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lib: replace getsock() logic with pollsets

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`getsock()` calls operated on a global limit that could
not be configure beyond 16 sockets. This is no longer adequate
with the new happy eyeballing strategy.

Instead, do the following:
- make `struct easy_pollset` dynamic. Starting with
  a minimal room for two sockets, the very common case,
  allow it to grow on demand.
- replace all protocol handler getsock() calls with pollsets
  and a CURLcode to return failures
- add CURLcode return for all connection filter `adjust_pollset()`
  callbacks, since they too can now fail.
- use appropriately in multi.c and multi_ev.c
- fix unit2600 to trigger pollset growth

Closes #18164
This commit is contained in:
Stefan Eissing 2025-08-04 16:17:37 +02:00 • committed by Daniel Stenberg
parent c85c2b7be7
commit 5b80b4c012
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54 changed files with 1002 additions and 873 deletions
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16
lib/openldap.c
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@ -126,10 +126,10 @@ const struct Curl_handler Curl_handler_ldap = {
oldap_connect, /* connect_it */
oldap_connecting, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* proto_pollset */
ZERO_NULL, /* doing_pollset */
ZERO_NULL, /* domore_pollset */
ZERO_NULL, /* perform_pollset */
oldap_disconnect, /* disconnect */
ZERO_NULL, /* write_resp */
ZERO_NULL, /* write_resp_hd */
@ -156,10 +156,10 @@ const struct Curl_handler Curl_handler_ldaps = {
oldap_connect, /* connect_it */
oldap_connecting, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* proto_pollset */
ZERO_NULL, /* doing_pollset */
ZERO_NULL, /* domore_pollset */
ZERO_NULL, /* perform_pollset */
oldap_disconnect, /* disconnect */
ZERO_NULL, /* write_resp */
ZERO_NULL, /* write_resp_hd */