将时间从UTC更改为C中的当地时间

Question

我想在本地时间输出America/Los_Angeles到日志文件。目前，我用UTC获取时间。我希望在这三个函数中存在一个解决方案。

/* src/lib/timing.c line 196 */
char* xdebug_nanotime_to_chars(uint64_t nanotime, unsigned char precision)
{
char *res;
time_t secs;
secs = (time_t)(nanotime / NANOS_IN_SEC);
if (precision > 0) {
res = xdmalloc(30);
} else {
res = xdmalloc(20);
}
strftime(res, 20, "%Y-%m-%d %H:%M:%S", gmtime(&secs));
if (precision > 0) {
sprintf(res + 19, ".%09u", (uint32_t)(nanotime % NANOS_IN_SEC));
if (precision < 9) {
*(res + 20 + precision) = '';
}
}
return res;
}

打开日志。使用xdebug_nanotime_to_chars功能设置log_open_timestring。

/* src/lib/log.c line 586 */
void xdebug_open_log(void)
{
/* initialize remote log file */
XG_LIB(log_file) = NULL;
XG_LIB(log_opened_message_sent) = 0;
XG_LIB(log_open_timestring) = NULL;
if (XINI_LIB(log) && strlen(XINI_LIB(log))) {
XG_LIB(log_file) = xdebug_fopen(XINI_LIB(log), "a", NULL, NULL);
}
if (XG_LIB(log_file)) {
XG_LIB(log_open_timestring) = xdebug_nanotime_to_chars(xdebug_get_nanotime(), 6);
} else if (strlen(XINI_LIB(log))) {
xdebug_log_diagnose_permissions(XLOG_CHAN_LOGFILE, NULL, XINI_LIB(log));
}
}

将日志打开时间打印到日志文件：

/* src/lib/log.c line 56 */
static inline void xdebug_internal_log(int channel, int log_level, const char *message)
{
zend_ulong pid;
if (!XG_LIB(log_file)) {
return;
}
pid = xdebug_get_pid();
if (!XG_LIB(log_opened_message_sent) && XG_LIB(log_open_timestring)) {
XG_LIB(log_opened_message_sent) = 1;
fprintf(XG_LIB(log_file), "[" ZEND_ULONG_FMT "] Log opened at %sn", pid, XG_LIB(log_open_timestring));
fflush(XG_LIB(log_file));
xdfree(XG_LIB(log_open_timestring));
XG_LIB(log_open_timestring) = NULL;
}
fprintf(
XG_LIB(log_file),
"[" ZEND_ULONG_FMT "] %s%s%sn",
pid,
xdebug_channel_name[channel],
xdebug_log_prefix[log_level],
message
);
fflush(XG_LIB(log_file));
}

Answer 1

这最终变得非常简单。

我所要做的就是将gmtime更改为localtime，现在所有输出都在我的系统时间中，而不是UTC。

(当然，还必须从我修改过的源代码编译Xdebug。(

/* src/lib/timing.c line 196 */
char* xdebug_nanotime_to_chars(uint64_t nanotime, unsigned char precision)
{
char *res;
time_t secs;
secs = (time_t)(nanotime / NANOS_IN_SEC);
if (precision > 0) {
res = xdmalloc(30);
} else {
res = xdmalloc(20);
}
/* strftime(res, 20, "%Y-%m-%d %H:%M:%S", gmtime(&secs)); */ right here!
strftime(res, 20, "%Y-%m-%d %H:%M:%S", localtime(&secs));
if (precision > 0) {
sprintf(res + 19, ".%09u", (uint32_t)(nanotime % NANOS_IN_SEC));
if (precision < 9) {
*(res + 20 + precision) = '';
}
}
return res;
}

输出现在与我当前的时区相匹配，在下午5点之前：

[12122] Log opened at 2020-12-31 16:50:29.447626
[12122] Log closed at 2020-12-31 16:50:29.780099

我想如果我想让它绝对清楚的话，我可以把时区标识符添加到行的末尾。如果我这样做，我会编辑我的答案。

编辑：我添加了时区标识符。我创建了一个新函数，用于日志打开和关闭函数。

/* src/lib/log.c */
const char* custom_get_tz() /* placed near top of file */
{
time_t t = time(NULL);
struct tm lt = {0};
localtime_r(&t, &lt);
return lt.tm_zone;
}
.
.
.
/* around line 63 */
static inline void xdebug_internal_log(int channel, int log_level, const char *message)
{
.
.
.
/* fprintf(XG_LIB(log_file), "[" ZEND_ULONG_FMT "] Log opened at %sn", pid, XG_LIB(log_open_timestring)); */
fprintf(XG_LIB(log_file), "[" ZEND_ULONG_FMT "] Log opened at %s %sn", pid, XG_LIB(log_open_timestring), custom_get_tz());
.
.
.
}
.
.
.
/* around line 610 */
void xdebug_close_log()
{
.
.
.
/* fprintf(XG_LIB(log_file), "[" ZEND_ULONG_FMT "] Log closed at %snn", pid, timestr); */
fprintf(XG_LIB(log_file), "[" ZEND_ULONG_FMT "] Log closed at %s %snn", pid, timestr, custom_get_tz());
.
.
.
}

通过将系统时区更改为America/Goose_Bay和UTC:进行测试

[31250] Log opened at 2021-01-02 13:44:07.952185 PST
.
.
.
[31250] Log closed at 2021-01-02 13:44:07.957961 PST
[31252] Log opened at 2021-01-02 17:45:55.684079 AST
.
.
.
[31252] Log closed at 2021-01-02 17:45:55.687655 AST
[31254] Log opened at 2021-01-02 21:47:18.788958 UTC
.
.
.
[31254] Log closed at 2021-01-02 21:47:18.792282 UTC