trunk/grubby/log.c

/*
 * log.c
 *
 * Copyright 2013 Red Hat, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>

#include "log.h"

static int log_fd = -1;
static FILE *f = NULL;

static int
open_log(void)
{
	if (log_fd > -1)
		return 0;
	log_fd = open("/var/log/grubby", O_RDWR|O_APPEND|O_CREAT|O_CLOEXEC, 0600);
	if (log_fd < 0)
		return log_fd;

	f = fdopen(log_fd, "a+");
	if (f == NULL) {
		typeof(errno) saved_errno = errno;
		close(log_fd);
		log_fd = -1;
		errno = saved_errno;
		return -1;
	}

	setbuf(f, NULL);
	return 0;
}

int
log_time(FILE *log)
{
	if (!log) {
		int rc = open_log();
		if (rc < 0)
			return rc;
	}

	time_t t = time(NULL);
	char timestr[27];

	ctime_r(&t, timestr);
	timestr[26] = '\0';
	for (int i = 26; i >= 0; i--)
		if (timestr[i] == '\n')
			timestr[i] = '\0';

	return log_message(log, "DBG: %d: %s: ", getpid(), timestr);
}

int
log_vmessage(FILE *log, const char *msg, va_list ap)
{
	int rc;

	if (!msg)
		return -1;
	if (msg[0] == '\0')
		return 0;

	if (!log) {
		rc = open_log();
		if (rc < 0)
			return rc;
	}

	va_list aq;
	va_copy(aq, ap);

	vfprintf(log ? log : f, msg, aq);
	va_end(aq);
	fdatasync(log ? fileno(log) : log_fd);

	return 0;
}

int
log_message(FILE *log, const char *msg, ...)
{
	va_list argp;

	va_start(argp, msg);
	int rc = log_vmessage(log, msg, argp);
	va_end(argp);
	return rc;
}
1	/*
2	* log.c
3	*
4	* Copyright 2013 Red Hat, Inc.
5	* All rights reserved.
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
19	*/
20
21	#ifndef _GNU_SOURCE
22	#define _GNU_SOURCE
23	#endif
24
25	#include <errno.h>
26	#include <fcntl.h>
27	#include <stdarg.h>
28	#include <stdio.h>
29	#include <string.h>
30	#include <sys/types.h>
31	#include <sys/stat.h>
32	#include <time.h>
33	#include <unistd.h>
34
35	#include "log.h"
36
37	static int log_fd = -1;
38	static FILE *f = NULL;
39
40	static int
41	open_log(void)
42	{
43	if (log_fd > -1)
44	return 0;
45	log_fd = open("/var/log/grubby", O_RDWR\|O_APPEND\|O_CREAT\|O_CLOEXEC, 0600);
46	if (log_fd < 0)
47	return log_fd;
48
49	f = fdopen(log_fd, "a+");
50	if (f == NULL) {
51	typeof(errno) saved_errno = errno;
52	close(log_fd);
53	log_fd = -1;
54	errno = saved_errno;
55	return -1;
56	}
57
58	setbuf(f, NULL);
59	return 0;
60	}
61
62	int
63	log_time(FILE *log)
64	{
65	if (!log) {
66	int rc = open_log();
67	if (rc < 0)
68	return rc;
69	}
70
71	time_t t = time(NULL);
72	char timestr[27];
73
74	ctime_r(&t, timestr);
75	timestr[26] = '\0';
76	for (int i = 26; i >= 0; i--)
77	if (timestr[i] == '\n')
78	timestr[i] = '\0';
79
80	return log_message(log, "DBG: %d: %s: ", getpid(), timestr);
81	}
82
83	int
84	log_vmessage(FILE log, const char msg, va_list ap)
85	{
86	int rc;
87
88	if (!msg)
89	return -1;
90	if (msg[0] == '\0')
91	return 0;
92
93	if (!log) {
94	rc = open_log();
95	if (rc < 0)
96	return rc;
97	}
98
99	va_list aq;
100	va_copy(aq, ap);
101
102	vfprintf(log ? log : f, msg, aq);
103	va_end(aq);
104	fdatasync(log ? fileno(log) : log_fd);
105
106	return 0;
107	}
108
109	int
110	log_message(FILE log, const char msg, ...)
111	{
112	va_list argp;
113
114	va_start(argp, msg);
115	int rc = log_vmessage(log, msg, argp);
116	va_end(argp);
117	return rc;
118	}