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networkd: Don't try to close fd in sd_radv_stop if fd is closed. 

sd_radv_stop is called from two places. if sd_radv_stop is alrady
success then just don't try to close it .
```
systemd-networkd[604]: RADV: Stopping IPv6 Router Advertisement daemon
systemd-networkd[604]: RADV: Unable to send last Router Advertisement with router lifetime set to zero: Bad file descriptor <==================HERE
systemd-networkd[604]: RADV: Updated prefix 2a0a:*:*:fc::/64 preferred 1h valid 2h
systemd-networkd[604]: RADV: Started IPv6 Router Advertisement daemon
```

Closes one of the issue #8960
This commit is contained in:
Susant Sahani 2018-06-13 19:22:34 +05:30 committed by Zbigniew Jędrzejewski-Szmek
parent cb8770ed21
commit 6f8a8b84f2
1 changed files with 3 additions and 0 deletions
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3
src/libsystemd-network/sd-radv.c
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@ -352,6 +352,9 @@ _public_ int sd_radv_stop(sd_radv *ra) {
assert_return(ra, -EINVAL);
if (ra->state == SD_RADV_STATE_IDLE)
return 0;
log_radv("Stopping IPv6 Router Advertisement daemon");
/* RFC 4861, Section 6.2.5, send at least one Router Advertisement