[mirror_lxc.git] / src / lxc / log.c

/*
 * lxc: linux Container library
 *
 * (C) Copyright IBM Corp. 2007, 2008
 *
 * Authors:
 * Cedric Le Goater <legoater@free.fr>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include <stdio.h>
#include <errno.h>
#include <limits.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>

#define __USE_GNU /* for *_CLOEXEC */

#include <fcntl.h>
#include <stdlib.h>

#include "log.h"
#include "caps.h"
#include "utils.h"

#define LXC_LOG_PREFIX_SIZE	32
#define LXC_LOG_BUFFER_SIZE	512

int lxc_log_fd = -1;
static char log_prefix[LXC_LOG_PREFIX_SIZE] = "lxc";
static char *log_fname = NULL;
/* command line values for logfile or logpriority should always override
 * values from the configuration file or defaults
 */
static int lxc_logfile_specified = 0;
static int lxc_loglevel_specified = 0;

lxc_log_define(lxc_log, lxc);

/*---------------------------------------------------------------------------*/
static int log_append_stderr(const struct lxc_log_appender *appender,
			     struct lxc_log_event *event)
{
	if (event->priority < LXC_LOG_PRIORITY_ERROR)
		return 0;

	fprintf(stderr, "%s: ", log_prefix);
	vfprintf(stderr, event->fmt, *event->vap);
	fprintf(stderr, "\n");
	return 0;
}

/*---------------------------------------------------------------------------*/
static int log_append_logfile(const struct lxc_log_appender *appender,
			      struct lxc_log_event *event)
{
	char buffer[LXC_LOG_BUFFER_SIZE];
	int n;

	if (lxc_log_fd == -1)
		return 0;

	n = snprintf(buffer, sizeof(buffer),
		     "%15s %10ld.%03ld %-8s %s - ",
		     log_prefix,
		     event->timestamp.tv_sec,
		     event->timestamp.tv_usec / 1000,
		     lxc_log_priority_to_string(event->priority),
		     event->category);

	n += vsnprintf(buffer + n, sizeof(buffer) - n, event->fmt,
		       *event->vap);

	if (n >= sizeof(buffer) - 1) {
		WARN("truncated next event from %d to %zd bytes", n,
		     sizeof(buffer));
		n = sizeof(buffer) - 1;
	}

	buffer[n] = '\n';

	return write(lxc_log_fd, buffer, n + 1);
}

static struct lxc_log_appender log_appender_stderr = {
	.name		= "stderr",
	.append		= log_append_stderr,
	.next		= NULL,
};

static struct lxc_log_appender log_appender_logfile = {
	.name		= "logfile",
	.append		= log_append_logfile,
	.next		= NULL,
};

static struct lxc_log_category log_root = {
	.name		= "root",
	.priority	= LXC_LOG_PRIORITY_ERROR,
	.appender	= NULL,
	.parent		= NULL,
};

struct lxc_log_category lxc_log_category_lxc = {
	.name		= "lxc",
	.priority	= LXC_LOG_PRIORITY_ERROR,
	.appender	= &log_appender_stderr,
	.parent		= &log_root
};

/*---------------------------------------------------------------------------*/
static int build_dir(const char *name)
{
	char *n = strdup(name);  // because we'll be modifying it
	char *p, *e;
	int ret;

	if (!n) {
		ERROR("Out of memory while creating directory '%s'.", name);
		return -1;
	}

	e = &n[strlen(n)];
	for (p = n+1; p < e; p++) {
		if (*p != '/')
			continue;
		*p = '\0';
		if (access(n, F_OK)) {
			ret = lxc_unpriv(mkdir(n, 0755));
			if (ret && errno != -EEXIST) {
				SYSERROR("failed to create directory '%s'.", n);
				free(n);
				return -1;
			}
		}
		*p = '/';
	}
	free(n);
	return 0;
}

/*---------------------------------------------------------------------------*/
static int log_open(const char *name)
{
	int fd;
	int newfd;

	fd = lxc_unpriv(open(name, O_CREAT | O_WRONLY |
			     O_APPEND | O_CLOEXEC, 0666));
	if (fd == -1) {
		ERROR("failed to open log file \"%s\" : %s", name,
		      strerror(errno));
		return -1;
	}

	if (fd > 2)
		return fd;

	newfd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
	if (newfd == -1)
		ERROR("failed to dup log fd %d : %s", fd, strerror(errno));

	close(fd);
	return newfd;
}

/*
 * Build the path to the log file
 * @name     : the name of the container
 * @lxcpath  : the lxcpath to use as a basename or NULL to use LOGPATH
 * Returns malloced path on sucess, or NULL on failure
 */
static char *build_log_path(const char *name, const char *lxcpath)
{
	char *p;
	int len, ret, use_dir;

#if USE_CONFIGPATH_LOGS
	use_dir = 1;
#else
	use_dir = 0;
#endif

	/*
	 * If USE_CONFIGPATH_LOGS is true or lxcpath is given, the resulting
	 * path will be:
	 * '$logpath' + '/' + '$name' + '/' + '$name' + '.log' + '\0'
	 *
	 * If USE_CONFIGPATH_LOGS is false the resulting path will be:
	 * '$logpath' + '/' + '$name' + '.log' + '\0'
	 */
	len = strlen(name) + 6; /* 6 == '/' + '.log' + '\0' */
	if (lxcpath)
		use_dir = 1;
	else
		lxcpath = LOGPATH;

	if (use_dir)
		len += strlen(lxcpath) + 1 + strlen(name) + 1;  /* add "/$container_name/" */
	else
		len += strlen(lxcpath) + 1;
	p = malloc(len);
	if (!p)
		return p;

	if (use_dir)
		ret = snprintf(p, len, "%s/%s/%s.log", lxcpath, name, name);
	else
		ret = snprintf(p, len, "%s/%s.log", lxcpath, name);

	if (ret < 0 || ret >= len) {
		free(p);
		return NULL;
	}
	return p;
}

/*
 * This can be called:
 *   1. when a program calls lxc_log_init with no logfile parameter (in which
 *      case the default is used).  In this case lxc.logfile can override this.
 *   2. when a program calls lxc_log_init with a logfile parameter.  In this
 *	case we don't want lxc.logfile to override this.
 *   3. When a lxc.logfile entry is found in config file.
 */
static int __lxc_log_set_file(const char *fname, int create_dirs)
{
	if (lxc_log_fd != -1) {
		// we are overriding the default.
		close(lxc_log_fd);
		free(log_fname);
	}

#if USE_CONFIGPATH_LOGS
	// we don't build_dir for the default if the default is
	// i.e. /var/lib/lxc/$container/$container.log
	if (create_dirs)
#endif
	if (build_dir(fname)) {
		ERROR("failed to create dir for log file \"%s\" : %s", fname,
		      strerror(errno));
		return -1;
	}

	lxc_log_fd = log_open(fname);
	if (lxc_log_fd == -1)
		return -1;

	log_fname = strdup(fname);
	return 0;
}

static int _lxc_log_set_file(const char *name, const char *lxcpath, int create_dirs)
{
	char *logfile;
	int ret;

	logfile = build_log_path(name, lxcpath);
	if (!logfile) {
		ERROR("could not build log path");
		return -1;
	}
	ret = __lxc_log_set_file(logfile, create_dirs);
	free(logfile);
	return ret;
}

extern int lxc_log_init(const char *name, const char *file,
			const char *priority, const char *prefix, int quiet,
			const char *lxcpath)
{
	int lxc_priority = LXC_LOG_PRIORITY_ERROR;
	int ret;

	if (lxc_log_fd != -1) {
		WARN("lxc_log_init called with log already initialized");
		return 0;
	}

	if (priority) {
		lxc_loglevel_specified = 1;
		lxc_priority = lxc_log_priority_to_int(priority);

		if (lxc_priority == LXC_LOG_PRIORITY_NOTSET) {
			ERROR("invalid log priority %s", priority);
			return -1;
		}
	}

	lxc_log_category_lxc.priority = lxc_priority;
	lxc_log_category_lxc.appender = &log_appender_logfile;

	if (!quiet)
		lxc_log_category_lxc.appender->next = &log_appender_stderr;

	if (prefix)
		lxc_log_set_prefix(prefix);

	if (file) {
		lxc_logfile_specified = 1;
		if (strcmp(file, "none") == 0)
			return 0;
		ret = __lxc_log_set_file(file, 1);
	} else {
		ret = -1;

		if (!lxcpath)
			lxcpath = LOGPATH;

		/* try LOGPATH if lxcpath is the default */
		if (strcmp(lxcpath, default_lxc_path()) == 0)
			ret = _lxc_log_set_file(name, NULL, 0);

		/* try in lxcpath */
		if (ret < 0)
			ret = _lxc_log_set_file(name, lxcpath, 1);

		/* try LOGPATH in case its writable by the caller */
		if (ret < 0)
			ret = _lxc_log_set_file(name, NULL, 0);
	}

	/*
	 * If !file, that is, if the user did not request this logpath, then
	 * ignore failures and continue logging to console
	 */
	if (!file && ret != 0) {
		INFO("Ignoring failure to open default logfile.");
		ret = 0;
	}

	return ret;
}

/*
 * This is called when we read a lxc.loglevel entry in a lxc.conf file.  This
 * happens after processing command line arguments, which override the .conf
 * settings.  So only set the level if previously unset.
 */
extern int lxc_log_set_level(int level)
{
	if (lxc_loglevel_specified)
		return 0;
	if (level < 0 || level >= LXC_LOG_PRIORITY_NOTSET) {
		ERROR("invalid log priority %d", level);
		return -1;
	}
	lxc_log_category_lxc.priority = level;
	return 0;
}

extern int lxc_log_get_level(void)
{
	if (!lxc_loglevel_specified)
		return LXC_LOG_PRIORITY_NOTSET;
	return lxc_log_category_lxc.priority;
}

extern bool lxc_log_has_valid_level(void)
{
	int log_level = lxc_log_get_level();
	if (log_level < 0 || log_level >= LXC_LOG_PRIORITY_NOTSET)
		return false;
	return true;
}

/*
 * This is called when we read a lxc.logfile entry in a lxc.conf file.  This
 * happens after processing command line arguments, which override the .conf
 * settings.  So only set the file if previously unset.
 */
extern int lxc_log_set_file(const char *fname)
{
	if (lxc_logfile_specified)
		return 0;
	return __lxc_log_set_file(fname, 0);
}

extern const char *lxc_log_get_file(void)
{
	return log_fname;
}

extern void lxc_log_set_prefix(const char *prefix)
{
	strncpy(log_prefix, prefix, sizeof(log_prefix));
	log_prefix[sizeof(log_prefix) - 1] = 0;
}

extern const char *lxc_log_get_prefix(void)
{
	return log_prefix;
}
Commit	Line	Data
e0b4037d DL	1	/*
	2	* lxc: linux Container library
	3	*
	4	* (C) Copyright IBM Corp. 2007, 2008
	5	*
	6	* Authors:
	7	* Cedric Le Goater <legoater@free.fr>
	8	*
	9	* This library is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU Lesser General Public
	11	* License as published by the Free Software Foundation; either
	12	* version 2.1 of the License, or (at your option) any later version.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public
	20	* License along with this library; if not, write to the Free Software
250b1eec	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
e0b4037d	22	*/
0ad19a3f	23	#include <stdio.h>
0ad19a3f	24	#include <errno.h>
cb8c5720 CLG	25	#include <limits.h>
	26	#include <unistd.h>
	27	#include <sys/types.h>
	28	#include <sys/stat.h>
	29	#include <string.h>
	30
	31	#define __USE_GNU /* for _CLOEXEC /
	32
	33	#include <fcntl.h>
	34	#include <stdlib.h>
	35
28f602ff DL	36	#include "log.h"
28f602ff DL	37	#include "caps.h"
ab1bf971	38	#include "utils.h"
cb8c5720	39
6b9f3917 DL	40	#define LXC_LOG_PREFIX_SIZE 32
	41	#define LXC_LOG_BUFFER_SIZE 512
	42
d737c074	43	int lxc_log_fd = -1;
6b9f3917	44	static char log_prefix[LXC_LOG_PREFIX_SIZE] = "lxc";
ab1bf971 DE	45	static char *log_fname = NULL;
	46	/* command line values for logfile or logpriority should always override
	47	* values from the configuration file or defaults
	48	*/
	49	static int lxc_logfile_specified = 0;
9ea87d5d	50	static int lxc_loglevel_specified = 0;
cb8c5720 CLG	51
	52	lxc_log_define(lxc_log, lxc);
	53
d737c074 MN	54	/---------------------------------------------------------------------------/
	55	static int log_append_stderr(const struct lxc_log_appender *appender,
	56	struct lxc_log_event *event)
	57	{
	58	if (event->priority < LXC_LOG_PRIORITY_ERROR)
	59	return 0;
	60
	61	fprintf(stderr, "%s: ", log_prefix);
	62	vfprintf(stderr, event->fmt, *event->vap);
	63	fprintf(stderr, "\n");
	64	return 0;
	65	}
	66
cb8c5720 CLG	67	/---------------------------------------------------------------------------/
cb8c5720 CLG	68	static int log_append_logfile(const struct lxc_log_appender *appender,
5fd8380b	69	struct lxc_log_event *event)
cb8c5720 CLG	70	{
	71	char buffer[LXC_LOG_BUFFER_SIZE];
	72	int n;
	73
	74	if (lxc_log_fd == -1)
	75	return 0;
	76
	77	n = snprintf(buffer, sizeof(buffer),
	78	"%15s %10ld.%03ld %-8s %s - ",
	79	log_prefix,
	80	event->timestamp.tv_sec,
	81	event->timestamp.tv_usec / 1000,
	82	lxc_log_priority_to_string(event->priority),
	83	event->category);
	84
	85	n += vsnprintf(buffer + n, sizeof(buffer) - n, event->fmt,
5fd8380b	86	*event->vap);
cb8c5720 CLG	87
cb8c5720 CLG	88	if (n >= sizeof(buffer) - 1) {
5fd8380b	89	WARN("truncated next event from %d to %zd bytes", n,
cb8c5720 CLG	90	sizeof(buffer));
	91	n = sizeof(buffer) - 1;
	92	}
	93
	94	buffer[n] = '\n';
	95
	96	return write(lxc_log_fd, buffer, n + 1);
	97	}
	98
d737c074 MN	99	static struct lxc_log_appender log_appender_stderr = {
	100	.name = "stderr",
	101	.append = log_append_stderr,
	102	.next = NULL,
	103	};
	104
cb8c5720 CLG	105	static struct lxc_log_appender log_appender_logfile = {
	106	.name = "logfile",
	107	.append = log_append_logfile,
441e4963	108	.next = NULL,
cb8c5720 CLG	109	};
	110
	111	static struct lxc_log_category log_root = {
	112	.name = "root",
	113	.priority = LXC_LOG_PRIORITY_ERROR,
	114	.appender = NULL,
	115	.parent = NULL,
	116	};
	117
	118	struct lxc_log_category lxc_log_category_lxc = {
	119	.name = "lxc",
	120	.priority = LXC_LOG_PRIORITY_ERROR,
25df6b78	121	.appender = &log_appender_stderr,
cb8c5720 CLG	122	.parent = &log_root
	123	};
	124
	125	/---------------------------------------------------------------------------/
5e1e7aaf SH	126	static int build_dir(const char *name)
	127	{
	128	char *n = strdup(name); // because we'll be modifying it
	129	char p, e;
	130	int ret;
	131
	132	if (!n) {
	133	ERROR("Out of memory while creating directory '%s'.", name);
	134	return -1;
	135	}
	136
	137	e = &n[strlen(n)];
	138	for (p = n+1; p < e; p++) {
	139	if (*p != '/')
	140	continue;
	141	*p = '\0';
	142	if (access(n, F_OK)) {
	143	ret = lxc_unpriv(mkdir(n, 0755));
	144	if (ret && errno != -EEXIST) {
	145	SYSERROR("failed to create directory '%s'.", n);
	146	free(n);
	147	return -1;
	148	}
	149	}
	150	*p = '/';
	151	}
	152	free(n);
	153	return 0;
	154	}
	155
cb8c5720 CLG	156	/---------------------------------------------------------------------------/
	157	static int log_open(const char *name)
	158	{
	159	int fd;
	160	int newfd;
	161
28f602ff DL	162	fd = lxc_unpriv(open(name, O_CREAT \| O_WRONLY \|
28f602ff DL	163	O_APPEND \| O_CLOEXEC, 0666));
cb8c5720 CLG	164	if (fd == -1) {
	165	ERROR("failed to open log file \"%s\" : %s", name,
	166	strerror(errno));
	167	return -1;
	168	}
	169
	170	if (fd > 2)
	171	return fd;
	172
	173	newfd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
	174	if (newfd == -1)
	175	ERROR("failed to dup log fd %d : %s", fd, strerror(errno));
	176
	177	close(fd);
	178	return newfd;
	179	}
	180
ab1bf971 DE	181	/*
	182	* Build the path to the log file
	183	* @name : the name of the container
	184	* @lxcpath : the lxcpath to use as a basename or NULL to use LOGPATH
	185	* Returns malloced path on sucess, or NULL on failure
	186	*/
	187	static char build_log_path(const char name, const char *lxcpath)
5e1e7aaf SH	188	{
5e1e7aaf SH	189	char *p;
ee25a44f DE	190	int len, ret, use_dir;
	191
	192	#if USE_CONFIGPATH_LOGS
	193	use_dir = 1;
	194	#else
	195	use_dir = 0;
	196	#endif
5e1e7aaf SH	197
5e1e7aaf SH	198	/*
ee25a44f DE	199	* If USE_CONFIGPATH_LOGS is true or lxcpath is given, the resulting
ee25a44f DE	200	* path will be:
5e1e7aaf	201	* '$logpath' + '/' + '$name' + '/' + '$name' + '.log' + '\0'
ab1bf971 DE	202	*
	203	* If USE_CONFIGPATH_LOGS is false the resulting path will be:
	204	* '$logpath' + '/' + '$name' + '.log' + '\0'
5e1e7aaf	205	*/
ab1bf971	206	len = strlen(name) + 6; /* 6 == '/' + '.log' + '\0' */
ee25a44f DE	207	if (lxcpath)
	208	use_dir = 1;
	209	else
ab1bf971	210	lxcpath = LOGPATH;
ee25a44f DE	211
	212	if (use_dir)
	213	len += strlen(lxcpath) + 1 + strlen(name) + 1; /* add "/$container_name/" */
	214	else
	215	len += strlen(lxcpath) + 1;
5e1e7aaf SH	216	p = malloc(len);
	217	if (!p)
	218	return p;
ee25a44f DE	219
	220	if (use_dir)
	221	ret = snprintf(p, len, "%s/%s/%s.log", lxcpath, name, name);
	222	else
	223	ret = snprintf(p, len, "%s/%s.log", lxcpath, name);
	224
5e1e7aaf SH	225	if (ret < 0 \|\| ret >= len) {
	226	free(p);
	227	return NULL;
	228	}
	229	return p;
	230	}
	231
ab1bf971 DE	232	/*
	233	* This can be called:
	234	* 1. when a program calls lxc_log_init with no logfile parameter (in which
	235	* case the default is used). In this case lxc.logfile can override this.
	236	* 2. when a program calls lxc_log_init with a logfile parameter. In this
	237	* case we don't want lxc.logfile to override this.
	238	* 3. When a lxc.logfile entry is found in config file.
	239	*/
	240	static int __lxc_log_set_file(const char *fname, int create_dirs)
	241	{
	242	if (lxc_log_fd != -1) {
	243	// we are overriding the default.
	244	close(lxc_log_fd);
	245	free(log_fname);
	246	}
	247
	248	#if USE_CONFIGPATH_LOGS
	249	// we don't build_dir for the default if the default is
	250	// i.e. /var/lib/lxc/$container/$container.log
	251	if (create_dirs)
	252	#endif
	253	if (build_dir(fname)) {
	254	ERROR("failed to create dir for log file \"%s\" : %s", fname,
	255	strerror(errno));
	256	return -1;
	257	}
	258
	259	lxc_log_fd = log_open(fname);
	260	if (lxc_log_fd == -1)
	261	return -1;
	262
	263	log_fname = strdup(fname);
	264	return 0;
	265	}
	266
	267	static int _lxc_log_set_file(const char name, const char lxcpath, int create_dirs)
	268	{
	269	char *logfile;
	270	int ret;
	271
	272	logfile = build_log_path(name, lxcpath);
	273	if (!logfile) {
	274	ERROR("could not build log path");
	275	return -1;
	276	}
	277	ret = __lxc_log_set_file(logfile, create_dirs);
	278	free(logfile);
	279	return ret;
	280	}
5e1e7aaf	281
5e1e7aaf	282	extern int lxc_log_init(const char name, const char file,
ab1bf971 DE	283	const char priority, const char prefix, int quiet,
ab1bf971 DE	284	const char *lxcpath)
cb8c5720	285	{
51cab631	286	int lxc_priority = LXC_LOG_PRIORITY_ERROR;
5e1e7aaf	287	int ret;
51cab631	288
ab1bf971 DE	289	if (lxc_log_fd != -1) {
ab1bf971 DE	290	WARN("lxc_log_init called with log already initialized");
2312f31b	291	return 0;
ab1bf971	292	}
2312f31b	293
51cab631	294	if (priority) {
4a85ce2a	295	lxc_loglevel_specified = 1;
51cab631 MN	296	lxc_priority = lxc_log_priority_to_int(priority);
	297
	298	if (lxc_priority == LXC_LOG_PRIORITY_NOTSET) {
	299	ERROR("invalid log priority %s", priority);
	300	return -1;
	301	}
	302	}
	303
	304	lxc_log_category_lxc.priority = lxc_priority;
25df6b78	305	lxc_log_category_lxc.appender = &log_appender_logfile;
cb8c5720	306
441e4963 MN	307	if (!quiet)
	308	lxc_log_category_lxc.appender->next = &log_appender_stderr;
	309
cb8c5720	310	if (prefix)
ab1bf971	311	lxc_log_set_prefix(prefix);
74476cf1	312
ab1bf971 DE	313	if (file) {
	314	lxc_logfile_specified = 1;
	315	if (strcmp(file, "none") == 0)
	316	return 0;
	317	ret = __lxc_log_set_file(file, 1);
5e1e7aaf	318	} else {
ab1bf971 DE	319	ret = -1;
ab1bf971 DE	320
e0b0b533 DE	321	if (!lxcpath)
	322	lxcpath = LOGPATH;
	323
ab1bf971 DE	324	/* try LOGPATH if lxcpath is the default */
	325	if (strcmp(lxcpath, default_lxc_path()) == 0)
	326	ret = _lxc_log_set_file(name, NULL, 0);
5e1e7aaf	327
ab1bf971 DE	328	/* try in lxcpath */
	329	if (ret < 0)
	330	ret = _lxc_log_set_file(name, lxcpath, 1);
	331
	332	/* try LOGPATH in case its writable by the caller */
	333	if (ret < 0)
	334	ret = _lxc_log_set_file(name, NULL, 0);
	335	}
5e1e7aaf	336
5e1e7aaf	337	/*
ab1bf971 DE	338	* If !file, that is, if the user did not request this logpath, then
ab1bf971 DE	339	* ignore failures and continue logging to console
5e1e7aaf	340	*/
ab1bf971	341	if (!file && ret != 0) {
5e1e7aaf SH	342	INFO("Ignoring failure to open default logfile.");
	343	ret = 0;
	344	}
	345
5e1e7aaf	346	return ret;
cb8c5720	347	}
4a85ce2a SH	348
	349	/*
	350	* This is called when we read a lxc.loglevel entry in a lxc.conf file. This
	351	* happens after processing command line arguments, which override the .conf
	352	* settings. So only set the level if previously unset.
	353	*/
	354	extern int lxc_log_set_level(int level)
	355	{
	356	if (lxc_loglevel_specified)
	357	return 0;
	358	if (level < 0 \|\| level >= LXC_LOG_PRIORITY_NOTSET) {
	359	ERROR("invalid log priority %d", level);
	360	return -1;
	361	}
	362	lxc_log_category_lxc.priority = level;
	363	return 0;
	364	}
	365
ab1bf971 DE	366	extern int lxc_log_get_level(void)
	367	{
	368	if (!lxc_loglevel_specified)
	369	return LXC_LOG_PRIORITY_NOTSET;
	370	return lxc_log_category_lxc.priority;
	371	}
	372
fabf7361 QH	373	extern bool lxc_log_has_valid_level(void)
	374	{
	375	int log_level = lxc_log_get_level();
	376	if (log_level < 0 \|\| log_level >= LXC_LOG_PRIORITY_NOTSET)
	377	return false;
	378	return true;
	379	}
	380
4a85ce2a	381	/*
ab1bf971 DE	382	* This is called when we read a lxc.logfile entry in a lxc.conf file. This
	383	* happens after processing command line arguments, which override the .conf
	384	* settings. So only set the file if previously unset.
4a85ce2a	385	*/
ab1bf971	386	extern int lxc_log_set_file(const char *fname)
4a85ce2a	387	{
ab1bf971	388	if (lxc_logfile_specified)
5e1e7aaf	389	return 0;
ab1bf971	390	return __lxc_log_set_file(fname, 0);
4a85ce2a	391	}
9ea87d5d	392
ab1bf971	393	extern const char *lxc_log_get_file(void)
5e1e7aaf	394	{
ab1bf971	395	return log_fname;
5e1e7aaf SH	396	}
5e1e7aaf SH	397
ab1bf971	398	extern void lxc_log_set_prefix(const char *prefix)
9ea87d5d	399	{
ab1bf971 DE	400	strncpy(log_prefix, prefix, sizeof(log_prefix));
ab1bf971 DE	401	log_prefix[sizeof(log_prefix) - 1] = 0;
9ea87d5d SH	402	}
9ea87d5d SH	403
ab1bf971	404	extern const char *lxc_log_get_prefix(void)
9ea87d5d	405	{
ab1bf971	406	return log_prefix;
9ea87d5d	407	}