[#480] SysArchMeter to view kernel/arch info

At start, SysArchMeter calls the uname function to obtain the kernel
version and architecture. If available, the distro version is obtained
by calling lsb_release. The obtained values are stored in static
variables and used when updating the meter.

1 files changed, 83 insertions, 0 deletions

diff --git a/SysArchMeter.c b/SysArchMeter.c
new file mode 100644
index 00000000..083d079d
--- /dev/null
+++ b/SysArchMeter.c
@@ -0,0 +1,83 @@
+/*
+htop - SysArchMeter.c
+(C) 2021 htop dev team
+Released under the GNU GPLv2, see the COPYING file
+in the source distribution for its full text.
+*/
+#include "config.h"  // IWYU pragma: keep
+
+#include "SysArchMeter.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/utsname.h>
+
+#include "XUtils.h"
+
+
+static const int SysArchMeter_attributes[] = {HOSTNAME};
+
+static void SysArchMeter_updateValues(Meter* this, char* buffer, size_t size) {
+   static struct utsname uname_info;
+   static int uname_result;
+   static char distro[3][64] = { {'\0'}, {'\0'}, {'\0'} };
+   static bool loaded_data = false;
+
+   (void)this;
+
+   if(!loaded_data) {
+      uname_result = uname(&uname_info);
+      FILE* fp = popen("lsb_release --id --release --codename", "r");
+      if(fp) {
+         char line[96] = {'\0'};
+         size_t n = 0;
+
+         while(fgets(line, sizeof(line), fp)) {
+            n = strcspn(line, ":");
+            if(n > 0 && (n + 1) < strlen(line)) {
+               char* value = String_trim(&line[n + 1]);
+               line[n] = '\0';
+
+               if(String_eq(line, "Distributor ID"))
+                  snprintf(distro[0], sizeof(distro[0]), "%s", value);
+               else if(String_eq(line, "Release"))
+                  snprintf(distro[1], sizeof(distro[1]), "%s", value);
+               else if(String_eq(line, "Codename"))
+                  snprintf(distro[2], sizeof(distro[2]), "%s", value);
+
+               free(value);
+            }
+         }
+         if(!distro[0][0])
+            snprintf(distro[0], sizeof(distro[0]), "Unknown");
+         pclose(fp);
+      }
+      loaded_data = true;
+   }
+
+   if(uname_result == 0) {
+      if (distro[1][0] && distro[2][0])
+         snprintf(buffer, size, "%s %s [%s] / %s %s (%s)", uname_info.sysname, uname_info.release, uname_info.machine, distro[0], distro[1], distro[2]);
+      else if(distro[1][0])
+         snprintf(buffer, size, "%s %s [%s] / %s %s", uname_info.sysname, uname_info.release, uname_info.machine, distro[0], distro[1]);
+      else
+         snprintf(buffer, size, "%s %s [%s]", uname_info.sysname, uname_info.release, uname_info.machine);
+   } else {
+      snprintf(buffer, size, "Unknown");
+   }
+}
+
+const MeterClass SysArchMeter_class = {
+   .super = {
+      .extends = Class(Meter),
+      .delete = Meter_delete
+   },
+   .updateValues = SysArchMeter_updateValues,
+   .defaultMode = TEXT_METERMODE,
+   .maxItems = 0,
+   .total = 100.0,
+   .attributes = SysArchMeter_attributes,
+   .name = "System",
+   .uiName = "System",
+   .caption = "System: ",
+};