/* vi: set sw=4 ts=4: */
/*
- *
+ *
* dmesg - display/control kernel ring buffer.
*
- * Copyring 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-#include "busybox.h"
-#include <unistd.h>
+//usage:#define dmesg_trivial_usage
+//usage: "[-c] [-n LEVEL] [-s SIZE]"
+//usage:#define dmesg_full_usage "\n\n"
+//usage: "Print or control the kernel ring buffer\n"
+//usage: "\n -c Clear ring buffer after printing"
+//usage: "\n -n LEVEL Set console logging level"
+//usage: "\n -s SIZE Buffer size"
+//usage: "\n -r Print raw message buffer"
+
#include <sys/klog.h>
+#include "libbb.h"
-int dmesg_main(int argc, char *argv[])
+int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int dmesg_main(int argc UNUSED_PARAM, char **argv)
{
- char *size, *level;
- int flags = bb_getopt_ulflags(argc, argv, "cs:n:", &size, &level);
+ int len, level;
+ char *buf;
+ unsigned opts;
+ enum {
+ OPT_c = 1 << 0,
+ OPT_s = 1 << 1,
+ OPT_n = 1 << 2,
+ OPT_r = 1 << 3
+ };
- if (flags & 4) {
- if (klogctl(8, NULL, bb_xgetlarg(level, 10, 0, 10)))
+ opt_complementary = "s+:n+"; /* numeric */
+ opts = getopt32(argv, "cs:n:r", &len, &level);
+ if (opts & OPT_n) {
+ if (klogctl(8, NULL, (long) level))
bb_perror_msg_and_die("klogctl");
- } else {
- int len;
- char *buf;
+ return EXIT_SUCCESS;
+ }
- len = (flags & 2) ? bb_xgetlarg(size, 10, 2, INT_MAX) : 16384;
- buf = xmalloc(len);
- if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
- bb_perror_msg_and_die("klogctl");
- write(1,buf,len);
- if (len && buf[len-1]!='\n') putchar('\n');
+ if (!(opts & OPT_s))
+ len = klogctl(10, NULL, 0); /* read ring buffer size */
+ if (len < 16*1024)
+ len = 16*1024;
+ if (len > 16*1024*1024)
+ len = 16*1024*1024;
+
+ buf = xmalloc(len);
+ len = klogctl(3 + (opts & OPT_c), buf, len); /* read ring buffer */
+ if (len < 0)
+ bb_perror_msg_and_die("klogctl");
+ if (len == 0)
+ return EXIT_SUCCESS;
+
+
+ if (ENABLE_FEATURE_DMESG_PRETTY && !(opts & OPT_r)) {
+ int last = '\n';
+ int in = 0;
+
+ /* Skip <[0-9]+> at the start of lines */
+ while (1) {
+ if (last == '\n' && buf[in] == '<') {
+ while (buf[in++] != '>' && in < len)
+ ;
+ } else {
+ last = buf[in++];
+ putchar(last);
+ }
+ if (in >= len)
+ break;
+ }
+ /* Make sure we end with a newline */
+ if (last != '\n')
+ bb_putchar('\n');
+ } else {
+ full_write(STDOUT_FILENO, buf, len);
+ if (buf[len-1] != '\n')
+ bb_putchar('\n');
}
- return 0;
+ if (ENABLE_FEATURE_CLEAN_UP) free(buf);
+
+ return EXIT_SUCCESS;
}