Drop cgroup conditional

cgroup is only checked on runtime if the column CGROUP is selected.

cgroup is currently disabled by default, but most distributions do
enable it.

Drop the cgroup configuration switch, to reduce the maintenance cost.

6 files changed, 6 insertions, 30 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ec020ef3..f70cd222 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,11 +49,11 @@ jobs:
     - name: Bootstrap
       run: ./autogen.sh
     - name: Configure
-      run: ./configure --enable-werror --enable-openvz --enable-cgroup --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors
+      run: ./configure --enable-werror --enable-openvz --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors
     - name: Build
       run: make -k
     - name: Distcheck
-      run: make distcheck DISTCHECK_CONFIGURE_FLAGS='--enable-werror --enable-openvz --enable-cgroup --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors'
+      run: make distcheck DISTCHECK_CONFIGURE_FLAGS='--enable-werror --enable-openvz --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors'
 
   build-ubuntu-latest-full-featured-clang:
     runs-on: ubuntu-latest
@@ -71,11 +71,11 @@ jobs:
     - name: Bootstrap
       run: ./autogen.sh
     - name: Configure
-      run: ./configure --enable-werror --enable-openvz --enable-cgroup --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors
+      run: ./configure --enable-werror --enable-openvz --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors
     - name: Build
       run: make -k
     - name: Distcheck
-      run: make distcheck DISTCHECK_CONFIGURE_FLAGS='--enable-werror --enable-openvz --enable-cgroup --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors'
+      run: make distcheck DISTCHECK_CONFIGURE_FLAGS='--enable-werror --enable-openvz --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors'
 
   build-ubuntu-latest-clang-analyzer:
     runs-on: ubuntu-latest
@@ -93,7 +93,7 @@ jobs:
     - name: Bootstrap
       run: ./autogen.sh
     - name: Configure
-      run: scan-build-11 -analyze-headers --status-bugs ./configure --enable-debug --enable-werror --enable-openvz --enable-cgroup --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors
+      run: scan-build-11 -analyze-headers --status-bugs ./configure --enable-debug --enable-werror --enable-openvz --enable-vserver --enable-ancient-vserver --enable-taskstats --enable-unicode --enable-hwloc --enable-setuid --enable-delayacct --enable-sensors
     - name: Build
       run: scan-build-11 -analyze-headers --status-bugs make -j"$(nproc)"
 
diff --git a/Makefile.am b/Makefile.am
index 351c1081..14e0b211 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -280,7 +280,7 @@ coverage:
 	$(MAKE) all AM_CPPFLAGS="-fprofile-arcs -ftest-coverage -DDEBUG" AM_LDFLAGS="-lgcov"
 
 cppcheck:
-	cppcheck -q -v . --enable=all -DHAVE_CGROUP -DHAVE_OPENVZ -DHAVE_TASKSTATS
+	cppcheck -q -v . --enable=all -DHAVE_OPENVZ -DHAVE_TASKSTATS
 
 dist-hook: $(top_distdir)/configure
 	@if grep 'pkg_m4_absent' '$(top_distdir)/configure'; then \
diff --git a/configure.ac b/configure.ac
index de47b516..79ec292e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -123,11 +123,6 @@ if test "x$enable_openvz" = xyes; then
    AC_DEFINE(HAVE_OPENVZ, 1, [Define if openvz support enabled.])
 fi
 
-AC_ARG_ENABLE(cgroup, [AS_HELP_STRING([--enable-cgroup], [enable cgroups support])], ,enable_cgroup="no")
-if test "x$enable_cgroup" = xyes; then
-   AC_DEFINE(HAVE_CGROUP, 1, [Define if cgroup support enabled.])
-fi
-
 AC_ARG_ENABLE(vserver, [AS_HELP_STRING([--enable-vserver], [enable VServer support])], ,enable_vserver="no")
 if test "x$enable_vserver" = xyes; then
     AC_DEFINE(HAVE_VSERVER, 1, [Define if vserver support enabled.])
@@ -390,7 +385,6 @@ AC_MSG_RESULT([
   platform:                  $my_htop_platform
   (Linux) proc directory:    $PROCDIR
   (Linux) openvz:            $enable_openvz
-  (Linux) cgroup:            $enable_cgroup
   (Linux) vserver:           $enable_vserver
   (Linux) ancient vserver:   $enable_ancient_vserver
   (Linux) taskstats:         $enable_taskstats
diff --git a/linux/LinuxProcess.c b/linux/LinuxProcess.c
index 3eaa6cbe..8cd59a5b 100644
--- a/linux/LinuxProcess.c
+++ b/linux/LinuxProcess.c
@@ -102,9 +102,7 @@ ProcessFieldData Process_fields[] = {
    [IO_WRITE_RATE] = { .name = "IO_WRITE_RATE", .title = " DISK WRITE ", .description = "The I/O rate of write(2) in bytes per second for the process", .flags = PROCESS_FLAG_IO, },
    [IO_RATE] = { .name = "IO_RATE", .title = "   DISK R/W ", .description = "Total I/O rate in bytes per second", .flags = PROCESS_FLAG_IO, },
 #endif
-#ifdef HAVE_CGROUP
    [CGROUP] = { .name = "CGROUP", .title = "    CGROUP ", .description = "Which cgroup the process is in", .flags = PROCESS_FLAG_LINUX_CGROUP, },
-#endif
    [OOM] = { .name = "OOM", .title = " OOM ", .description = "OOM (Out-of-Memory) killer score", .flags = PROCESS_FLAG_LINUX_OOM, },
    [IO_PRIORITY] = { .name = "IO_PRIORITY", .title = "IO ", .description = "I/O priority", .flags = PROCESS_FLAG_LINUX_IOPRIO, },
 #ifdef HAVE_DELAYACCT
@@ -156,9 +154,7 @@ Process* LinuxProcess_new(const Settings* settings) {
 void Process_delete(Object* cast) {
    LinuxProcess* this = (LinuxProcess*) cast;
    Process_done((Process*)cast);
-#ifdef HAVE_CGROUP
    free(this->cgroup);
-#endif
 #ifdef HAVE_OPENVZ
    free(this->ctid);
 #endif
@@ -680,9 +676,7 @@ static void LinuxProcess_writeField(const Process* this, RichString* str, Proces
    #ifdef HAVE_VSERVER
    case VXID: xSnprintf(buffer, n, "%5u ", lp->vxid); break;
    #endif
-   #ifdef HAVE_CGROUP
    case CGROUP: xSnprintf(buffer, n, "%-10s ", lp->cgroup ? lp->cgroup : ""); break;
-   #endif
    case OOM: xSnprintf(buffer, n, "%4u ", lp->oom); break;
    case IO_PRIORITY: {
       int klass = IOPriority_class(lp->ioPriority);
@@ -821,10 +815,8 @@ static long LinuxProcess_compare(const void* v1, const void* v2) {
    case VXID:
       return SPACESHIP_NUMBER(p2->vxid, p1->vxid);
    #endif
-   #ifdef HAVE_CGROUP
    case CGROUP:
       return SPACESHIP_NULLSTR(p1->cgroup, p2->cgroup);
-   #endif
    case OOM:
       return SPACESHIP_NUMBER(p2->oom, p1->oom);
    #ifdef HAVE_DELAYACCT
diff --git a/linux/LinuxProcess.h b/linux/LinuxProcess.h
index f5f33a77..d843a0c8 100644
--- a/linux/LinuxProcess.h
+++ b/linux/LinuxProcess.h
@@ -80,9 +80,7 @@ typedef enum LinuxProcessFields {
    IO_WRITE_RATE = 111,
    IO_RATE = 112,
    #endif
-   #ifdef HAVE_CGROUP
    CGROUP = 113,
-   #endif
    OOM = 114,
    IO_PRIORITY = 115,
    #ifdef HAVE_DELAYACCT
@@ -170,9 +168,7 @@ typedef struct LinuxProcess_ {
    #ifdef HAVE_VSERVER
    unsigned int vxid;
    #endif
-   #ifdef HAVE_CGROUP
    char* cgroup;
-   #endif
    unsigned int oom;
    char* ttyDevice;
    #ifdef HAVE_DELAYACCT
diff --git a/linux/LinuxProcessList.c b/linux/LinuxProcessList.c
index 8dafb681..506bea66 100644
--- a/linux/LinuxProcessList.c
+++ b/linux/LinuxProcessList.c
@@ -644,8 +644,6 @@ static void LinuxProcessList_readOpenVZData(LinuxProcess* process, const char* d
 
 #endif
 
-#ifdef HAVE_CGROUP
-
 static void LinuxProcessList_readCGroupFile(LinuxProcess* process, const char* dirname, const char* name) {
    char filename[MAX_NAME + 1];
    xSnprintf(filename, MAX_NAME, "%s/%s/cgroup", dirname, name);
@@ -684,8 +682,6 @@ static void LinuxProcessList_readCGroupFile(LinuxProcess* process, const char* d
    process->cgroup = xStrdup(output);
 }
 
-#endif
-
 #ifdef HAVE_VSERVER
 
 static void LinuxProcessList_readVServerData(LinuxProcess* process, const char* dirname, const char* name) {
@@ -1294,11 +1290,9 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, const char*
       LinuxProcessList_readDelayAcctData(this, lp);
       #endif
 
-      #ifdef HAVE_CGROUP
       if (settings->flags & PROCESS_FLAG_LINUX_CGROUP) {
          LinuxProcessList_readCGroupFile(lp, dirname, name);
       }
-      #endif
 
       if (settings->flags & PROCESS_FLAG_LINUX_OOM) {
          LinuxProcessList_readOomData(lp, dirname, name);