/**************************************************************************** * drivers/syslog/syslog_write.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 #include #include #include #include #include "syslog.h" /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: syslog_default_write * * Description: * This provides a default write method for syslog devices that do not * support multiple byte writes This functions simply loops, outputting * one character at a time. * * Input Parameters: * buffer - The buffer containing the data to be output * buflen - The number of bytes in the buffer * * Returned Value: * On success, the number of characters written is returned. A negated * errno value is returned on any failure. * ****************************************************************************/ static ssize_t syslog_default_write(FAR const char *buffer, size_t buflen) { int i; size_t nwritten = 0; if (up_interrupt_context() || sched_idletask()) { for (nwritten = 0; nwritten < buflen; nwritten++) { #ifdef CONFIG_SYSLOG_INTBUFFER if (up_interrupt_context()) { syslog_add_intbuffer(*buffer++); } else #endif { for (i = 0; i < CONFIG_SYSLOG_MAX_CHANNELS; i++) { if (g_syslog_channel[i] == NULL) { break; } DEBUGASSERT(g_syslog_channel[i]->sc_ops->sc_force != NULL); g_syslog_channel[i]->sc_ops->sc_force(g_syslog_channel[i], *buffer++); } } } } else { for (i = 0; i < CONFIG_SYSLOG_MAX_CHANNELS; i++) { if (g_syslog_channel[i] == NULL) { break; } if (g_syslog_channel[i]->sc_ops->sc_write) { nwritten = g_syslog_channel[i]->sc_ops->sc_write(g_syslog_channel[i], buffer, buflen); } else { DEBUGASSERT(g_syslog_channel[i]->sc_ops->sc_putc != NULL); for (nwritten = 0; nwritten < buflen; nwritten++) { g_syslog_channel[i]->sc_ops->sc_putc(g_syslog_channel[i], *buffer++); } } } } return nwritten; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: syslog_write * * Description: * This is the low-level, multiple character, system logging interface. * * Input Parameters: * buffer - The buffer containing the data to be output * buflen - The number of bytes in the buffer * * Returned Value: * On success, the number of characters written is returned. A negated * errno value is returned on any failure. * ****************************************************************************/ ssize_t syslog_write(FAR const char *buffer, size_t buflen) { #ifdef CONFIG_SYSLOG_INTBUFFER if (!up_interrupt_context() && !sched_idletask()) { /* Flush any characters that may have been added to the interrupt * buffer. */ syslog_flush_intbuffer(false); } #endif return syslog_default_write(buffer, buflen); }