92 lines
1.5 KiB
C
92 lines
1.5 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/klog.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "grabmntinfo.h"
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#include "util.h"
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static int dmesg_show(int fd, const void *buf, size_t n);
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enum {
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SYSLOG_ACTION_READ_ALL = 3,
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SYSLOG_ACTION_CLEAR = 5,
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SYSLOG_ACTION_SIZE_BUFFER = 10
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};
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static void
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usage(void)
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{
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eprintf("usage: [-Cc] %s\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int n;
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char *buf;
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int cflag = 0;
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ARGBEGIN {
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case 'C':
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if (klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
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eprintf("klogctl:");
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return 0;
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case 'c':
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cflag = 1;
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break;
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default:
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usage();
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} ARGEND;
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n = klogctl(SYSLOG_ACTION_SIZE_BUFFER, NULL, 0);
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if (n < 0)
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eprintf("klogctl:");
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buf = malloc(n);
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if (!buf)
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eprintf("malloc:");
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n = klogctl(SYSLOG_ACTION_READ_ALL, buf, n);
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if (n < 0)
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eprintf("klogctl:");
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n = dmesg_show(STDOUT_FILENO, buf, n);
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if (n < 0)
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eprintf("dmesg_show:");
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if (cflag && klogctl(SYSLOG_ACTION_CLEAR, NULL, 0) < 0)
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eprintf("klogctl:");
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free(buf);
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return 0;
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}
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static int
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dmesg_show(int fd, const void *buf, size_t n)
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{
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int last = '\n';
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char newbuf[n], *q = newbuf;
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const char *p = buf;
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size_t i;
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memset(newbuf, 0, n);
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for (i = 0; i < n; ) {
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if (last == '\n' && p[i] == '<') {
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i += 2;
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if (i + 1 < n && p[i + 1] == '>')
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i++;
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} else {
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*q++ = p[i];
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}
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last = p[i++];
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}
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if (write(fd, newbuf, n) != n)
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return -1;
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if (last != '\n')
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if (write(fd, "\n", 1) != 1)
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return -1;
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return 0;
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}
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