1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "log.h"
LOG_SETUP(".log");
#include "log-target-file.h"
#include "internal.h"
#include <unistd.h>
#include <cstring>
#include <fcntl.h>
#include <cerrno>
#include <cassert>
namespace ns_log {
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
LogTargetFile::LogTargetFile(const char *target)
: LogTarget(target),
_failstate(FS_OK)
{
memset(_fname, 0, sizeof(_fname));
const char *fname = target + strlen("file:");
assert(strlen(fname) < sizeof(_fname));
// NOTE: This function cannot LOG()
if (strncmp(target, "file:", strlen("file:")) != 0) {
throwInvalid("Illegal log target '%s'", target);
}
strcpy(_fname, fname);
int fd = open(_fname, O_WRONLY | O_CREAT | O_APPEND | O_NOCTTY | O_LARGEFILE,
0666);
if (fd == -1) {
throwInvalid("Cannot open log target file '%s': %s",
target + strlen("file:"), strerror(errno));
}
close(fd);
}
LogTargetFile::~LogTargetFile()
{
}
// Here we must support log rotation. We do this by reopening the filename.
int
LogTargetFile::write(const char *buf, int bufLen)
{
int fd = open(_fname,
O_WRONLY | O_CREAT | O_APPEND | O_NOCTTY | O_LARGEFILE,
0666);
if (fd < 0) {
if (_failstate == FS_OK) {
_failstate = FS_FAILED;
LOG(warning, "cannot create %s: %s", _fname, strerror(errno));
LOG(warning, "Log file failed, falling back to stderr logging");
}
fd = dup(STDERR_FILENO);
} else {
if (_failstate != FS_OK) {
_failstate = FS_OK;
}
}
int retVal = ::write(fd, buf, bufLen);
close(fd);
return retVal;
}
} // end namespace ns_log
|
