[Bug 16084] New: [patch] ps f (forest) support non-DESKTOP

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=16084

            Bug ID: 16084
           Summary: [patch] ps f (forest) support non-DESKTOP
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: d+busybox at adaptive-enterprises.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Created attachment 9748
  --> https://bugs.busybox.net/attachment.cgi?id=9748&action=edit
[PATCH] ps: add f option (process forest)

I wanted to see the process tree in a hierarchy in the way that procps shows
it.

The attached patch implements CONFIG_FEATURE_PS_FOREST. The output looks like
this (in part):

   1883 root      2892 S    {run-cupsd} /bin/sh
/snap/cups/1047/scripts/run-cupsd
   2104 root     69316 S     \_ cupsd -f -s
/var/snap/cups/common/etc/cups/cups-files.conf -c /var/snap/cups/common/
   2105 root      236m S     \_ cups-proxyd /var/snap/cups/common/run/cups.sock
/run/cups/cups.sock -l --logdir /var
   1908 root      116m S    {unattended-upgr} /usr/bin/python3
/usr/share/unattended-upgrades/unattended-upgrade-shu
   1929 root     1975m S    /usr/bin/containerd
   1969 colord    383m S    /usr/libexec/colord
   1977 root      2732 S    /usr/sbin/radvd --logmethod stderr_clean
   1978 root      2732 S     \_ /usr/sbin/radvd --logmethod stderr_clean
   1991 _chrony  19512 S    /usr/sbin/chronyd -F 1
   1992 _chrony  11208 S     \_ /usr/sbin/chronyd -F 1


Here is the bloatcheck

    function                                             old     new   delta
    forest_readdir                                         -    1037   +1037
    ps_main                                             1517    1833    +316
    static.de_ret                                          -     280    +280
    forest_layout_r                                        -     250    +250
    forest_bsearch                                         -     162    +162
    forest_proc_pidcmp                                     -      81     +81
    procps_scan                                         1592    1646     +54
    .rodata                                           120097  120137     +40
    free_procps_scan                                     113     130     +17
    top_main                                            2308    2320     +12
    mread_proc                                           203     212      +9
    pgrep_main                                          1289    1295      +6
    kill_main                                           1858    1864      +6
    packed_usage                                       34756   34760      +4
   
------------------------------------------------------------------------------
    (add/remove: 5/0 grow/shrink: 9/0 up/down: 2274/0)           Total: 2274
bytes
       text    data     bss     dec     hex filename
    1732374   16092    1808 1750274  1ab502 busybox_old
    1734368   16092    2088 1752548  1abde4 busybox_unstripped

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