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Add SystemdMeter

This commit is contained in:
Christian Göttsche 2020-10-07 15:42:13 +02:00
parent ab17ef4dc0
commit 2a9e8ca074
7 changed files with 364 additions and 7 deletions
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18
CRT.c
View File

@ -95,9 +95,10 @@ int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
[METER_TEXT] = ColorPair(Cyan,Black),
[METER_VALUE] = A_BOLD | ColorPair(Cyan,Black),
[METER_VALUE_ERROR] = A_BOLD | ColorPair(Red,Black),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(White,Black),
[METER_VALUE_IOREAD] = ColorPair(Green,Black),
[METER_VALUE_IOWRITE] = ColorPair(Blue,Black),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(White,Black),
[METER_VALUE_OK] = ColorPair(Green,Black),
[LED_COLOR] = ColorPair(Green,Black),
[TASKS_RUNNING] = A_BOLD | ColorPair(Green,Black),
[PROCESS] = A_NORMAL,
@ -173,9 +174,10 @@ int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
[METER_TEXT] = A_NORMAL,
[METER_VALUE] = A_BOLD,
[METER_VALUE_ERROR] = A_BOLD,
[METER_VALUE_NOTICE] = A_BOLD,
[METER_VALUE_IOREAD] = A_NORMAL,
[METER_VALUE_IOWRITE] = A_NORMAL,
[METER_VALUE_NOTICE] = A_BOLD,
[METER_VALUE_OK] = A_NORMAL,
[LED_COLOR] = A_NORMAL,
[TASKS_RUNNING] = A_BOLD,
[PROCESS] = A_NORMAL,
@ -251,9 +253,10 @@ int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
[METER_TEXT] = ColorPair(Blue,White),
[METER_VALUE] = ColorPair(Black,White),
[METER_VALUE_ERROR] = A_BOLD | ColorPair(Red,White),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(Yellow,White),
[METER_VALUE_IOREAD] = ColorPair(Green,White),
[METER_VALUE_IOWRITE] = ColorPair(Yellow,White),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(Yellow,White),
[METER_VALUE_OK] = ColorPair(Green,White),
[LED_COLOR] = ColorPair(Green,White),
[TASKS_RUNNING] = ColorPair(Green,White),
[PROCESS] = ColorPair(Black,White),
@ -329,9 +332,10 @@ int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
[METER_TEXT] = ColorPair(Blue,Black),
[METER_VALUE] = ColorPair(Blue,Black),
[METER_VALUE_ERROR] = A_BOLD | ColorPair(Red,Black),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(Yellow,Black),
[METER_VALUE_IOREAD] = ColorPair(Green,Black),
[METER_VALUE_IOWRITE] = ColorPair(Yellow,Black),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(Yellow,Black),
[METER_VALUE_OK] = ColorPair(Green,Black),
[LED_COLOR] = ColorPair(Green,Black),
[TASKS_RUNNING] = ColorPair(Green,Black),
[PROCESS] = ColorPair(Blue,Black),
@ -407,9 +411,10 @@ int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
[METER_TEXT] = ColorPair(Cyan,Blue),
[METER_VALUE] = A_BOLD | ColorPair(Cyan,Blue),
[METER_VALUE_ERROR] = A_BOLD | ColorPair(Red,Blue),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(White,Blue),
[METER_VALUE_IOREAD] = ColorPair(Green,Blue),
[METER_VALUE_IOWRITE] = ColorPair(Black,Blue),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(White,Blue),
[METER_VALUE_OK] = ColorPair(Green,Blue),
[LED_COLOR] = ColorPair(Green,Blue),
[TASKS_RUNNING] = A_BOLD | ColorPair(Green,Blue),
[PROCESS] = ColorPair(White,Blue),
@ -485,9 +490,10 @@ int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
[METER_TEXT] = ColorPair(Cyan,Black),
[METER_VALUE] = ColorPair(Green,Black),
[METER_VALUE_ERROR] = A_BOLD | ColorPair(Red,Black),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(Yellow,Black),
[METER_VALUE_IOREAD] = ColorPair(Green,Black),
[METER_VALUE_IOWRITE] = ColorPair(Blue,Black),
[METER_VALUE_NOTICE] = A_BOLD | ColorPair(Yellow,Black),
[METER_VALUE_OK] = ColorPair(Green,Black),
[LED_COLOR] = ColorPair(Green,Black),
[TASKS_RUNNING] = A_BOLD | ColorPair(Green,Black),
[PROCESS] = ColorPair(Cyan,Black),

3
CRT.h
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@ -53,9 +53,10 @@ typedef enum ColorElements_ {
METER_TEXT,
METER_VALUE,
METER_VALUE_ERROR,
METER_VALUE_NOTICE,
METER_VALUE_IOREAD,
METER_VALUE_IOWRITE,
METER_VALUE_NOTICE,
METER_VALUE_OK,
LED_COLOR,
UPTIME,
BATTERY,

2
Makefile.am
View File

@ -130,6 +130,7 @@ linux_platform_headers = \
linux/Platform.h \
linux/PressureStallMeter.h \
linux/SELinuxMeter.h \
linux/SystemdMeter.h \
linux/ZramMeter.h \
linux/ZramStats.h \
zfs/ZfsArcMeter.h \
@ -146,6 +147,7 @@ myhtopplatsources = \
linux/Platform.c \
linux/PressureStallMeter.c \
linux/SELinuxMeter.c \
linux/SystemdMeter.c \
linux/ZramMeter.c \
zfs/ZfsArcMeter.c \
zfs/ZfsArcStats.c \

2
configure.ac
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@ -90,6 +90,8 @@ AC_FUNC_CLOSEDIR_VOID
AC_FUNC_STAT
AC_CHECK_FUNCS([fstatat memmove strncasecmp strstr strdup])
AC_SEARCH_LIBS([dlopen], [dl dld])
save_cflags="${CFLAGS}"
CFLAGS="${CFLAGS} -std=c99"
AC_MSG_CHECKING([whether cc -std=c99 option works])

2
linux/Platform.c
View File

@ -39,6 +39,7 @@ in the source distribution for its full text.
#include "SELinuxMeter.h"
#include "Settings.h"
#include "SwapMeter.h"
#include "SystemdMeter.h"
#include "TasksMeter.h"
#include "UptimeMeter.h"
#include "XUtils.h"
@ -153,6 +154,7 @@ const MeterClass* const Platform_meterTypes[] = {
&DiskIOMeter_class,
&NetworkIOMeter_class,
&SELinuxMeter_class,
&SystemdMeter_class,
NULL
};

329
linux/SystemdMeter.c Normal file
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@ -0,0 +1,329 @@
/*
htop - SystemdMeter.c
(C) 2020 Christian Göttsche
Released under the GNU GPLv2, see the COPYING file
in the source distribution for its full text.
*/
#include "SystemdMeter.h"
#include <dlfcn.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "CRT.h"
#include "XUtils.h"
#define INVALID_VALUE ((unsigned int)-1)
typedef void sd_bus;
typedef void sd_bus_error;
static int (*sym_sd_bus_open_system)(sd_bus**);
static int (*sym_sd_bus_get_property_string)(sd_bus*, const char*, const char*, const char*, const char*, sd_bus_error*, char**);
static int (*sym_sd_bus_get_property_trivial)(sd_bus*, const char*, const char*, const char*, const char*, sd_bus_error*, char, void*);
static sd_bus* (*sym_sd_bus_unref)(sd_bus*);
static char* systemState = NULL;
static unsigned int nFailedUnits = INVALID_VALUE;
static unsigned int nInstalledJobs = INVALID_VALUE;
static unsigned int nNames = INVALID_VALUE;
static unsigned int nJobs = INVALID_VALUE;
static void* dlopenHandle = NULL;
static sd_bus* bus = NULL;
static void SystemdMeter_done(ATTR_UNUSED Meter* this) {
free(systemState);
systemState = NULL;
if (bus && dlopenHandle) {
sym_sd_bus_unref(bus);
}
bus = NULL;
if (dlopenHandle) {
dlclose(dlopenHandle);
dlopenHandle = NULL;
}
}
static int updateViaLib(void) {
if (!dlopenHandle) {
dlopenHandle = dlopen("libsystemd.so.0", RTLD_LAZY);
if (!dlopenHandle)
goto dlfailure;
/* Clear any errors */
dlerror();
#define resolve(symbolname) do { \
*(void **)(&sym_##symbolname) = dlsym(dlopenHandle, #symbolname); \
if (!sym_##symbolname || dlerror() != NULL) \
goto dlfailure; \
} while(0)
resolve(sd_bus_open_system);
resolve(sd_bus_get_property_string);
resolve(sd_bus_get_property_trivial);
resolve(sd_bus_unref);
#undef resolve
}
int r;
/* Connect to the system bus */
if (!bus) {
r = sym_sd_bus_open_system(&bus);
if (r < 0)
goto busfailure;
}
static const char* const busServiceName = "org.freedesktop.systemd1";
static const char* const busObjectPath = "/org/freedesktop/systemd1";
static const char* const busInterfaceName = "org.freedesktop.systemd1.Manager";
r = sym_sd_bus_get_property_string(bus,
busServiceName, /* service to contact */
busObjectPath, /* object path */
busInterfaceName, /* interface name */
"SystemState", /* property name */
NULL, /* object to return error in */
&systemState);
if (r < 0)
goto busfailure;
r = sym_sd_bus_get_property_trivial(bus,
busServiceName, /* service to contact */
busObjectPath, /* object path */
busInterfaceName, /* interface name */
"NFailedUnits", /* property name */
NULL, /* object to return error in */
'u', /* property type */
&nFailedUnits);
if (r < 0)
goto busfailure;
r = sym_sd_bus_get_property_trivial(bus,
busServiceName, /* service to contact */
busObjectPath, /* object path */
busInterfaceName, /* interface name */
"NInstalledJobs", /* property name */
NULL, /* object to return error in */
'u', /* property type */
&nInstalledJobs);
if (r < 0)
goto busfailure;
r = sym_sd_bus_get_property_trivial(bus,
busServiceName, /* service to contact */
busObjectPath, /* object path */
busInterfaceName, /* interface name */
"NNames", /* property name */
NULL, /* object to return error in */
'u', /* property type */
&nNames);
if (r < 0)
goto busfailure;
r = sym_sd_bus_get_property_trivial(bus,
busServiceName, /* service to contact */
busObjectPath, /* object path */
busInterfaceName, /* interface name */
"NJobs", /* property name */
NULL, /* object to return error in */
'u', /* property type */
&nJobs);
if (r < 0)
goto busfailure;
/* success */
return 0;
busfailure:
sym_sd_bus_unref(bus);
bus = NULL;
return -2;
dlfailure:
if (dlopenHandle) {
dlclose(dlopenHandle);
dlopenHandle = NULL;
}
return -1;
}
static void updateViaExec(void) {
int fdpair[2];
if (pipe(fdpair) < 0)
return;
pid_t child = fork();
if (child < 0) {
close(fdpair[1]);
close(fdpair[0]);
return;
}
if (child == 0) {
close(fdpair[0]);
dup2(fdpair[1], STDOUT_FILENO);
close(fdpair[1]);
int fdnull = open("/dev/null", O_WRONLY);
if (fdnull < 0)
exit(1);
dup2(fdnull, STDERR_FILENO);
close(fdnull);
execl("/bin/systemctl",
"/bin/systemctl",
"show",
"--property=SystemState",
"--property=NFailedUnits",
"--property=NNames",
"--property=NJobs",
"--property=NInstalledJobs",
NULL);
exit(127);
}
close(fdpair[1]);
int wstatus;
if (waitpid(child, &wstatus, 0) < 0 || !WIFEXITED(wstatus) || WEXITSTATUS(wstatus) != 0) {
close(fdpair[0]);
return;
}
FILE* commandOutput = fdopen(fdpair[0], "r");
if (!commandOutput) {
close(fdpair[0]);
return;
}
char lineBuffer[128];
while (fgets(lineBuffer, sizeof(lineBuffer), commandOutput)) {
if (String_startsWith(lineBuffer, "SystemState=")) {
char* newline = strchr(lineBuffer + strlen("SystemState="), '\n');
if (newline)
*newline = '\0';
systemState = xStrdup(lineBuffer + strlen("SystemState="));
} else if (String_startsWith(lineBuffer, "NFailedUnits=")) {
nFailedUnits = strtoul(lineBuffer + strlen("NFailedUnits="), NULL, 10);
} else if (String_startsWith(lineBuffer, "NNames=")) {
nNames = strtoul(lineBuffer + strlen("NNames="), NULL, 10);
} else if (String_startsWith(lineBuffer, "NJobs=")) {
nJobs = strtoul(lineBuffer + strlen("NJobs="), NULL, 10);
} else if (String_startsWith(lineBuffer, "NInstalledJobs=")) {
nInstalledJobs = strtoul(lineBuffer + strlen("NInstalledJobs="), NULL, 10);
}
}
fclose(commandOutput);
}
static void SystemdMeter_updateValues(ATTR_UNUSED Meter* this, char* buffer, int size) {
free(systemState);
systemState = NULL;
nFailedUnits = nInstalledJobs = nNames = nJobs = INVALID_VALUE;
if (updateViaLib() < 0)
updateViaExec();
xSnprintf(buffer, size, "%s", systemState ? systemState : "???");
}
static int zeroDigitColor(unsigned int value) {
switch (value) {
case 0:
return CRT_colors[METER_VALUE];
case INVALID_VALUE:
return CRT_colors[METER_VALUE_ERROR];
default:
return CRT_colors[METER_VALUE_NOTICE];
}
}
static int valueDigitColor(unsigned int value) {
switch (value) {
case 0:
return CRT_colors[METER_VALUE_NOTICE];
case INVALID_VALUE:
return CRT_colors[METER_VALUE_ERROR];
default:
return CRT_colors[METER_VALUE];
}
}
static void SystemdMeter_display(ATTR_UNUSED const Object* cast, RichString* out) {
char buffer[16];
int color = (systemState && 0 == strcmp(systemState, "running")) ? METER_VALUE_OK : METER_VALUE_ERROR;
RichString_write(out, CRT_colors[color], systemState ? systemState : "???");
RichString_append(out, CRT_colors[METER_TEXT], " (");
if (nFailedUnits == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
} else {
xSnprintf(buffer, sizeof(buffer), "%u", nFailedUnits);
}
RichString_append(out, zeroDigitColor(nFailedUnits), buffer);
RichString_append(out, CRT_colors[METER_TEXT], "/");
if (nNames == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
} else {
xSnprintf(buffer, sizeof(buffer), "%u", nNames);
}
RichString_append(out, valueDigitColor(nNames), buffer);
RichString_append(out, CRT_colors[METER_TEXT], " failed) (");
if (nJobs == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
} else {
xSnprintf(buffer, sizeof(buffer), "%u", nJobs);
}
RichString_append(out, zeroDigitColor(nJobs), buffer);
RichString_append(out, CRT_colors[METER_TEXT], "/");
if (nInstalledJobs == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
} else {
xSnprintf(buffer, sizeof(buffer), "%u", nInstalledJobs);
}
RichString_append(out, valueDigitColor(nInstalledJobs), buffer);
RichString_append(out, CRT_colors[METER_TEXT], " jobs)");
}
static const int SystemdMeter_attributes[] = {
METER_VALUE
};
const MeterClass SystemdMeter_class = {
.super = {
.extends = Class(Meter),
.delete = Meter_delete,
.display = SystemdMeter_display
},
.updateValues = SystemdMeter_updateValues,
.done = SystemdMeter_done,
.defaultMode = TEXT_METERMODE,
.maxItems = 0,
.total = 100.0,
.attributes = SystemdMeter_attributes,
.name = "Systemd",
.uiName = "Systemd state",
.description = "Systemd system state and unit overview",
.caption = "Systemd: ",
};

15
linux/SystemdMeter.h Normal file
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@ -0,0 +1,15 @@
#ifndef HEADER_SystemdMeter
#define HEADER_SystemdMeter
/*
htop - SystemdMeter.h
(C) 2020 Christian Göttsche
Released under the GNU GPLv2, see the COPYING file
in the source distribution for its full text.
*/
#include "Meter.h"
extern const MeterClass SystemdMeter_class;
#endif /* HEADER_SystemdMeter */