fork/exec implementation (#ce66485e) fails on OpenBSD

Initiating a connection using openconnect to ocserv-1.1.0 on OpenBSD fails:

$ openconnect 127.0.0.1      
POST https://127.0.0.1/
Connected to 127.0.0.1:443
SSL negotiation with 127.0.0.1
SSL connection failure: Error in the pull function.
Failed to open HTTPS connection to 127.0.0.1
Failed to obtain WebVPN cookie

Which seems related to two messages in message.log:

Jun 17 13:12:29 zeus ocserv[75617]: main: main.c:1116: readlink failed Undefined error: 0

Jun 17 14:19:41 zeus ocserv: error connecting to sec-mod socket '/var/run/ocserv-socket.dbd846af': No such file or directory

The first issue is caused by ocserv trying to get the full path of the executable by using readlink on /proc/self/exe (src/main.c#L1114). OpenBSD does not support procfs nor is it possible to get the full path of the executable for a process, as this is considered a security/privacy concern.

src/main.c#L1114 has been introduced as part of the new fork/exec implementation (#ce66485e from @Alan_Jowett).

The second issue I do not understand as the socket seems to be temporarily on the system:

$ ls -ltra /var/run/ocserv* 
srwx--x--x  1 nobody  daemon  0 Jun 17 14:49 /var/run/ocserv-socket.dbd846af

First issue can be easily by using argv[0]. Any idea where to look for the second issue?