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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 ]
[ the prologue for that renamed 'forest_display' guy ]
[ since all other forest functions used punctuation. ]

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2021-07-24 00:00:00 -05:00
committed by Craig Small
parent 8c2622aea8
commit 3e922e671d
3 changed files with 72 additions and 28 deletions
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6
top/top.h
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@@ -362,6 +362,9 @@ 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
struct pids_stack **ppt; // this window's stacks ptr array
struct WIN_t *next, // next window in window stack
*prev; // prior window in window stack
@@ -662,7 +665,8 @@ typedef struct WIN_t {
/*------ Forest View support -------------------------------------------*/
//atic void forest_adds (const int self, unsigned level);
//atic void forest_begin (WIN_t *q);
//atic inline const char *forest_colour (const WIN_t *q, struct pids_stack *p);
//atic void forest_config (WIN_t *q);
//atic inline const char *forest_display (const WIN_t *q, struct pids_stack *p);
/*------ Interactive Input Tertiary support ----------------------------*/
//atic inline int find_ofs (const WIN_t *q, const char *buf);
//atic void find_string (int ch);