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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 | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
0ad19a3f | 23 | #include <stdio.h> |
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 | ||
36 | #include <lxc/log.h> | |
37 | ||
6b9f3917 DL |
38 | #define LXC_LOG_PREFIX_SIZE 32 |
39 | #define LXC_LOG_BUFFER_SIZE 512 | |
40 | ||
41 | int lxc_log_fd = 2; | |
42 | static char log_prefix[LXC_LOG_PREFIX_SIZE] = "lxc"; | |
cb8c5720 CLG |
43 | |
44 | lxc_log_define(lxc_log, lxc); | |
45 | ||
46 | /*---------------------------------------------------------------------------*/ | |
47 | static int log_append_logfile(const struct lxc_log_appender *appender, | |
5fd8380b | 48 | struct lxc_log_event *event) |
cb8c5720 CLG |
49 | { |
50 | char buffer[LXC_LOG_BUFFER_SIZE]; | |
51 | int n; | |
52 | ||
53 | if (lxc_log_fd == -1) | |
54 | return 0; | |
55 | ||
56 | n = snprintf(buffer, sizeof(buffer), | |
57 | "%15s %10ld.%03ld %-8s %s - ", | |
58 | log_prefix, | |
59 | event->timestamp.tv_sec, | |
60 | event->timestamp.tv_usec / 1000, | |
61 | lxc_log_priority_to_string(event->priority), | |
62 | event->category); | |
63 | ||
64 | n += vsnprintf(buffer + n, sizeof(buffer) - n, event->fmt, | |
5fd8380b | 65 | *event->vap); |
cb8c5720 CLG |
66 | |
67 | if (n >= sizeof(buffer) - 1) { | |
5fd8380b | 68 | WARN("truncated next event from %d to %zd bytes", n, |
cb8c5720 CLG |
69 | sizeof(buffer)); |
70 | n = sizeof(buffer) - 1; | |
71 | } | |
72 | ||
73 | buffer[n] = '\n'; | |
74 | ||
75 | return write(lxc_log_fd, buffer, n + 1); | |
76 | } | |
77 | ||
78 | static struct lxc_log_appender log_appender_logfile = { | |
79 | .name = "logfile", | |
80 | .append = log_append_logfile, | |
81 | .next = NULL, | |
82 | }; | |
83 | ||
84 | static struct lxc_log_category log_root = { | |
85 | .name = "root", | |
86 | .priority = LXC_LOG_PRIORITY_ERROR, | |
87 | .appender = NULL, | |
88 | .parent = NULL, | |
89 | }; | |
90 | ||
91 | struct lxc_log_category lxc_log_category_lxc = { | |
92 | .name = "lxc", | |
93 | .priority = LXC_LOG_PRIORITY_ERROR, | |
94 | .appender = &log_appender_logfile, | |
95 | .parent = &log_root | |
96 | }; | |
97 | ||
98 | /*---------------------------------------------------------------------------*/ | |
99 | extern void lxc_log_setprefix(const char *prefix) | |
100 | { | |
101 | strncpy(log_prefix, prefix, sizeof(log_prefix)); | |
102 | log_prefix[sizeof(log_prefix) - 1] = 0; | |
103 | } | |
104 | ||
105 | /*---------------------------------------------------------------------------*/ | |
106 | static int log_open(const char *name) | |
107 | { | |
108 | int fd; | |
109 | int newfd; | |
110 | ||
111 | fd = open(name, O_CREAT | O_WRONLY | O_APPEND | O_CLOEXEC, 0666); | |
112 | if (fd == -1) { | |
113 | ERROR("failed to open log file \"%s\" : %s", name, | |
114 | strerror(errno)); | |
115 | return -1; | |
116 | } | |
117 | ||
118 | if (fd > 2) | |
119 | return fd; | |
120 | ||
121 | newfd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
122 | if (newfd == -1) | |
123 | ERROR("failed to dup log fd %d : %s", fd, strerror(errno)); | |
124 | ||
125 | close(fd); | |
126 | return newfd; | |
127 | } | |
128 | ||
129 | /*---------------------------------------------------------------------------*/ | |
51cab631 MN |
130 | extern int lxc_log_init(const char *file, const char *priority, |
131 | const char *prefix) | |
cb8c5720 | 132 | { |
51cab631 MN |
133 | int lxc_priority = LXC_LOG_PRIORITY_ERROR; |
134 | ||
135 | if (priority) { | |
136 | lxc_priority = lxc_log_priority_to_int(priority); | |
137 | ||
138 | if (lxc_priority == LXC_LOG_PRIORITY_NOTSET) { | |
139 | ERROR("invalid log priority %s", priority); | |
140 | return -1; | |
141 | } | |
142 | } | |
143 | ||
144 | lxc_log_category_lxc.priority = lxc_priority; | |
cb8c5720 CLG |
145 | |
146 | if (prefix) | |
147 | lxc_log_setprefix(prefix); | |
148 | ||
149 | if (file) { | |
150 | int fd; | |
151 | ||
152 | fd = log_open(file); | |
153 | if (fd == -1) { | |
154 | ERROR("failed to initialize log service"); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | lxc_log_fd = fd; | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } |