Magellan Linux

Contents of /tags/grubby-8_38/log.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 2979 - (show annotations) (download)
Thu Jun 30 10:24:52 2016 UTC (7 years, 9 months ago) by niro
File MIME type: text/plain
File size: 2186 byte(s)
tagged 'grubby-8_38'
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 }