request: on shutdown send, proceed normally on timeout

When ending an FTP upload, we shut down the connection gracefully, since
the server should be notified we had send all bytes. Mostl

request: on shutdown send, proceed normally on timeout

When ending an FTP upload, we shut down the connection gracefully, since
the server should be notified we had send all bytes. Mostly, this is a
NOP without TLS involved. With TLS, close-notify messages should be
exchanged.

As reported in #14843, not all servers seem to do that. Since it is the
server's responsiblity to check it has received everything, we just log
the timeout and proceed as if everything is fine.

In the receive direction, we still fail the transfer if the server does
not shut down its direction properly.

Fixes #14843
Reported-by: Rasmus Melchior Jacobsen
Closes #14848

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lib/src: white space edits to comply better with code style

... as checksrc now finds and complains about these.

Closes #14921

request: correctly reset the eos_sent flag

Add test cases

Bug: https://marc.info/?l=git&m=172620452502747&w=2
Reported-by: Patrick Steinhardt
Closes #14895

http2: when uploading data from stdin, fix eos forwarding

When uploading data from stdin ('-T -'), and the EOS was only detected
on a 0-length read, the EOS was not forwarded to the filt

http2: when uploading data from stdin, fix eos forwarding

When uploading data from stdin ('-T -'), and the EOS was only detected
on a 0-length read, the EOS was not forwarded to the filters. This led
HTTP/2 to hang on not forwarding this to the server.

Added test_07_14 to reproduce and verify.

Fixes #14870
Reported-by: nekopsykose on github
Closes #14877

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lib: use FMT_ as prefix instead of CURL_FORMAT_

For printf format defines used internally. Makes the code slighly
easier to read.

Closes #14764

getinfo: add CURLINFO_POSTTRANSFER_TIME_T

Returns the time, in microseconds, from the start until the last byte is
sent by libcurl (i.e. the request is sent off).

Closes #14189

hyper: call Curl_req_set_upload_done()

Hyper implementation was missing the call to Curl_req_set_upload_done()
as it works differently than out normal request upload handling.

C

hyper: call Curl_req_set_upload_done()

Hyper implementation was missing the call to Curl_req_set_upload_done()
as it works differently than out normal request upload handling.

Closes #14539

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urldata: introduce `data->mid`, a unique identifier inside a multi

`data->id` is unique in *most* situations, but not in all. If a libcurl
application uses more than one connection cache

urldata: introduce `data->mid`, a unique identifier inside a multi

`data->id` is unique in *most* situations, but not in all. If a libcurl
application uses more than one connection cache, they will overlap. This
is a rare situations, but libcurl apps do crazy things. However, for
informative things, like tracing, `data->id` is superior, since it
assigns new ids in curl's serial curl_easy_perform() use.

Introduce `data->mid` which is a unique identifer inside one multi
instance, assigned on multi_add_handle() and cleared on
multi_remove_handle().

Use the `mid` in DoH operations and also in h2/h3 stream hashes.

Reported-by: 罗朝辉
Fixes #14414
Closes #14499

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http/2: simplify eos/blocked handling

- rely on the new flush to handle blocked sends. No longer
do simulated EAGAIN on (partially) blocked sends with their
need to handle repeat

http/2: simplify eos/blocked handling

- rely on the new flush to handle blocked sends. No longer
do simulated EAGAIN on (partially) blocked sends with their
need to handle repeats.
- fix some debug handling CURL_SMALLREQSEND env var
- add some assertings in request.c for affirming we do it right
- enhance assertion output in test_16 for easier analysis

Closes #14435

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cfilters: send flush

Since data can be held in connection filter buffers when sending gives
EAGAIN, add methods to query this and perform flushing of those buffers.

The transfer

cfilters: send flush

Since data can be held in connection filter buffers when sending gives
EAGAIN, add methods to query this and perform flushing of those buffers.

The transfer loop will continue sending until all upload data is
processed and the connection is flushed.

- add `CF_QUERY_SEND_PENDING` to query filters
- add `CF_CTRL_DATA_SEND_FLUSH` to flush filters
- change `Curl_req_want_send()` to query the connection
if it needs flushing
- use `Curl_req_want_send()` to determine the POLLOUT
in the PERFORMING multi state
- implement flush handling in the HTTP/2 connection filter

Closes #14271

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lib: add eos flag to send methods

Adds a `bool eos` flag to send methods to indicate that the data
is the last chunk the invovled transfer wants to send to the server.

This will

lib: add eos flag to send methods

Adds a `bool eos` flag to send methods to indicate that the data
is the last chunk the invovled transfer wants to send to the server.

This will help protocol filters like HTTP/2 and 3 to forward the
stream's EOF flag and also allow to EAGAIN such calls when buffers
are not yet fully flushed.

Closes #14220

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Revert "lib: send eos flag"

This reverts commit be93299f10ef0b2bf7fe5c82140120073831867a.

lib: send eos flag

Adds a `bool eos` flag to send methods to indicate that the data is the
last chunk the invovled transfer wants to send to the server.

This will help protocol

lib: send eos flag

Adds a `bool eos` flag to send methods to indicate that the data is the
last chunk the invovled transfer wants to send to the server.

This will help protocol filters like HTTP/2 and 3 to forward the
stream's EOF flag and also allow to EAGAIN such calls when buffers are
not yet fully flushed.

Closes #14220

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doh: fix cleanup

When removing an easy handle that had DoH sub-easy handles going, those
were not removed from the multi handle. Their memory was reclaimed on
curl_easy_cleanup() of

doh: fix cleanup

When removing an easy handle that had DoH sub-easy handles going, those
were not removed from the multi handle. Their memory was reclaimed on
curl_easy_cleanup() of the owning handle, but multi still had them in
their list.

Add `Curl_doh_close()` and `Curl_doh_cleanup()` as common point for
handling the DoH resource management. Use the `multi` present in the doh
handles (if so), for removal, as the `data->multi` might already have
been NULLed at this time.

Reported-by: 罗朝辉
Fixes #14207
Closes #14212

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code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname

code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname
- file name => filename
- user name = username
- man page => manpage
- run-time => runtime
- set-up => setup
- back-end => backend
- a HTTP => an HTTP
- Two spaces after a period => one space after period

Closes #14073

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request: change the struct field bodywrites to a bool, only for hyper

Only hyper needs to know this, and it can use it as a boolean.

Closes #13928

http: remove "struct HTTP"

It is not actually used anymore and only contained a dummy struct field.
Remove all traces and uses of it.

Closes #13927

lib: xfer_setup and non-blocking shutdown

- clarify Curl_xfer_setup() with RECV/SEND flags and different calls for
which socket they operate on. Add a shutdown flag for secondary

lib: xfer_setup and non-blocking shutdown

- clarify Curl_xfer_setup() with RECV/SEND flags and different calls for
which socket they operate on. Add a shutdown flag for secondary
sockets
- change Curl_xfer_setup() calls to new functions
- implement non-blocking connection shutdown at the end of receiving or
sending a transfer

Closes #13913

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build: untangle `CURLDEBUG` and `DEBUGBUILD` macros

`CURLDEBUG` is meant to enable memory tracking, but in a bunch of cases,
it was protecting debug features that were supposed to be gua

build: untangle `CURLDEBUG` and `DEBUGBUILD` macros

`CURLDEBUG` is meant to enable memory tracking, but in a bunch of cases,
it was protecting debug features that were supposed to be guarded with
`DEBUGBUILD`.

Replace these uses with `DEBUGBUILD`.

This leaves `CURLDEBUG` uses solely for its intended purpose: to enable
the memory tracking debug feature.

Also:
- autotools: rely on `DEBUGBUILD` to enable `checksrc`.
Instead of `CURLDEBUG`, which worked in most cases because debug
builds enable `CURLDEBUG` by default, but it's not accurate.
- include `lib/easyif.h` instead of keeping a copy of a declaration.
- add CI test jobs for the build issues discovered.

Ref: https://github.com/curl/curl/pull/13694#issuecomment-2120311894
Closes #13718

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request: make Curl_req_init return void

Since it could not return error and therefore this change removes dead
code for the caller.

Spotted by CodeSonar.

Closes #13423

lib: add Curl_xfer_write_resp_hd

Add method in protocol handlers to allow writing of a single,
0-terminated header line. Avoids parsing and copying these lines.

Closes #13165

request: paused upload on completed download, assess connection

A transfer with a completed download that is still uploading needs to
check the connection state when it is PAUSEd, since

request: paused upload on completed download, assess connection

A transfer with a completed download that is still uploading needs to
check the connection state when it is PAUSEd, since connection
close/errors would otherwise go unnoticed.

Reported-by: Sergey Bronnikov
Fixes #13260
Closes #13271

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http: improve response header handling, save cpu cycles

Saving some cpu cycles in http response header processing:
- pass the length of the header line along
- use string constant si

http: improve response header handling, save cpu cycles

Saving some cpu cycles in http response header processing:
- pass the length of the header line along
- use string constant sizeof() instead of strlen()
- check line length if prefix is possible
- switch on first header char to limit checks

Closes #13143

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http: expect 100 rework

Move all handling of HTTP's `Expect: 100-continue` feature into a client
reader. Add sending flag `KEEP_SEND_TIMED` that triggers transfer
sending on general

http: expect 100 rework

Move all handling of HTTP's `Expect: 100-continue` feature into a client
reader. Add sending flag `KEEP_SEND_TIMED` that triggers transfer
sending on general events like a timer.

HTTP installs a `CURL_CR_PROTOCOL` reader when announcing `Expect:
100-continue`. That reader works as follows:

- on first invocation, records time, starts the `EXPIRE_100_TIMEOUT`
timer, disables `KEEP_SEND`, enables `KEEP_SEND_TIMER` and returns 0,
eos=FALSE like a paused upload.

- on subsequent invocation it checks if the timer has expired. If so, it
enables `KEEP_SEND` and switches to passing through reads to the
underlying readers.

Transfer handling's `readwrite()` will be invoked when a timer expires
(like `EXPIRE_100_TIMEOUT`) or when data from the server arrives. Seeing
`KEEP_SEND_TIMER`, it will try to upload more data, which triggers
reading from the client readers again. Which then may lead to a new
pausing or cause the upload to start.

Flags and timestamps connected to this have been moved from
`SingleRequest` into the reader's context.

Closes #13110

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lib: move 'done' parameter to SingleRequests

A transfer may do several `SingleRequest`s for its success. This happens
regularly for authentication, follows and retries on failed connecti

lib: move 'done' parameter to SingleRequests

A transfer may do several `SingleRequest`s for its success. This happens
regularly for authentication, follows and retries on failed connections.
The "readwrite()" calls and functions connected to those carried a `bool
*done` parameter to indicate that the current `SingleRequest` is over.
This may happen before `upload_done` or `download_done` bits of
`SingleRequest` are set.

The problem with that is now `write_resp()` protocol handlers are
invoked in places where the `bool *done` cannot be passed up to the
caller. Instead of being a bool in the call chain, it needs to become a
member of `SingleRequest`, reflecting its state.

This removes the `bool *done` parameter and adds the `done` bit to
`SingleRequest` instead. It adds `Curl_req_soft_reset()` for using a
`SingleRequest` in a follow up, clearing `done` and other
flags/counters.

Closes #13096

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