68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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*
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* dmesg - display/control kernel ring buffer.
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*
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* Copyright 2006 Rob Landley <rob@landley.net>
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* Copyright 2006 Bernhard Fischer <rep.nop@aon.at>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <sys/klog.h>
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#include "libbb.h"
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int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int dmesg_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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int len;
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char *buf;
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char *size, *level;
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unsigned flags = getopt32(argv, "cs:n:", &size, &level);
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enum {
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OPT_c = 1<<0,
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OPT_s = 1<<1,
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OPT_n = 1<<2
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};
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if (flags & OPT_n) {
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if (klogctl(8, NULL, xatoul_range(level, 0, 10)))
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bb_perror_msg_and_die("klogctl");
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return EXIT_SUCCESS;
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}
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len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384;
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buf = xmalloc(len);
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len = klogctl(3 + (flags & OPT_c), buf, len);
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if (len < 0)
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bb_perror_msg_and_die("klogctl");
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if (len == 0)
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return EXIT_SUCCESS;
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/* Skip <#> at the start of lines, and make sure we end with a newline. */
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if (ENABLE_FEATURE_DMESG_PRETTY) {
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int last = '\n';
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int in = 0;
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do {
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if (last == '\n' && buf[in] == '<')
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in += 3;
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else {
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last = buf[in++];
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bb_putchar(last);
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}
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} while (in < len);
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if (last != '\n')
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bb_putchar('\n');
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} else {
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full_write(STDOUT_FILENO, buf, len);
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if (buf[len-1] != '\n')
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bb_putchar('\n');
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}
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if (ENABLE_FEATURE_CLEAN_UP) free(buf);
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return EXIT_SUCCESS;
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}
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