tags/grubby-8_36/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	niro	2236	/*
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			}