOG device */ if (g_syslog_channel[i]->sc_ops->sc_flush != NULL) { g_syslog_channel[i]->sc_ops->sc_flush(g_syslog_channel[i]); } } return OK; }