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add library support for tuning TCP_KEEPALIVE

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This adds three new options to control the behavior of TCP keepalives:

- CURLOPT_TCP_KEEPALIVE: enable/disable probes
- CURLOPT_TCP_KEEPIDLE: idle time before sending first probe
- CURLOPT_TCP_KEEPINTVL: delay between successive probes

While not all operating systems support the TCP_KEEPIDLE and
TCP_KEEPINTVL knobs, the library will still allow these options to be
set by clients, silently ignoring the values.
This commit is contained in:
Dave Reisner
2012-01-24 01:28:06 +00:00
committed by Daniel Stenberg
parent ea055407fa
commit 705f0f7a5b
6 changed files with 82 additions and 0 deletions
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18
docs/libcurl/curl_easy_setopt.3
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@@ -915,6 +915,24 @@ overdone.
.IP CURLOPT_ADDRESS_SCOPE
Pass a long specifying the scope_id value to use when connecting to IPv6
link-local or site-local addresses. (Added in 7.19.0)
.IP CURLOPT_TCP_KEEPALIVE
Pass a long. If set to 1, TCP keepalive probes will be sent. The delay and
frequency of these probes can be controlled by the \fICURLOPT_TCP_KEEPIDLE\fP
and \fICURLOPT_TCP_KEEPINTVL\fP options, provided the operating system supports
them. Set to 0 (default behavior) to disable keepalive probes (Added in
7.24.1).
.IP CURLOPT_TCP_KEEPIDLE
Pass a long. Sets the delay, in seconds, that the operating system will wait
while the connection is idle before sending keepalive probes. Not all operating
systems support this option. (Added in 7.24.1)
.IP CURLOPT_TCP_KEEPINTVL
Pass a long. Sets the interval, in seconds, that the operating system will wait
between sending keepalive probes. Not all operating systems support this
option. (Added in 7.24.1)
.SH NAMES and PASSWORDS OPTIONS (Authentication)
.IP CURLOPT_NETRC
This parameter controls the preference of libcurl between using user names and