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log: optionally display thread ID in log output to tty

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This is very useful when playing around with threaded tests, but should
be useful in other cases too.
This commit is contained in:
Lennart Poettering 2020-09-29 13:06:12 +02:00
parent a182fa895b
commit 9ee806d1a8
3 changed files with 64 additions and 25 deletions
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46
man/systemd.xml
View file

@ -614,37 +614,38 @@
<variablelist class='environment-variables'>
<varlistentry>
<term><varname>$SYSTEMD_LOG_COLOR</varname></term>
<listitem><para>Controls whether systemd highlights important
log messages. This can be overridden with
<option>--log-color</option>.</para></listitem>
<listitem><para>Controls whether systemd highlights important log messages. This can be overridden
with <option>--log-color=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>$SYSTEMD_LOG_LEVEL</varname></term>
<listitem><para>systemd reads the log level from this
environment variable. This can be overridden with
<option>--log-level=</option>.</para></listitem>
<listitem><para>systemd reads the log level from this environment variable. This can be overridden
with <option>--log-level=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>$SYSTEMD_LOG_LOCATION</varname></term>
<listitem><para>Controls whether systemd prints the code
location along with log messages. This can be overridden with
<option>--log-location</option>.</para></listitem>
<listitem><para>Controls whether systemd prints the code location along with log messages. This can
be overridden with <option>--log-location=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>$SYSTEMD_LOG_TARGET</varname></term>
<listitem><para>systemd reads the log target from this
environment variable. This can be overridden with
<option>--log-target=</option>.</para></listitem>
<listitem><para>systemd reads the log target from this environment variable. This can be overridden
with <option>--log-target=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>$SYSTEMD_LOG_TIME</varname></term>
<listitem><para>Controls whether systemd prefixes log
messages with the current time. This can be overridden with
<option>--log-time=</option>.</para></listitem>
<listitem><para>Controls whether systemd prefixes log messages with the current time. This can be
overridden with <option>--log-time=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>$SYSTEMD_LOG_TID</varname></term>
<listitem><para>Controls whether systemd prefixes log messages with the current thread ID
(TID).</para></listitem>
</varlistentry>
<varlistentry>
@ -845,16 +846,15 @@
<term><varname>systemd.log_location</varname></term>
<term><varname>systemd.log_target=</varname></term>
<term><varname>systemd.log_time</varname></term>
<term><varname>systemd.log_tid</varname></term>
<listitem><para>Controls log output, with the same effect as the
<varname>$SYSTEMD_LOG_COLOR</varname>,
<varname>$SYSTEMD_LOG_LEVEL</varname>,
<varname>$SYSTEMD_LOG_LOCATION</varname>,
<varname>$SYSTEMD_LOG_TARGET</varname>,
<varname>$SYSTEMD_LOG_TIME</varname>, environment variables described above.
<varname>systemd.log_color</varname>, <varname>systemd.log_location</varname>, and
<varname>systemd.log_time</varname> can be specified without an argument, with the
same effect as a positive boolean.</para></listitem>
<varname>$SYSTEMD_LOG_COLOR</varname>, <varname>$SYSTEMD_LOG_LEVEL</varname>,
<varname>$SYSTEMD_LOG_LOCATION</varname>, <varname>$SYSTEMD_LOG_TARGET</varname>,
<varname>$SYSTEMD_LOG_TIME</varname>, <varname>$SYSTEMD_LOG_TID</varname> environment variables
described above. <varname>systemd.log_color</varname>, <varname>systemd.log_location</varname>,
<varname>systemd.log_time</varname> and <varname>systemd.log_tid=</varname> can be specified without
an argument, with the same effect as a positive boolean.</para></listitem>
</varlistentry>
<varlistentry>

40
src/basic/log.c
View file

@ -22,6 +22,7 @@
#include "io-util.h"
#include "log.h"
#include "macro.h"
#include "missing_syscall.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "process-util.h"
@ -53,6 +54,7 @@ static bool syslog_is_stream = false;
static bool show_color = false;
static bool show_location = false;
static bool show_time = false;
static bool show_tid = false;
static bool upgrade_syslog_to_journal = false;
static bool always_reopen_console = false;
@ -360,8 +362,9 @@ static int write_to_console(
char location[256],
header_time[FORMAT_TIMESTAMP_MAX],
prefix[1 + DECIMAL_STR_MAX(int) + 2];
struct iovec iovec[8] = {};
prefix[1 + DECIMAL_STR_MAX(int) + 2],
tid_string[3 + DECIMAL_STR_MAX(pid_t) + 1];
struct iovec iovec[9];
const char *on = NULL, *off = NULL;
size_t n = 0;
@ -380,6 +383,11 @@ static int write_to_console(
}
}
if (show_tid) {
xsprintf(tid_string, "(" PID_FMT ") ", gettid());
iovec[n++] = IOVEC_MAKE_STRING(tid_string);
}
if (show_color)
get_log_colors(LOG_PRI(level), &on, &off, NULL);
@ -1133,6 +1141,11 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
if (log_show_location_from_string(value ?: "1") < 0)
log_warning("Failed to parse log location setting '%s'. Ignoring.", value);
} else if (proc_cmdline_key_streq(key, "systemd.log_tid")) {
if (log_show_tid_from_string(value ?: "1") < 0)
log_warning("Failed to parse log tid setting '%s'. Ignoring.", value);
} else if (proc_cmdline_key_streq(key, "systemd.log_time")) {
if (log_show_time_from_string(value ?: "1") < 0)
@ -1177,6 +1190,10 @@ void log_parse_environment_cli_realm(LogRealm realm) {
e = getenv("SYSTEMD_LOG_TIME");
if (e && log_show_time_from_string(e) < 0)
log_warning("Failed to parse log time '%s'. Ignoring.", e);
e = getenv("SYSTEMD_LOG_TID");
if (e && log_show_tid_from_string(e) < 0)
log_warning("Failed to parse log tid '%s'. Ignoring.", e);
}
LogTarget log_get_target(void) {
@ -1211,6 +1228,14 @@ bool log_get_show_time(void) {
return show_time;
}
void log_show_tid(bool b) {
show_tid = b;
}
bool log_get_show_tid(void) {
return show_tid;
}
int log_show_color_from_string(const char *e) {
int t;
@ -1244,6 +1269,17 @@ int log_show_time_from_string(const char *e) {
return 0;
}
int log_show_tid_from_string(const char *e) {
int t;
t = parse_boolean(e);
if (t < 0)
return t;
log_show_tid(t);
return 0;
}
bool log_on_console(void) {
if (IN_SET(log_target, LOG_TARGET_CONSOLE,
LOG_TARGET_CONSOLE_PREFIXED))

3
src/basic/log.h
View file

@ -61,10 +61,13 @@ void log_show_location(bool b);
bool log_get_show_location(void) _pure_;
void log_show_time(bool b);
bool log_get_show_time(void) _pure_;
void log_show_tid(bool b);
bool log_get_show_tid(void) _pure_;
int log_show_color_from_string(const char *e);
int log_show_location_from_string(const char *e);
int log_show_time_from_string(const char *e);
int log_show_tid_from_string(const char *e);
LogTarget log_get_target(void) _pure_;
int log_get_max_level_realm(LogRealm realm) _pure_;