Annotation of /trunk/grubby/log.c
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Revision 2236 -
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Mon Oct 21 13:19:07 2013 UTC (10 years, 11 months ago) by niro
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File size: 2186 byte(s)
Mon Oct 21 13:19:07 2013 UTC (10 years, 11 months ago) by niro
File MIME type: text/plain
File size: 2186 byte(s)
Add logging when things fail.
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 | } |