diff options
Diffstat (limited to 'util-linux/dmesg.c')
-rw-r--r-- | util-linux/dmesg.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c new file mode 100644 index 0000000..f52026c --- /dev/null +++ b/util-linux/dmesg.c @@ -0,0 +1,67 @@ +/* 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 tarball for details. + */ + +#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; + char *buf; + char *size, *level; + unsigned flags = getopt32(argv, "cs:n:", &size, &level); + enum { + OPT_c = 1<<0, + OPT_s = 1<<1, + OPT_n = 1<<2 + }; + + if (flags & OPT_n) { + if (klogctl(8, NULL, xatoul_range(level, 0, 10))) + bb_perror_msg_and_die("klogctl"); + return EXIT_SUCCESS; + } + + len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384; + buf = xmalloc(len); + len = klogctl(3 + (flags & OPT_c), buf, len); + if (len < 0) + bb_perror_msg_and_die("klogctl"); + if (len == 0) + return EXIT_SUCCESS; + + /* Skip <#> at the start of lines, and make sure we end with a newline. */ + + if (ENABLE_FEATURE_DMESG_PRETTY) { + int last = '\n'; + int in = 0; + + do { + if (last == '\n' && buf[in] == '<') + in += 3; + else { + last = buf[in++]; + bb_putchar(last); + } + } while (in < len); + 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; +} |