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htop/linux/SystemdMeter.c

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/*
htop - SystemdMeter.c
(C) 2020 htop dev team
Released under the GNU GPLv2+, see the COPYING file
in the source distribution for its full text.
*/
#include "linux/SystemdMeter.h"
#include <dlfcn.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include "CRT.h"
#include "Macros.h"
#include "Object.h"
#include "RichString.h"
#include "Settings.h"
#include "XUtils.h"
#if defined(BUILD_STATIC) && defined(HAVE_LIBSYSTEMD)
#include <systemd/sd-bus.h>
#endif
#ifdef BUILD_STATIC
#define sym_sd_bus_open_system sd_bus_open_system
#define sym_sd_bus_get_property_string sd_bus_get_property_string
#define sym_sd_bus_get_property_trivial sd_bus_get_property_trivial
#define sym_sd_bus_unref sd_bus_unref
#else
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 void* dlopenHandle = NULL;
#endif /* BUILD_STATIC */
#if !defined(BUILD_STATIC) || defined(HAVE_LIBSYSTEMD)
static sd_bus* bus = NULL;
#endif /* !BUILD_STATIC || HAVE_LIBSYSTEMD */
#define INVALID_VALUE ((unsigned int)-1)
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 SystemdMeter_done(ATTR_UNUSED Meter* this) {
free(systemState);
systemState = NULL;
#ifdef BUILD_STATIC
# ifdef HAVE_LIBSYSTEMD
if (bus) {
sym_sd_bus_unref(bus);
}
bus = NULL;
# endif /* HAVE_LIBSYSTEMD */
#else /* BUILD_STATIC */
if (bus && dlopenHandle) {
sym_sd_bus_unref(bus);
}
bus = NULL;
if (dlopenHandle) {
dlclose(dlopenHandle);
dlopenHandle = NULL;
}
#endif /* BUILD_STATIC */
}
#if !defined(BUILD_STATIC) || defined(HAVE_LIBSYSTEMD)
static int updateViaLib(void) {
#ifndef BUILD_STATIC
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
}
#endif /* !BUILD_STATIC */
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;
#ifndef BUILD_STATIC
dlfailure:
if (dlopenHandle) {
dlclose(dlopenHandle);
dlopenHandle = NULL;
}
return -1;
#endif /* !BUILD_STATIC */
}
#endif /* !BUILD_STATIC || HAVE_LIBSYSTEMD */
static void updateViaExec(void) {
if (Settings_isReadonly())
return;
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);
// Use of NULL in variadic functions must have a pointer cast.
// The NULL constant is not required by standard to have a pointer type.
execlp("systemctl",
"systemctl",
"show",
"--property=SystemState",
"--property=NFailedUnits",
"--property=NNames",
"--property=NJobs",
"--property=NInstalledJobs",
(char *)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';
}
free_and_xStrdup(&systemState, 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(Meter* this) {
free(systemState);
systemState = NULL;
nFailedUnits = nInstalledJobs = nNames = nJobs = INVALID_VALUE;
#if !defined(BUILD_STATIC) || defined(HAVE_LIBSYSTEMD)
if (updateViaLib() < 0)
updateViaExec();
#else
updateViaExec();
#endif /* !BUILD_STATIC || HAVE_LIBSYSTEMD */
xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "%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 len;
int color = (systemState && String_eq(systemState, "running")) ? METER_VALUE_OK : METER_VALUE_ERROR;
RichString_writeAscii(out, CRT_colors[color], systemState ? systemState : "N/A");
RichString_appendAscii(out, CRT_colors[METER_TEXT], " (");
if (nFailedUnits == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
len = 1;
} else {
len = xSnprintf(buffer, sizeof(buffer), "%u", nFailedUnits);
}
RichString_appendnAscii(out, zeroDigitColor(nFailedUnits), buffer, len);
RichString_appendAscii(out, CRT_colors[METER_TEXT], "/");
if (nNames == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
len = 1;
} else {
len = xSnprintf(buffer, sizeof(buffer), "%u", nNames);
}
RichString_appendnAscii(out, valueDigitColor(nNames), buffer, len);
RichString_appendAscii(out, CRT_colors[METER_TEXT], " failed) (");
if (nJobs == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
len = 1;
} else {
len = xSnprintf(buffer, sizeof(buffer), "%u", nJobs);
}
RichString_appendnAscii(out, zeroDigitColor(nJobs), buffer, len);
RichString_appendAscii(out, CRT_colors[METER_TEXT], "/");
if (nInstalledJobs == INVALID_VALUE) {
buffer[0] = '?';
buffer[1] = '\0';
len = 1;
} else {
len = xSnprintf(buffer, sizeof(buffer), "%u", nInstalledJobs);
}
RichString_appendnAscii(out, valueDigitColor(nInstalledJobs), buffer, len);
RichString_appendAscii(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: ",
};
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