ubase/dmesg.c

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C
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/* See LICENSE file for copyright and license details. */
#include <sys/klog.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
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#include "util.h"
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static void dmesg_show(int fd, const void *buf, size_t n);
enum {
SYSLOG_ACTION_READ_ALL = 3,
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SYSLOG_ACTION_CLEAR = 5,
SYSLOG_ACTION_CONSOLE_LEVEL = 8,
SYSLOG_ACTION_SIZE_BUFFER = 10
};
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static void
usage(void)
{
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eprintf("usage: [-Ccr] [-n level] %s\n", argv0);
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}
int
main(int argc, char *argv[])
{
int n;
char *buf;
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int cflag = 0;
long level;
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ARGBEGIN {
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case 'C':
if (klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
eprintf("klogctl:");
return EXIT_SUCCESS;
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case 'c':
cflag = 1;
break;
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case 'r':
break;
case 'n':
level = estrtol(EARGF(usage()), 10);
if (klogctl(SYSLOG_ACTION_CONSOLE_LEVEL, NULL, level) < 0)
eprintf("klogctl:");
return EXIT_SUCCESS;
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default:
usage();
} ARGEND;
n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0);
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if (n < 0)
eprintf("klogctl:");
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buf = emalloc(n);
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n = klogctl(SYSLOG_ACTION_READ_ALL, buf, n);
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if (n < 0)
eprintf("klogctl:");
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dmesg_show(STDOUT_FILENO, buf, n);
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if (cflag && klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
eprintf("klogctl:");
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free(buf);
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return EXIT_SUCCESS;
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}
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static void
dmesg_show(int fd, const void *buf, size_t n)
{
const char *p = buf;
ssize_t r;
r = write(fd, p, n);
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if (r < 0)
eprintf("write:");
if (r > 0 && p[r - 1] != '\n')
putchar('\n');
}