| /* vi: set sw=4 ts=4: */ |
| /* |
| * |
| * dmesg - display/control kernel ring buffer. |
| * |
| * Copyright 2006 Rob Landley <rob@landley.net> |
| * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| #include <sys/klog.h> |
| #include "libbb.h" |
| |
| int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int dmesg_main(int argc UNUSED_PARAM, char **argv) |
| { |
| int len, level; |
| char *buf; |
| unsigned opts; |
| enum { |
| OPT_c = 1 << 0, |
| OPT_s = 1 << 1, |
| OPT_n = 1 << 2 |
| }; |
| |
| opt_complementary = "s+:n+"; /* numeric */ |
| opts = getopt32(argv, "cs:n:", &len, &level); |
| if (opts & OPT_n) { |
| if (klogctl(8, NULL, (long) level)) |
| bb_perror_msg_and_die("klogctl"); |
| return EXIT_SUCCESS; |
| } |
| |
| 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) { |
| int last = '\n'; |
| int in = 0; |
| |
| /* Skip <#> at the start of lines */ |
| while (1) { |
| if (last == '\n' && buf[in] == '<') { |
| in += 3; |
| if (in >= len) |
| break; |
| } |
| last = buf[in]; |
| putchar(last); |
| in++; |
| 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'); |
| } |
| |
| if (ENABLE_FEATURE_CLEAN_UP) free(buf); |
| |
| return EXIT_SUCCESS; |
| } |