Remove echld/.

It has been unsupported for some years and when talking about removing it
in the past I received some positive and no negative feedback.

There is one instance of echld left:
capchild/capture_sync.c:                 * echld might have already reaped the child.

Can that case be removed or should be comment be updated to something more
accurate? (left for a separate patch)

Change-Id: Idac397158dd86fd0728eb95379449ee4a463fc28
Reviewed-on: https://code.wireshark.org/review/20619
Petri-Dish: Jörg Mayer <jmayer@loplof.de>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 0 insertions, 251 deletions

diff --git a/doc/README.epan_child b/doc/README.epan_child
deleted file mode 100644
index b77ae79c6e..0000000000
--- a/doc/README.epan_child
+++ /dev/null
@@ -1,251 +0,0 @@
-EPAN CHILDREN
-
-  This document is a work in progress.
-
-  This document describes a potential interface between a master process and one or more working children.
-  The goal is to have along-running epan process without the troubles of epan reinit (leaks, mis-reinits, ...).
-  Working children are spawn to capture or read files, then terminated.
-  The long running parent process initializes epan and forks children that require no further initialization to run.
-
-  epan_child.h in the root directory describes the C interface.
-
-
-Appendix A
-ECHLD PROTOCOL INTERACTION DIAGRAMS
-
-        parent            child            dumpcap
-          |                 |                 | 
-
-
-A.1. creation
-     new_child() ---------->|
-          |<-----HELLO------|
-                          IDLE
-
-
-A.2. keepalive
-A.2.1 p->c
-                        ANY_STATE
-          |-------PING----->|
-          |<------PONG------|
-                        SAME_STATE
-A.2.2 c->p
-                        ANY_STATE
-          |<------PING------|
-          |-------PONG----->|
-                        SAME_STATE
-
-
-A.3. destruction
-A.3.1 normal
-                        ANY_STATE
-          |---CLOSE_CHILD-->|
-          |<----CLOSING-----|
-                          DYING
-          |<-- SIG_CHLD
-     delete_child()
-
-A.3.2 fatal error
-                        ANY_STATE
-          |<-----ERROR------| (fatal_err,"reason")
-          |<---SIG_CHLD
-     delete_child()
-
-A.3.3 crash
-                        ANY_STATE
-          |<---SIG_CHLD
-     delete_child()
-
-
-
-A.4. getting current dir
-                        ANY_STATE
-          |-------PWD------>|
-          |<------CWD-------| (dirname)
-                        SAME_STATE
-
-
-A.5. changing current dir
-A.5.1 dir changed ok
-                        ANY_STATE
-          |------CHDIR----->| (dirname)
-          |<------CWD-------| (dirname)
-                        SAME_STATE
-A.5.2 dir changed ko
-                        ANY_STATE
-          |------CHDIR----->| (dirname)
-          |<-----ERROR------| (cannot_cd, "reason")
-                        SAME_STATE
-
-A.6. listing current directory
-A.6.1 file list ok
-                        ANY_STATE
-          |----LIST_FILES-->| ("*.*"")
-          |<---FILE_INFO----| (filename, format,  encap, num_pkts, ...);
-          |<---FILE_INFO----| (filename, format,  encap, num_pkts, ...);
-          .....
-          |<---FILE_INFO----| (filename, format,  encap, num_pkts, ...);
-                        SAME_STATE
-A.6.2 file list ko
-                        ANY_STATE
-          |----LIST_FILES-->| ("*.*"")
-          |<-----ERROR------| (no_files, "reason")
-                        SAME_STATE
-
-
-A.7. opening a file
-A.7.1 opened ok
-                            IDLE
-          |----OPEN_FILE---->| (filename, ...)
-          |<---FILE_OPENED---| (dirname)
-                          READING
-A.7.2 not opened
-                            IDLE
-          |----OPEN_FILE---->| (filename, ...)
-          |<-----ERROR-------| (cannot_open, "reason")
-                            IDLE
-
-
-A.8. saving a file
-A.8.1 save ok
-                    READING/CAPTURING/DONE
-          |-----SAVE_FILE---->| ("new_filename",opts,...)
-          |<----FILE_SAVED----| (24, tree)
-                          SAME_STATE
-
-A.8.1 save ko
-                    READING/CAPTURING/DONE
-          |-----SAVE_FILE---->| ("new_filename",opts,...)
-          |<------ERROR-------| (cannot_save, "reason")
-                          SAME_STATE
-
-
-A.9. listing interfaces
-A.9.1 intf list ok
-                              IDLE
-          |--LIST_INTERFACES-->| ("*.*"")
-          |                    |-------????------>|
-          |                    |<------????-------|
-          |<--INTERFACE_INFO---| (name, param1=val1, ...)
-          |<--INTERFACE_INFO---| (name, param1=val1, ...)
-          .....
-          |<--INTERFACE_INFO---| (name, param1=val1, ...)
-                              IDLE
-A.9.2 intf list ko
-          |--LIST_INTERFACES-->| ("*.*"")
-          |                    |-------????------>|
-          |                    |<------????-------|
-          |<------ERROR-------| (list_intf, "reason")
-
-
-A.10. opening an interface
-A.10.1 interface opened ok
-                              IDLE
-          |---OPEN_INTERFACE-->|
-          |                    |-------????------>|
-          |                    |<------????-------|
-          |<--INTERFACE_OPENED-|
-                              READY
-
-A.10.2 interface open failure
-                              IDLE
-          |--OPEN_INTERFACE--->|
-          |                    |-------????------>|
-          |                    |<------????-------|
-          |<-------ERROR-------| (intf, "reason")
-                              IDLE
-
-
-A.11. starting capture
-A.11.1 started capture ok
-                             READY
-          |---START_CAPTURE--->|
-          |                    |-------????------>|
-          |                    |<------????-------|
-          |<-CAPTURE_STARTED---|
-                             IN_CAPTURE
-A.11.2 capture start failure
-                             READY
-          |----START_CAPTURE-->|
-          |                    |-------????------>|
-          |                    |<------????-------|
-          |<-------ERROR-------| (cannot_start, "reason")
-                             READY
-
-A.12. capturing or reading
-                       IN_CAPTURE/READING
-          |                    |<------????-------|
-          |<----PACKET_SUM-----| (framenum, columns)
-                          IN_CAPTURE
-
-A.13 getting packet details
-A.13.1 just frame
-                       IN_CAPTURE/READING
-          |----GET_PACKETS--->| (framelist)
-          |<-----PACKET-------| (1, tree)
-          |<-----BUFFER-------| ("1", tvb)
-          |<-----PACKET-------| (2, tree)
-          |<-----BUFFER-------| ("2", tvb)
-                          SAME_STATE
-
-A.13.2 frame with reassembled buffer
-                       IN_CAPTURE/READING/DONE
-          |----GET_PACKETS--->| (framelist)
-          |<-----PACKET-------| (framenum, tree)
-          |<-----BUFFER-------| ("framenum", tvb)
-          |<-----BUFFER-------| ("reas_num", tvb)
-                          SAME_STATE
-
-
-A.13.3 frame with known reassembled buffer
-                       IN_CAPTURE/READING/DONE
-          |<-----PACKET-------| (framenum+N, tree)
-          |<-----BUFFER-------| ("framenum+N", tvb)
-          |<-----BUFFER-------| ("reas_num", NULL)
-                          SAME_STATE
-
-A.13.4 buffer request (e.g. un-cached buffer)
-                       IN_CAPTURE/READING/DONE
-          |------GET_BUF----->| (bufname)
-          |<-----BUFFER-------| (bufname, NULL)
-                          SAME_STATE
-
-A.14 stpping capture
-                          IN_CAPTURE
-          |---STOP_CAPTURE--->|
-          |<-CAPTURE_STOPPED--|
-                             DONE
-
-
-A.15. done reading
-                            READING
-                               |<-- EOF
-          |<--------EOF--------|
-                             DONE
-
-A.16 setting a note
-A.16.1 note set ok
-                       IN_CAPTURE/READING/DONE
-          |----ADD_NOTE------>| (framenum,note)
-          |<----NOTE_ADDED----|
-                          SAME_STATE
-A.16.2 note set failure
-                       IN_CAPTURE/READING/DONE
-          |----ADD_NOTE------>| (framenum,note)
-          |<----NOTE_ADDED----|
-                          SAME_STATE
-
-A.17 applying a filter
-                       IN_CAPTURE/READING/DONE
-          |---APPLY_FILTER--->| (dfilter_str)
-          |<---PACKET_LIST----| (Packet-Range)
-          |<---PACKET_LIST----| (Packet-Range)
-                          SAME_STATE
-
-
-A.18 setting a filter
-                             IDLE
-          |-----SET_FILTER---->| (dfilter_str)
-          |<---FILTER_SET------|
-                             IDLE
-