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authorSascha Hauer <s.hauer@pengutronix.de>2014-09-30 10:26:20 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2014-09-30 15:33:22 +0200
commit930ce6e142354268d11ec9fe5cf6f4fc66a8f1f0 (patch)
treed924b3a215a8dac31e35c1e83ebf3440545d353e /commands/dmesg.c
parent6ae9a40c799dd341db985c95cc906ae2e0aacf97 (diff)
downloadbarebox-930ce6e142354268d11ec9fe5cf6f4fc66a8f1f0.tar.gz
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 <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/dmesg.c')
-rw-r--r--commands/dmesg.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/commands/dmesg.c b/commands/dmesg.c
new file mode 100644
index 0000000..b2bb334
--- /dev/null
+++ b/commands/dmesg.c
@@ -0,0 +1,100 @@
+/*
+ * dmesg.c - barebox logbuffer handling
+ *
+ * Copyright (c) 2014 Sascha Hauer <s.hauer@pengutronix.de>, 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 <common.h>
+#include <malloc.h>
+#include <command.h>
+#include <globalvar.h>
+#include <environment.h>
+#include <getopt.h>
+#include <clock.h>
+
+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 <msg>", "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