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Clamp TCP_KEEPINTVL and simplify TCP_KEEPALIVE_ABORT_THRESHOLD on Solaris (#292)

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The time between each consequent probes is set by TCP_KEEPINTVL in
seconds. The minimum value is ten seconds. The maximum is ten days,
while the default is two hours. The TCP connection will be aborted after
certain amount of probes, which is set by TCP_KEEPCNT, without receiving
response.

## References
[Solaris
11.4](https://docs.oracle.com/cd/E88353_01/html/E37851/tcp-4p.html)

Signed-off-by: Andy Pan <i@andypan.me>
This commit is contained in:
Andy Pan 2024-04-15 12:53:07 +08:00 committed by GitHub
parent a4da212f11
commit fc5bf6a0ef
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1 changed files with 2 additions and 3 deletions
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src/anet.c
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@ -194,6 +194,7 @@ int anetKeepAlive(char *err, int fd, int interval)
}
intvl = idle/3;
if (intvl < 10) intvl = 10; /* kernel expects at least 10 seconds */
if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &intvl, sizeof(intvl))) {
anetSetError(err, "setsockopt TCP_KEEPINTVL: %s\n", strerror(errno));
return ANET_ERR;
@ -216,9 +217,7 @@ int anetKeepAlive(char *err, int fd, int interval)
/* Note that the consequent probes will not be sent at equal intervals on Solaris,
* but will be sent using the exponential backoff algorithm. */
intvl = idle/3;
cnt = 3;
int time_to_abort = intvl * cnt;
int time_to_abort = idle;
if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE_ABORT_THRESHOLD, &time_to_abort, sizeof(time_to_abort))) {
anetSetError(err, "setsockopt TCP_KEEPCNT: %s\n", strerror(errno));
return ANET_ERR;