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top: introduced new focus toggle ('F'), program source

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Sometimes, it might be useful to isolate a parent task
and its forked children from other system activity. As
an example, a user might want to examine workload in a
specific lxc container. Or maybe there is some need to
question what's happening under the same tmux session.

Since forest view mode tends to be a relatively stable
display, it will sometimes satisfy the above need. But
that mode can't currently guarantee the target process
always remains as the topmost task or even is visible.

So, this patch will enable focusing on any parent task
and keeping it as the topmost process while displaying
it and its forked children only. It then appears as if
there is no other activity in that system by virtue of
the blank lines which follow that final child process.

To implement this new feature, top's redundant 'F' key
has been repurposed. It made little sense devoting two
keys to the Fields Management screen (especially since
the key we've taken required two separate keystrokes).

[ and while we're at it, i also added punctuation to ]
[ that prologue for 'forest_display' since all other ]
[ forest functions used punctuation. And, instead of ]
[ a pointer to a proc_t he will now get a ppt index. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2021-07-28 00:00:00 -05:00
committed by Craig Small
parent 37f1060299
commit bdd50fa2fc
3 changed files with 70 additions and 28 deletions
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6
top/top.h
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@@ -438,6 +438,9 @@ typedef struct WIN_t {
int osel_tot; // total of other selection criteria
char *findstr; // window's current/active search string
int findlen; // above's strlen, without call overhead
int focus_pid; // target pid when 'F' toggle is active
int focus_beg; // ppt index where 'F' toggle has begun
int focus_end; // ppt index where 'F' toggle has ended
proc_t **ppt; // this window's proc_t ptr array
struct WIN_t *next, // next window in window stack
*prev; // prior window in window stack
@@ -789,7 +792,8 @@ typedef struct WIN_t {
//atic int forest_based (const proc_t **x, const proc_t **y);
#endif
//atic void forest_create (WIN_t *q);
//atic inline const char *forest_display (const WIN_t *q, const proc_t *p);
//atic inline const char *forest_display (const WIN_t *q, int idx);
//atic void forest_excluded (WIN_t *q);
/*------ Interactive Input Tertiary support ----------------------------*/
//atic inline int find_ofs (const WIN_t *q, const char *buf);
//atic void find_string (int ch);