Process: document process fields

Drop unused fields 'flags' and 'exit_signal'

Process.h

@@ -56,55 +56,131 @@ typedef enum ProcessField_ {
 struct Settings_;
 
 typedef struct Process_ {
+   /* Super object for emulated OOP */
    Object super;
 
+   /* Pointer to quasi-global data structures */
    const struct ProcessList_* processList;
    const struct Settings_* settings;
 
+   /* Process runtime (in hundredth of a second) */
    unsigned long long int time;
+
+   /* Process identifier */
    pid_t pid;
+
+   /* Parent process identifier */
    pid_t ppid;
+
+   /* Thread group identifier */
    pid_t tgid;
-   char* comm;  /* use Process_getCommand() for Command actually displayed */
-   int indent;
 
-   int basenameOffset;
-   bool updated;
-
-   char state;
-   bool tag;
-   bool showChildren;
-   bool show;
-   bool wasShown;
+   /* Process group identifier */
    unsigned int pgrp;
-   unsigned int session;
-   unsigned int tty_nr;
-   int tpgid;
-   uid_t st_uid;
-   unsigned long int flags;
-   int processor;
 
-   float percent_cpu;
-   float percent_mem;
+   /* Session identifier */
+   unsigned int session;
+
+   /* Foreground group identifier of the controlling terminal */
+   int tpgid;
+
+   /*
+    * Controlling terminal of the process.
+    * The minor device number is contained in the combination of bits 31 to 20 and 7 to 0; the major device number is in bits 15 to 8.
+    * */
+   unsigned int tty_nr;
+
+   /* User identifier */
+   uid_t st_uid;
+
+   /* User name */
    const char* user;
 
+   /*
+    * Process name including arguments.
+    * Use Process_getCommand() for Command actually displayed.
+    */
+   char* comm;
+
+   /* Offset in comm of the process basename */
+   int basenameOffset;
+
+   /* CPU number last executed on */
+   int processor;
+
+   /* CPU usage during last cycle (in percent) */
+   float percent_cpu;
+
+   /* Memory usage during last cycle (in percent) */
+   float percent_mem;
+
+   /* Scheduling priority */
    long int priority;
+
+   /* Nice value */
    long int nice;
+
+   /* Number of threads in this process */
    long int nlwp;
-   char starttime_show[8];
+
+   /* Process start time (in seconds elapsed since the Epoch) */
    time_t starttime_ctime;
 
+   /* Process start time (cached formatted string) */
+   char starttime_show[8];
+
+   /* Total program size (in kilobytes) */
    long m_virt;
+
+   /* Resident set size (in kilobytes) */
    long m_resident;
 
-   int exit_signal;
+   /* Number of minor faults the process has made which have not required loading a memory page from disk */
+   unsigned long int minflt;
 
+   /* Number of major faults the process has made which have required loading a memory page from disk */
+   unsigned long int majflt;
+
+   /*
+    * Process state (platform dependent):
+    *   D  -  Waiting
+    *   I  -  Idle
+    *   L  -  Acquiring lock
+    *   R  -  Running
+    *   S  -  Sleeping
+    *   T  -  Stopped (on a signal)
+    *   X  -  Dead
+    *   Z  -  Zombie
+    *   t  -  Tracing stop
+    *   ?  -  Unknown
+    */
+   char state;
+
+   /* Whether the process was updated during the current scan */
+   bool updated;
+
+   /* Whether the process was tagged by the user */
+   bool tag;
+
+   /* Whether to display this process */
+   bool show;
+
+   /* Whether this process was shown last cycle */
+   bool wasShown;
+
+   /* Whether to show children of this process in tree-mode */
+   bool showChildren;
+
+   /*
+    * Internal time counts for showing new and exited processes.
+    */
    time_t seenTs;
    time_t tombTs;
 
-   unsigned long int minflt;
-   unsigned long int majflt;
-
+   /*
+    * Internal state for tree-mode.
+    */
+   int indent;
    unsigned int tree_left;
    unsigned int tree_right;
    unsigned int tree_depth;
@@ -112,11 +188,22 @@ typedef struct Process_ {
 } Process;
 
 typedef struct ProcessFieldData_ {
+   /* Name (displayed in setup menu) */
    const char* name;
+
+   /* Title (display in main screen); must have same width as the printed values */
    const char* title;
+
+   /* Description (displayed in setup menu) */
    const char* description;
+
+   /* Scan flag to enable scan-method otherwise not run */
    uint32_t flags;
+
+   /* Whether the values are process identifies; adjusts the width of title and values if true */
    bool pidColumn;
+
+   /* Whether the column should be sorted in descending order by default */
    bool defaultSortDesc;
 } ProcessFieldData;
 

linux/LinuxProcessList.c

@@ -317,8 +317,10 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
    location += 1;
    process->tpgid = strtol(location, &location, 10);
    location += 1;
-   process->flags = strtoul(location, &location, 10);
-   location += 1;
+
+   /* Skip flags */
+   location = strchr(location, ' ') + 1;
+
    process->minflt = strtoull(location, &location, 10);
    location += 1;
    lp->cminflt = strtoull(location, &location, 10);
@@ -351,8 +353,10 @@ static bool LinuxProcessList_readStatFile(Process* process, openat_arg_t procFd,
    for (int i = 0; i < 15; i++) {
       location = strchr(location, ' ') + 1;
    }
-   process->exit_signal = strtol(location, &location, 10);
-   location += 1;
+
+   /* Skip exit_signal */
+   location = strchr(location, ' ') + 1;
+
    assert(location != NULL);
    process->processor = strtol(location, &location, 10);