From 930ce6e142354268d11ec9fe5cf6f4fc66a8f1f0 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Tue, 30 Sep 2014 10:26:20 +0200 Subject: Introduce message logging support This adds a buffer for log messages and a 'dmesg' command to print the messages. The log buffer is implemented as log objects rather than a string buffer. This makes it easy to implement limiting the messages, cleaning the buffer and timestamping the messages. Signed-off-by: Sascha Hauer --- commands/dmesg.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 commands/dmesg.c (limited to 'commands/dmesg.c') diff --git a/commands/dmesg.c b/commands/dmesg.c new file mode 100644 index 0000000000..b2bb334e24 --- /dev/null +++ b/commands/dmesg.c @@ -0,0 +1,100 @@ +/* + * dmesg.c - barebox logbuffer handling + * + * Copyright (c) 2014 Sascha Hauer , Pengutronix + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include +#include +#include +#include +#include +#include +#include + +static int do_dmesg(int argc, char *argv[]) +{ + int opt, i; + int delete_buf = 0, emit = 0; + unsigned flags = 0; + + while ((opt = getopt(argc, argv, "ctde")) > 0) { + switch (opt) { + case 'c': + delete_buf = 1; + break; + case 't': + flags |= BAREBOX_LOG_PRINT_TIME; + break; + case 'd': + flags |= BAREBOX_LOG_DIFF_TIME; + break; + case 'e': + emit = 1; + break; + default: + return COMMAND_ERROR_USAGE; + } + } + + if (emit) { + char *buf; + int len = 0; + + for (i = optind; i < argc; i++) + len += strlen(argv[i]) + 1; + + buf = malloc(len + 2); + if (!buf) + return -ENOMEM; + + len = 0; + + for (i = optind; i < argc; i++) + len += sprintf(buf + len, "%s ", argv[i]); + + *(buf + len) = '\n'; + *(buf + len + 1) = 0; + + pr_info(buf); + + free(buf); + + return 0; + } + + log_print(flags); + + if (delete_buf) + log_clean(10); + + return 0; +} + +BAREBOX_CMD_HELP_START(dmesg) +BAREBOX_CMD_HELP_TEXT("Options:") +BAREBOX_CMD_HELP_OPT ("-c", "Delete messages after printing them") +BAREBOX_CMD_HELP_OPT ("-d", "Show a time delta to the last message") +BAREBOX_CMD_HELP_OPT ("-e ", "Emit a log message") +BAREBOX_CMD_HELP_OPT ("-t", "Show timestamp informations") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(dmesg) + .cmd = do_dmesg, + BAREBOX_CMD_DESC("Print or control log messages") + BAREBOX_CMD_OPTS("[-cdet]") + BAREBOX_CMD_GROUP(CMD_GRP_INFO) + BAREBOX_CMD_HELP(cmd_dmesg_help) +BAREBOX_CMD_END -- cgit v1.2.3