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	dmesg.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	dmesg.c (1325B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/klog.h>
	3
	4 #include <stdio.h>
	5 #include <stdlib.h>
	6 #include <string.h>
	7 #include <unistd.h>
	8
	9 #include "util.h"
	10
	11 enum {
	12 SYSLOG_ACTION_READ_ALL = 3,
	13 SYSLOG_ACTION_CLEAR = 5,
	14 SYSLOG_ACTION_CONSOLE_LEVEL = 8,
	15 SYSLOG_ACTION_SIZE_BUFFER = 10
	16 };
	17
	18 static void
	19 dmesg_show(const void *buf, size_t n)
	20 {
	21 const char *p = buf;
	22 ssize_t r;
	23
	24 r = write(1, p, n);
	25 if (r < 0)
	26 eprintf("write:");
	27 if (r > 0 && p[r - 1] != '\n')
	28 putchar('\n');
	29 }
	30
	31 static void
	32 usage(void)
	33 {
	34 eprintf("usage: %s [-Ccr] [-n level]\n", argv0);
	35 }
	36
	37 int
	38 main(int argc, char *argv[])
	39 {
	40 int n;
	41 char *buf;
	42 int cflag = 0;
	43 long level;
	44
	45 ARGBEGIN {
	46 case 'C':
	47 if (klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
	48 eprintf("klogctl:");
	49 return 0;
	50 case 'c':
	51 cflag = 1;
	52 break;
	53 case 'r':
	54 break;
	55 case 'n':
	56 level = estrtol(EARGF(usage()), 10);
	57 if (klogctl(SYSLOG_ACTION_CONSOLE_LEVEL, NULL, level) < …
	58 eprintf("klogctl:");
	59 return 0;
	60 default:
	61 usage();
	62 } ARGEND;
	63
	64 n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0);
	65 if (n < 0)
	66 eprintf("klogctl:");
	67
	68 buf = emalloc(n);
	69
	70 n = klogctl(SYSLOG_ACTION_READ_ALL, buf, n);
	71 if (n < 0)
	72 eprintf("klogctl:");
	73
	74 dmesg_show(buf, n);
	75
	76 if (cflag && klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
	77 eprintf("klogctl:");
	78
	79 free(buf);
	80 return 0;
	81