finit/src/log.c at master · finit-project/finit · GitHub

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/* Finit daemon log functions

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

#include "config.h" /* Generated by configure script */

#include <stdio.h>

#include <stdarg.h>

#include <time.h>

#ifdef _LIBITE_LITE

# include <libite/lite.h>

#else

# include <lite/lite.h>

#endif

#define SYSLOG_NAMES

#include <syslog.h>

#include "finit.h"

#include "helpers.h"

#include "log.h"

#include "util.h"

static int up = 0;

static int loglevel = LOG_INFO;

void log_init(void)

{

if (debug)

loglevel = LOG_DEBUG;

else

loglevel = LOG_INFO;

}

/* If we enabled terse mode at boot, restore to previous setting at shutdown */

void log_exit(void)

{

enable_progress(1);

}

static int log_open(void)

{

int opts;

if (up)

return 1;

if (access("/dev/log", W_OK))

return 0;

opts = LOG_CONS | LOG_PID;

if (debug)

opts |= LOG_PERROR;

openlog("finit", opts, LOG_DAEMON);

setlogmask(LOG_UPTO(loglevel));

return up = 1;

}

static void log_close(void)

{

closelog();

up = 0;

}

/* Toggle debug mode */

void log_debug(void)

{

debug = !debug;

log_close();

log_init();

log_open();

logit(LOG_NOTICE, "Debug mode %s", debug ? "enabled" : "disabled");

}

static const char *l2s(int prio)

{

int level = prio & ~LOG_CONSOLE;

switch (level) {

case LOG_ERR: return "ERR";

case LOG_WARNING: return "WRN";

case LOG_NOTICE: return "NOT";

case LOG_INFO: return "NFO";

case LOG_DEBUG: return "DBG";

default: break;

}

return "UNK";

}

static int s2f(const char *str)

{

for (int i = 0; facilitynames[i].c_name; i++) {

if (string_match(facilitynames[i].c_name, str))

return facilitynames[i].c_val;

}

return -1;

}

static int s2l(const char *str)

{

for (int i = 0; prioritynames[i].c_name; i++) {

if (string_match(prioritynames[i].c_name, str))

return prioritynames[i].c_val;

}

return -1;

}

* Parse syslog facility.priority strings into their numerical values

* using arrays defined in <syslog.h>. Note, the 'prio' argument may

* be one of:

* - facility.level

* - facility

* - level

* It is up to the callee to assign defaults to 'facility' and 'level'

* before calling this function. If There is any match the respective

* facility or level will be assigned and this function returns OK.

int log_parse(char *prio, int *facility, int *level)

{

char *fac = prio, *lvl;

int f = -1;

int l = -1;

if (!prio || !facility || !level)

return -1;

lvl = strchr(prio, '.');

if (lvl) {

*lvl = 0;

lvl++;

}

if (lvl && *lvl)

l = s2l(lvl);

f = s2f(fac);

if (l < 0)

l = s2l(fac);

if (l < 0 && f <= 0)

return -1;

if (l <= LOG_DEBUG)

*level = l;

if (f <= LOG_LOCAL7)

*facility = f;

return 0;

}

* Log to /dev/kmsg until syslogd has started, then openlog()

* and continue logging as a regular daemon.

void logit(int prio, const char *fmt, ...)

{

va_list ap;

FILE *fp;

va_start(ap, fmt);

if (up || log_open()) {

vsyslog(prio, fmt, ap);

goto done;

}

if (LOG_PRI(prio) > loglevel)

goto done;

if (in_container() || !(fp = fopen("/dev/kmsg", "w"))) {

static char buf[512];

time_t now;

size_t pos;

now = time(NULL);

pos = (int)strftime(buf, sizeof(buf), "%FT%T", localtime(&now));

pos += snprintf(&buf[pos], sizeof(buf) - pos, " [%s]: ", l2s(prio));

vsnprintf(&buf[pos], sizeof(buf) - pos, fmt, ap);

strlcat(buf, "\n", sizeof(buf));

fputs(buf, stderr);

goto done;

}

fprintf(fp, "<%d>finit[1]: ", LOG_DAEMON | prio);

vfprintf(fp, fmt, ap);

fclose(fp);

if (debug) {

va_end(ap);

va_start(ap, fmt);

vfprintf(stderr, fmt, ap);

fputs("\n", stderr);

}

done:

va_end(ap);

}

* Log to file, intended for debug only.

void flog(char *file, const char *fmt, ...)

{

char fn[80];

va_list ap;

FILE *fp;

snprintf(fn, sizeof(fn), "/tmp/%s.log", file);

fp = fopen(fn, "a");

if (!fp)

return;

va_start(ap, fmt);

vfprintf(fp, fmt, ap);

va_end(ap);

fclose(fp);

}

/**

* Local Variables:

* indent-tabs-mode: t

* c-file-style: "linux"

* End:

finit/src/log.c at master · finit-project/finit · GitHub

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