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110 lines
3.0 KiB
110 lines
3.0 KiB
4 months ago
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/* klogd.c - Klogd, The kernel log Dameon.
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*
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* Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
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* Copyright 2013 Kyungwan Han <asura321@gmail.com>
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*
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* No standard
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USE_KLOGD(NEWTOY(klogd, "c#<1>8n", TOYFLAG_SBIN))
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config KLOGD
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bool "klogd"
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default n
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help
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usage: klogd [-n] [-c N]
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-c N Print to console messages more urgent than prio N (1-8)"
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-n Run in foreground
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config KLOGD_SOURCE_RING_BUFFER
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bool "enable kernel ring buffer as log source."
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default n
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depends on KLOGD
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*/
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#define FOR_klogd
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#include "toys.h"
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#include <signal.h>
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#include <sys/klog.h>
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GLOBALS(
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long level;
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int fd;
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)
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static void set_log_level(int level)
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{
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if (CFG_KLOGD_SOURCE_RING_BUFFER)
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klogctl(8, NULL, level);
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else {
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FILE *fptr = xfopen("/proc/sys/kernel/printk", "w");
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fprintf(fptr, "%u\n", level);
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fclose(fptr);
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fptr = NULL;
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}
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}
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static void handle_signal(int sig)
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{
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if (CFG_KLOGD_SOURCE_RING_BUFFER) {
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klogctl(7, NULL, 0);
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klogctl(0, NULL, 0);
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} else {
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set_log_level(7);
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xclose(TT.fd);
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}
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syslog(LOG_NOTICE,"KLOGD: Daemon exiting......");
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exit(1);
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}
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/*
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* Read kernel ring buffer in local buff and keep track of
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* "used" amount to track next read to start.
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*/
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void klogd_main(void)
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{
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int prio, size, used = 0;
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char *start, *line_start, msg_buffer[16348]; //LOG_LINE_LENGTH - Ring buffer size
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sigatexit(handle_signal);
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if (toys.optflags & FLAG_c) set_log_level(TT.level); //set log level
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if (!(toys.optflags & FLAG_n)) daemon(0, 0); //Make it daemon
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if (CFG_KLOGD_SOURCE_RING_BUFFER) {
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syslog(LOG_NOTICE, "KLOGD: started with Kernel ring buffer as log source\n");
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klogctl(1, NULL, 0);
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} else {
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TT.fd = xopenro("/proc/kmsg"); //_PATH_KLOG in paths.h
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syslog(LOG_NOTICE, "KLOGD: started with /proc/kmsg as log source\n");
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}
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openlog("Kernel", 0, LOG_KERN); //open connection to system logger..
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while(1) {
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start = msg_buffer + used; //start updated for re-read.
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if (CFG_KLOGD_SOURCE_RING_BUFFER) {
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size = klogctl(2, start, sizeof(msg_buffer) - used - 1);
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} else {
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size = xread(TT.fd, start, sizeof(msg_buffer) - used - 1);
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}
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if (size < 0) perror_exit("error reading file:");
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start[size] = '\0'; //Ensure last line to be NUL terminated.
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if (used) start = msg_buffer;
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while(start) {
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if ((line_start = strsep(&start, "\n")) != NULL && start != NULL) used = 0;
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else { //Incomplete line, copy it to start of buff.
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used = strlen(line_start);
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strcpy(msg_buffer, line_start);
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if (used < (sizeof(msg_buffer) - 1)) break;
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used = 0; //we have buffer full, log it as it is.
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}
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prio = LOG_INFO; //we dont know priority, mark it INFO
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if (*line_start == '<') { //we have new line to syslog
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line_start++;
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if (line_start) prio = (int)strtoul(line_start, &line_start, 10);
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if (*line_start == '>') line_start++;
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}
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if (*line_start) syslog(prio, "%s", line_start);
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}
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}
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}
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