Split platform dependent parts for file locks screen

19 files changed, 382 insertions, 263 deletions

diff --git a/Action.c b/Action.c
index aa9614a5..ee5b9af8 100644
--- a/Action.c
+++ b/Action.c
@@ -27,6 +27,7 @@ in the source distribution for its full text.
 #include "MainPanel.h"
 #include "OpenFilesScreen.h"
 #include "Process.h"
+#include "ProcessLocksScreen.h"
 #include "ProvideCurses.h"
 #include "ScreenManager.h"
 #include "SignalsPanel.h"
@@ -34,10 +35,6 @@ in the source distribution for its full text.
 #include "Vector.h"
 #include "XUtils.h"
 
-#ifdef HTOP_LINUX
-#include "linux/ProcessLocksScreen.h"
-#endif
-
 
 Object* Action_pickFromVector(State* st, Panel* list, int x, bool followProcess) {
    Panel* panel = st->panel;
@@ -375,7 +372,6 @@ static Htop_Reaction actionLsof(State* st) {
    return HTOP_REFRESH | HTOP_REDRAW_BAR;
 }
 
-#ifdef HTOP_LINUX
 static Htop_Reaction actionShowLocks(State* st) {
    Process* p = (Process*) Panel_getSelected(st->panel);
    if (!p) return HTOP_OK;
@@ -386,7 +382,6 @@ static Htop_Reaction actionShowLocks(State* st) {
    CRT_enableDelay();
    return HTOP_REFRESH | HTOP_REDRAW_BAR;
 }
-#endif
 
 static Htop_Reaction actionStrace(State* st) {
    Process* p = (Process*) Panel_getSelected(st->panel);
@@ -452,9 +447,7 @@ static const struct { const char* key; const char* info; } helpRight[] = {
    { .key = "      e: ", .info = "show process environment" },
    { .key = "      i: ", .info = "set IO priority" },
    { .key = "      l: ", .info = "list open files with lsof" },
-#ifdef HTOP_LINUX
    { .key = "      x: ", .info = "list file locks of process" },
-#endif
    { .key = "      s: ", .info = "trace syscalls with strace" },
    { .key = "      w: ", .info = "wrap process command in multiple lines" },
    { .key = " F2 C S: ", .info = "setup" },
@@ -640,9 +633,7 @@ void Action_setBindings(Htop_Action* keys) {
    keys['S'] = actionSetup;
    keys['C'] = actionSetup;
    keys[KEY_F(2)] = actionSetup;
-#ifdef HTOP_LINUX
    keys['x'] = actionShowLocks;
-#endif
    keys['l'] = actionLsof;
    keys['s'] = actionStrace;
    keys[' '] = actionTag;
diff --git a/Makefile.am b/Makefile.am
index c9193a86..9a3067ff 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -53,6 +53,7 @@ myhtopsources = \
 	Panel.c \
 	Process.c \
 	ProcessList.c \
+	ProcessLocksScreen.c \
 	RichString.c \
 	ScreenManager.c \
 	Settings.c \
@@ -105,6 +106,7 @@ myhtopheaders = \
 	Panel.h \
 	Process.h \
 	ProcessList.h \
+	ProcessLocksScreen.h \
 	ProvideCurses.h \
 	RichString.h \
 	ScreenManager.h \
@@ -129,7 +131,6 @@ linux_platform_headers = \
 	linux/LinuxProcessList.h \
 	linux/Platform.h \
 	linux/PressureStallMeter.h \
-	linux/ProcessLocksScreen.h \
 	linux/SELinuxMeter.h \
 	linux/ZramMeter.h \
 	linux/ZramStats.h \
@@ -146,7 +147,6 @@ myhtopplatsources = \
 	linux/LinuxProcessList.c \
 	linux/Platform.c \
 	linux/PressureStallMeter.c \
-	linux/ProcessLocksScreen.c \
 	linux/SELinuxMeter.c \
 	linux/ZramMeter.c \
 	zfs/ZfsArcMeter.c \
diff --git a/ProcessLocksScreen.c b/ProcessLocksScreen.c
new file mode 100644
index 00000000..480afccb
--- /dev/null
+++ b/ProcessLocksScreen.c
@@ -0,0 +1,114 @@
+/*
+htop - ProcessLocksScreen.c
+(C) 2020 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 "ProcessLocksScreen.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "CRT.h"
+#include "Compat.h"
+#include "FunctionBar.h"
+#include "IncSet.h"
+#include "Platform.h"
+#include "ProcessList.h"
+#include "XUtils.h"
+
+
+ProcessLocksScreen* ProcessLocksScreen_new(const Process* process) {
+   ProcessLocksScreen* this = xMalloc(sizeof(ProcessLocksScreen));
+   Object_setClass(this, Class(ProcessLocksScreen));
+   if (Process_isThread(process))
+      this->pid = process->tgid;
+   else
+      this->pid = process->pid;
+   return (ProcessLocksScreen*) InfoScreen_init(&this->super, process, NULL, LINES-3, "        ID  TYPE       EXCLUSION  READ/WRITE DEVICE:INODE                              START                  END  FILENAME");
+}
+
+void ProcessLocksScreen_delete(Object* this) {
+   free(InfoScreen_done((InfoScreen*)this));
+}
+
+static void ProcessLocksScreen_draw(InfoScreen* this) {
+   InfoScreen_drawTitled(this, "Snapshot of file locks of process %d - %s", ((ProcessLocksScreen*)this)->pid, this->process->comm);
+}
+
+static inline void FileLocks_Data_clear(FileLocks_Data* data) {
+   for (size_t i = 0; i < ARRAYSIZE(data->data); i++)
+      free(data->data[i]);
+}
+
+static void ProcessLocksScreen_scan(InfoScreen* this) {
+   Panel* panel = this->display;
+   int idx = Panel_getSelectedIndex(panel);
+   Panel_prune(panel);
+   FileLocks_ProcessData* pdata = Platform_getProcessLocks(((ProcessLocksScreen*)this)->pid);
+   if (!pdata) {
+      InfoScreen_addLine(this, "This feature is not supported on your platform.");
+   } else if (pdata->error) {
+      InfoScreen_addLine(this, "Could not determine file locks.");
+   } else {
+      FileLocks_LockData* ldata = pdata->locks;
+      if (!ldata) {
+         InfoScreen_addLine(this, "No locks have been found for the selected process.");
+      }
+      while (ldata) {
+         FileLocks_Data* data = &ldata->data;
+
+         char entry[512];
+         if (ULLONG_MAX == data->end) {
+            xSnprintf(entry, sizeof(entry), "%10d  %-10s %-10s %-10s %02x:%02x:%020"PRIu64" %20"PRIu64" %20s  %s",
+               data->id,
+               data->data[0], data->data[1], data->data[2],
+               data->dev[0], data->dev[1], data->inode,
+               data->start, "<END OF FILE>",
+               data->data[3] ? data->data[3] : "<N/A>"
+            );
+         } else {
+            xSnprintf(entry, sizeof(entry), "%10d  %-10s %-10s %-10s %02x:%02x:%020"PRIu64" %20"PRIu64" %20"PRIu64"  %s",
+               data->id,
+               data->data[0], data->data[1], data->data[2],
+               data->dev[0], data->dev[1], data->inode,
+               data->start, data->end,
+               data->data[3] ? data->data[3] : "<N/A>"
+            );
+         }
+
+         InfoScreen_addLine(this, entry);
+         FileLocks_Data_clear(&ldata->data);
+
+         FileLocks_LockData* old = ldata;
+         ldata = ldata->next;
+         free(old);
+      }
+   }
+   free(pdata);
+   Vector_insertionSort(this->lines);
+   Vector_insertionSort(panel->items);
+   Panel_setSelected(panel, idx);
+}
+
+const InfoScreenClass ProcessLocksScreen_class = {
+   .super = {
+      .extends = Class(Object),
+      .delete = ProcessLocksScreen_delete
+   },
+   .scan = ProcessLocksScreen_scan,
+   .draw = ProcessLocksScreen_draw
+};
diff --git a/linux/ProcessLocksScreen.h b/ProcessLocksScreen.h
index ec940fba..5da53adc 100644
--- a/linux/ProcessLocksScreen.h
+++ b/ProcessLocksScreen.h
@@ -17,6 +17,25 @@ typedef struct ProcessLocksScreen_ {
    pid_t pid;
 } ProcessLocksScreen;
 
+typedef struct FileLocks_Data_ {
+   char* data[4];
+   int id;
+   unsigned int dev[2];
+   uint64_t inode;
+   uint64_t start;
+   uint64_t end;
+} FileLocks_Data;
+
+typedef struct FileLocks_LockData_ {
+   FileLocks_Data data;
+   struct FileLocks_LockData_* next;
+} FileLocks_LockData;
+
+typedef struct FileLocks_ProcessData_ {
+   bool error;
+   struct FileLocks_LockData_* locks;
+} FileLocks_ProcessData;
+
 extern const InfoScreenClass ProcessLocksScreen_class;
 
 ProcessLocksScreen* ProcessLocksScreen_new(const Process* process);
diff --git a/darwin/Platform.c b/darwin/Platform.c
index b1f9283d..1f9120cb 100644
--- a/darwin/Platform.c
+++ b/darwin/Platform.c
@@ -17,6 +17,7 @@ in the source distribution for its full text.
 #include "DateMeter.h"
 #include "DateTimeMeter.h"
 #include "HostnameMeter.h"
+#include "ProcessLocksScreen.h"
 #include "UptimeMeter.h"
 #include "zfs/ZfsArcMeter.h"
 #include "zfs/ZfsCompressedArcMeter.h"
@@ -311,6 +312,17 @@ char* Platform_getProcessEnv(pid_t pid) {
    return env;
 }
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
+    (void)pid;
+    (void)inode;
+    return NULL;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+    (void)pid;
+    return NULL;
+}
+
 bool Platform_getDiskIO(DiskIOData* data) {
    // TODO
    (void)data;
diff --git a/darwin/Platform.h b/darwin/Platform.h
index 471b38a9..2eb34372 100644
--- a/darwin/Platform.h
+++ b/darwin/Platform.h
@@ -8,12 +8,17 @@ Released under the GNU GPLv2, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include <stdbool.h>
+#include <sys/types.h>
+
 #include "Action.h"
-#include "SignalsPanel.h"
-#include "CPUMeter.h"
-#include "DiskIOMeter.h"
 #include "BatteryMeter.h"
+#include "CPUMeter.h"
 #include "DarwinProcess.h"
+#include "DiskIOMeter.h"
+#include "ProcessLocksScreen.h"
+#include "SignalsPanel.h"
+
 
 extern ProcessField Platform_defaultFields[];
 
@@ -49,6 +54,10 @@ void Platform_setZfsCompressedArcValues(Meter* this);
 
 char* Platform_getProcessEnv(pid_t pid);
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
 bool Platform_getDiskIO(DiskIOData* data);
 
 bool Platform_getNetworkIO(unsigned long int *bytesReceived,
diff --git a/dragonflybsd/Platform.c b/dragonflybsd/Platform.c
index 5b81c610..d0cda8c2 100644
--- a/dragonflybsd/Platform.c
+++ b/dragonflybsd/Platform.c
@@ -206,6 +206,17 @@ char* Platform_getProcessEnv(pid_t pid) {
    return NULL;
 }
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
+    (void)pid;
+    (void)inode;
+    return NULL;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+    (void)pid;
+    return NULL;
+}
+
 bool Platform_getDiskIO(DiskIOData* data) {
    // TODO
    (void)data;
diff --git a/dragonflybsd/Platform.h b/dragonflybsd/Platform.h
index 6c884719..41fe44cd 100644
--- a/dragonflybsd/Platform.h
+++ b/dragonflybsd/Platform.h
@@ -8,9 +8,13 @@ Released under the GNU GPLv2, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include <stdbool.h>
+#include <sys/types.h>
+
 #include "Action.h"
 #include "BatteryMeter.h"
 #include "DiskIOMeter.h"
+#include "ProcessLocksScreen.h"
 #include "SignalsPanel.h"
 
 extern ProcessFieldData Process_fields[];
@@ -41,6 +45,10 @@ void Platform_setSwapValues(Meter* this);
 
 char* Platform_getProcessEnv(pid_t pid);
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
 bool Platform_getDiskIO(DiskIOData* data);
 
 bool Platform_getNetworkIO(unsigned long int *bytesReceived,
diff --git a/freebsd/Platform.c b/freebsd/Platform.c
index bdd49bf6..a49cfd25 100644
--- a/freebsd/Platform.c
+++ b/freebsd/Platform.c
@@ -243,6 +243,17 @@ char* Platform_getProcessEnv(pid_t pid) {
    return env;
 }
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
+    (void)pid;
+    (void)inode;
+    return NULL;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+    (void)pid;
+    return NULL;
+}
+
 bool Platform_getDiskIO(DiskIOData* data) {
 
    if (devstat_checkversion(NULL) < 0)
diff --git a/freebsd/Platform.h b/freebsd/Platform.h
index 894b3e25..2cdd068d 100644
--- a/freebsd/Platform.h
+++ b/freebsd/Platform.h
@@ -7,9 +7,13 @@ Released under the GNU GPLv2, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include <stdbool.h>
+#include <sys/types.h>
+
 #include "Action.h"
 #include "BatteryMeter.h"
 #include "DiskIOMeter.h"
+#include "ProcessLocksScreen.h"
 #include "SignalsPanel.h"
 
 extern ProcessFieldData Process_fields[];
@@ -44,6 +48,10 @@ void Platform_setZfsCompressedArcValues(Meter* this);
 
 char* Platform_getProcessEnv(pid_t pid);
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
 bool Platform_getDiskIO(DiskIOData* data);
 
 bool Platform_getNetworkIO(unsigned long int *bytesReceived,
diff --git a/linux/Platform.c b/linux/Platform.c
index f7a768c9..7e51bf61 100644
--- a/linux/Platform.c
+++ b/linux/Platform.c
@@ -11,11 +11,16 @@ in the source distribution for its full text.
 
 #include <assert.h>
 #include <ctype.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <limits.h>
 #include <math.h>
 #include <stdio.h>
 
 #include "BatteryMeter.h"
 #include "ClockMeter.h"
+#include "Compat.h"
 #include "CPUMeter.h"
 #include "DateMeter.h"
 #include "DateTimeMeter.h"
@@ -304,6 +309,120 @@ char* Platform_getProcessEnv(pid_t pid) {
    return env;
 }
 
+/*
+ * Return the absolute path of a file given its pid&inode number
+ *
+ * Based on implementation of lslocks from util-linux:
+ * https://sources.debian.org/src/util-linux/2.36-3/misc-utils/lslocks.c/#L162
+ */
+char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
+   struct stat sb;
+   struct dirent *de;
+   DIR *dirp;
+   size_t len;
+   int fd;
+
+   char path[PATH_MAX];
+   char sym[PATH_MAX];
+   char* ret = NULL;
+
+   memset(path, 0, sizeof(path));
+   memset(sym, 0, sizeof(sym));
+
+   xSnprintf(path, sizeof(path), "%s/%d/fd/", PROCDIR, pid);
+   if (strlen(path) >= (sizeof(path) - 2))
+      return NULL;
+
+   if (!(dirp = opendir(path)))
+      return NULL;
+
+   if ((fd = dirfd(dirp)) < 0 )
+      goto out;
+
+   while ((de = readdir(dirp))) {
+      if (String_eq(de->d_name, ".") || String_eq(de->d_name, ".."))
+         continue;
+
+      /* care only for numerical descriptors */
+      if (!strtoull(de->d_name, (char **) NULL, 10))
+         continue;
+
+      if (!Compat_fstatat(fd, path, de->d_name, &sb, 0) && inode != sb.st_ino)
+         continue;
+
+      if ((len = Compat_readlinkat(fd, path, de->d_name, sym, sizeof(sym) - 1)) < 1)
+         goto out;
+
+      sym[len] = '\0';
+
+      ret = xStrdup(sym);
+      break;
+   }
+
+out:
+   closedir(dirp);
+   return ret;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+   FileLocks_ProcessData* pdata = xCalloc(1, sizeof(FileLocks_ProcessData));
+
+   FILE* f = fopen(PROCDIR "/locks", "r");
+   if (!f) {
+      pdata->error = true;
+      return pdata;
+   }
+
+   char buffer[1024];
+   FileLocks_LockData** data_ref = &pdata->locks;
+   while(fgets(buffer, sizeof(buffer), f)) {
+      if (!strchr(buffer, '\n'))
+         continue;
+
+      int lock_id;
+      char lock_type[16];
+      char lock_excl[16];
+      char lock_rw[16];
+      pid_t lock_pid;
+      unsigned int lock_dev[2];
+      uint64_t lock_inode;
+      char lock_start[25];
+      char lock_end[25];
+
+      if (10 != sscanf(buffer, "%d:  %15s  %15s %15s %d %x:%x:%"PRIu64" %24s %24s",
+         &lock_id, lock_type, lock_excl, lock_rw, &lock_pid,
+         &lock_dev[0], &lock_dev[1], &lock_inode,
+         lock_start, lock_end))
+         continue;
+
+      if (pid != lock_pid)
+         continue;
+
+      FileLocks_LockData* ldata = xCalloc(1, sizeof(FileLocks_LockData));
+      FileLocks_Data* data = &ldata->data;
+      data->id = lock_id;
+      data->data[0] = xStrdup(lock_type);
+      data->data[1] = xStrdup(lock_excl);
+      data->data[2] = xStrdup(lock_rw);
+      data->data[3] = Platform_getInodeFilename(lock_pid, lock_inode);
+      data->dev[0] = lock_dev[0];
+      data->dev[1] = lock_dev[1];
+      data->inode = lock_inode;
+      data->start = strtoull(lock_start, NULL, 10);
+      if (!String_eq(lock_end, "EOF")) {
+         data->end = strtoull(lock_end, NULL, 10);
+      } else {
+         data->end = ULLONG_MAX;
+      }
+
+      *data_ref = ldata;
+      data_ref = &ldata->next;
+   }
+
+   fclose(f);
+   return pdata;
+}
+
 void Platform_getPressureStall(const char *file, bool some, double* ten, double* sixty, double* threehundred) {
    *ten = *sixty = *threehundred = 0;
    char procname[128+1];
diff --git a/linux/Platform.h b/linux/Platform.h
index b61a4db8..5a661a04 100644
--- a/linux/Platform.h
+++ b/linux/Platform.h
@@ -14,6 +14,7 @@ in the source distribution for its full text.
 #include "DiskIOMeter.h"
 #include "Meter.h"
 #include "Process.h"
+#include "ProcessLocksScreen.h"
 #include "SignalsPanel.h"
 
 extern ProcessField Platform_defaultFields[];
@@ -45,8 +46,13 @@ void Platform_setZramValues(Meter* this);
 void Platform_setZfsArcValues(Meter* this);
 
 void Platform_setZfsCompressedArcValues(Meter* this);
+
 char* Platform_getProcessEnv(pid_t pid);
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
 void Platform_getPressureStall(const char *file, bool some, double* ten, double* sixty, double* threehundred);
 
 bool Platform_getDiskIO(DiskIOData* data);
diff --git a/linux/ProcessLocksScreen.c b/linux/ProcessLocksScreen.c
deleted file mode 100644
index c93d2845..00000000
--- a/linux/ProcessLocksScreen.c
+++ /dev/null
@@ -1,244 +0,0 @@
-/*
-htop - ProcessLocksScreen.c
-(C) 2020 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 "ProcessLocksScreen.h"
-
-#include <dirent.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <limits.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-#include "CRT.h"
-#include "Compat.h"
-#include "FunctionBar.h"
-#include "IncSet.h"
-#include "ProcessList.h"
-#include "XUtils.h"
-
-
-typedef struct FileLocks_Data_ {
-   char* data[4];
-   int id;
-   unsigned int dev[2];
-   uint64_t inode;
-   uint64_t start;
-   uint64_t end;
-} FileLocks_Data;
-
-typedef struct FileLocks_ProcessData_ {
-   bool error;
-   struct FileLocks_LockData_* locks;
-} FileLocks_ProcessData;
-
-typedef struct FileLocks_LockData_ {
-   FileLocks_Data data;
-   struct FileLocks_LockData_* next;
-} FileLocks_LockData;
-
-ProcessLocksScreen* ProcessLocksScreen_new(const Process* process) {
-   ProcessLocksScreen* this = xMalloc(sizeof(ProcessLocksScreen));
-   Object_setClass(this, Class(ProcessLocksScreen));
-   if (Process_isThread(process))
-      this->pid = process->tgid;
-   else
-      this->pid = process->pid;
-   return (ProcessLocksScreen*) InfoScreen_init(&this->super, process, NULL, LINES-3, "        ID  TYPE       EXCLUSION  READ/WRITE DEVICE:INODE                              START                  END  FILENAME");
-}
-
-void ProcessLocksScreen_delete(Object* this) {
-   free(InfoScreen_done((InfoScreen*)this));
-}
-
-static void ProcessLocksScreen_draw(InfoScreen* this) {
-   InfoScreen_drawTitled(this, "Snapshot of file locks of process %d - %s", ((ProcessLocksScreen*)this)->pid, this->process->comm);
-}
-
-/*
- * Return the absolute path of a file given its pid&inode number
- *
- * Based on implementation of lslocks from util-linux:
- * https://sources.debian.org/src/util-linux/2.36-3/misc-utils/lslocks.c/#L162
- */
-static char *ProcessLocksScreen_getInodeFilename(pid_t pid, ino_t inode) {
-   struct stat sb;
-   struct dirent *de;
-   DIR *dirp;
-   size_t len;
-   int fd;
-
-   char path[PATH_MAX];
-   char sym[PATH_MAX];
-   char* ret = NULL;
-
-   memset(path, 0, sizeof(path));
-   memset(sym, 0, sizeof(sym));
-
-   xSnprintf(path, sizeof(path), "%s/%d/fd/", PROCDIR, pid);
-   if (strlen(path) >= (sizeof(path) - 2))
-      return NULL;
-
-   if (!(dirp = opendir(path)))
-      return NULL;
-
-   if ((fd = dirfd(dirp)) < 0 )
-      goto out;
-
-   while ((de = readdir(dirp))) {
-      if (String_eq(de->d_name, ".") || String_eq(de->d_name, ".."))
-         continue;
-
-      /* care only for numerical descriptors */
-      if (!strtoull(de->d_name, (char **) NULL, 10))
-         continue;
-
-      if (!Compat_fstatat(fd, path, de->d_name, &sb, 0) && inode != sb.st_ino)
-         continue;
-
-      if ((len = Compat_readlinkat(fd, path, de->d_name, sym, sizeof(sym) - 1)) < 1)
-         goto out;
-
-      sym[len] = '\0';
-
-      ret = xStrdup(sym);
-      break;
-   }
-
-out:
-   closedir(dirp);
-   return ret;
-}
-
-static FileLocks_ProcessData* ProcessLocksScreen_getProcessData(pid_t pid) {
-   FileLocks_ProcessData* pdata = xCalloc(1, sizeof(FileLocks_ProcessData));
-
-   FILE* f = fopen(PROCDIR "/locks", "r");
-   if (!f) {
-      pdata->error = true;
-      return pdata;
-   }
-
-   char buffer[1024];
-   FileLocks_LockData** data_ref = &pdata->locks;
-   while(fgets(buffer, sizeof(buffer), f)) {
-      if (!strchr(buffer, '\n'))
-         continue;
-
-      int lock_id;
-      char lock_type[16];
-      char lock_excl[16];
-      char lock_rw[16];
-      pid_t lock_pid;
-      unsigned int lock_dev[2];
-      uint64_t lock_inode;
-      char lock_start[25];
-      char lock_end[25];
-
-      if (10 != sscanf(buffer, "%d:  %15s  %15s %15s %d %x:%x:%"PRIu64" %24s %24s",
-         &lock_id, lock_type, lock_excl, lock_rw, &lock_pid,
-         &lock_dev[0], &lock_dev[1], &lock_inode,
-         lock_start, lock_end))
-         continue;
-
-      if (pid != lock_pid)
-         continue;
-
-      FileLocks_LockData* ldata = xCalloc(1, sizeof(FileLocks_LockData));
-      FileLocks_Data* data = &ldata->data;
-      data->id = lock_id;
-      data->data[0] = xStrdup(lock_type);
-      data->data[1] = xStrdup(lock_excl);
-      data->data[2] = xStrdup(lock_rw);
-      data->data[3] = ProcessLocksScreen_getInodeFilename(lock_pid, lock_inode);
-      data->dev[0] = lock_dev[0];
-      data->dev[1] = lock_dev[1];
-      data->inode = lock_inode;
-      data->start = strtoull(lock_start, NULL, 10);
-      if (!String_eq(lock_end, "EOF")) {
-         data->end = strtoull(lock_end, NULL, 10);
-      } else {
-         data->end = ULLONG_MAX;
-      }
-
-      *data_ref = ldata;
-      data_ref = &ldata->next;
-   }
-
-   fclose(f);
-   return pdata;
-}
-
-static inline void FileLocks_Data_clear(FileLocks_Data* data) {
-   for (size_t i = 0; i < ARRAYSIZE(data->data); i++)
-      free(data->data[i]);
-}
-
-static void ProcessLocksScreen_scan(InfoScreen* this) {
-   Panel* panel = this->display;
-   int idx = Panel_getSelectedIndex(panel);
-   Panel_prune(panel);
-   FileLocks_ProcessData* pdata = ProcessLocksScreen_getProcessData(((ProcessLocksScreen*)this)->pid);
-   if (pdata->error) {
-      InfoScreen_addLine(this, "Could not read file locks.");
-   } else {
-      FileLocks_LockData* ldata = pdata->locks;
-      if (!ldata) {
-         InfoScreen_addLine(this, "No locks have been found for the selected process.");
-      }
-      while (ldata) {
-         FileLocks_Data* data = &ldata->data;
-
-         char entry[512];
-         if (ULLONG_MAX == data->end) {
-            xSnprintf(entry, sizeof(entry), "%10d  %-10s %-10s %-10s %02x:%02x:%020"PRIu64" %20"PRIu64" %20s  %s",
-               data->id,
-               data->data[0], data->data[1], data->data[2],
-               data->dev[0], data->dev[1], data->inode,
-               data->start, "<END OF FILE>",
-               data->data[3] ? data->data[3] : "<N/A>"
-            );
-         } else {
-            xSnprintf(entry, sizeof(entry), "%10d  %-10s %-10s %-10s %02x:%02x:%020"PRIu64" %20"PRIu64" %20"PRIu64"  %s",
-               data->id,
-               data->data[0], data->data[1], data->data[2],
-               data->dev[0], data->dev[1], data->inode,
-               data->start, data->end,
-               data->data[3] ? data->data[3] : "<N/A>"
-            );
-         }
-
-         InfoScreen_addLine(this, entry);
-         FileLocks_Data_clear(&ldata->data);
-
-         FileLocks_LockData* old = ldata;
-         ldata = ldata->next;
-         free(old);
-      }
-   }
-   free(pdata);
-   Vector_insertionSort(this->lines);
-   Vector_insertionSort(panel->items);
-   Panel_setSelected(panel, idx);
-}
-
-const InfoScreenClass ProcessLocksScreen_class = {
-   .super = {
-      .extends = Class(Object),
-      .delete = ProcessLocksScreen_delete
-   },
-   .scan = ProcessLocksScreen_scan,
-   .draw = ProcessLocksScreen_draw
-};
diff --git a/openbsd/Platform.c b/openbsd/Platform.c
index df6bc0cc..a24d6a2d 100644
--- a/openbsd/Platform.c
+++ b/openbsd/Platform.c
@@ -288,6 +288,17 @@ char* Platform_getProcessEnv(pid_t pid) {
    return env;
 }
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
+    (void)pid;
+    (void)inode;
+    return NULL;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+    (void)pid;
+    return NULL;
+}
+
 bool Platform_getDiskIO(DiskIOData* data) {
    // TODO
    (void)data;
diff --git a/openbsd/Platform.h b/openbsd/Platform.h
index 8cb5bdf3..c7f4e4d7 100644
--- a/openbsd/Platform.h
+++ b/openbsd/Platform.h
@@ -8,9 +8,13 @@ Released under the GNU GPLv2, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include <stdbool.h>
+#include <sys/types.h>
+
 #include "Action.h"
 #include "BatteryMeter.h"
 #include "DiskIOMeter.h"
+#include "ProcessLocksScreen.h"
 #include "SignalsPanel.h"
 
 extern ProcessFieldData Process_fields[];
@@ -42,6 +46,10 @@ void Platform_setSwapValues(Meter* this);
 
 char* Platform_getProcessEnv(pid_t pid);
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
 bool Platform_getDiskIO(DiskIOData* data);
 
 bool Platform_getNetworkIO(unsigned long int *bytesReceived,
diff --git a/solaris/Platform.c b/solaris/Platform.c
index 87247969..8e08c025 100644
--- a/solaris/Platform.c
+++ b/solaris/Platform.c
@@ -264,6 +264,17 @@ char* Platform_getProcessEnv(pid_t pid) {
    return envBuilder.env;
 }
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
+    (void)pid;
+    (void)inode;
+    return NULL;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+    (void)pid;
+    return NULL;
+}
+
 bool Platform_getDiskIO(DiskIOData* data) {
    // TODO
    (void)data;
diff --git a/solaris/Platform.h b/solaris/Platform.h
index 8718dbfe..5db271ce 100644
--- a/solaris/Platform.h
+++ b/solaris/Platform.h
@@ -9,14 +9,19 @@ Released under the GNU GPLv2, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include <libproc.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <sys/mkdev.h>
+#include <sys/proc.h>
+#include <sys/types.h>
+
 #include "Action.h"
 #include "BatteryMeter.h"
 #include "DiskIOMeter.h"
+#include "ProcessLocksScreen.h"
 #include "SignalsPanel.h"
-#include <signal.h>
-#include <sys/mkdev.h>
-#include <sys/proc.h>
-#include <libproc.h>
+
 
 #define  kill(pid, signal) kill(pid / 1024, signal)
 
@@ -64,6 +69,10 @@ void Platform_setZfsCompressedArcValues(Meter* this);
 
 char* Platform_getProcessEnv(pid_t pid);
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
 bool Platform_getDiskIO(DiskIOData* data);
 
 bool Platform_getNetworkIO(unsigned long int *bytesReceived,
diff --git a/unsupported/Platform.c b/unsupported/Platform.c
index 3f8cefa6..4208b73c 100644
--- a/unsupported/Platform.c
+++ b/unsupported/Platform.c
@@ -141,6 +141,17 @@ char* Platform_getProcessEnv(pid_t pid) {
    return NULL;
 }
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode) {
+    (void)pid;
+    (void)inode;
+    return NULL;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+    (void)pid;
+    return NULL;
+}
+
 bool Platform_getDiskIO(DiskIOData* data) {
    (void)data;
    return false;
diff --git a/unsupported/Platform.h b/unsupported/Platform.h
index 902b6a9b..8ca201c1 100644
--- a/unsupported/Platform.h
+++ b/unsupported/Platform.h
@@ -11,6 +11,7 @@ in the source distribution for its full text.
 #include "Action.h"
 #include "BatteryMeter.h"
 #include "DiskIOMeter.h"
+#include "ProcessLocksScreen.h"
 #include "SignalsPanel.h"
 #include "UnsupportedProcess.h"
 
@@ -48,6 +49,10 @@ bool Process_isThread(const Process* this);
 
 char* Platform_getProcessEnv(pid_t pid);
 
+char* Platform_getInodeFilename(pid_t pid, ino_t inode);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
 bool Platform_getDiskIO(DiskIOData* data);
 
 bool Platform_getNetworkIO(unsigned long int *bytesReceived,