#=> system_profiler SPHardwareDataType SPSoftwareDataType
 Hardware:
       Model Name: Mac mini
       Model Identifier: Macmini2,1
       Processor Name: Intel Core 2 Duo
 Software:
       System Version: Mac OS X 10.6.8 (10K549)
       Kernel Version: Darwin 10.8.0

So, I've got samba 4.15.3 to compile & install

Now, when I'm trying to run it I get :

smbd version 4.15.3 started.
 Copyright Andrew Tridgell and the Samba Team 1992-2021
 INFO: Profiling support unavailable in this build.
 daemon_status: daemon 'smbd' : Starting process ...
 tdbsam_open: Converting version 0.0 database to version 4.0.
 tdbsam_convert_backup: updated /opt/local/var/lib/samba/private/secrets.tdb file.
 set_maxfiles: setrlimit for RLIMIT_NOFILE for 16424 files failed with error Invalid argument

 Terminated

When I search the source for this, I get :

#=> grep -Rn RLIMIT_NOFILE *
 python/samba/netcmd/user.py:2674:            maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
 script/autobuild.py:1408:    maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
 source3/lib/util.c:1279:#if (defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE))
 source3/lib/util.c:1283:        if(getrlimit(RLIMIT_NOFILE, &rlp)) {
 source3/lib/util.c:1284:                DEBUG(0,("set_maxfiles: getrlimit (1) for RLIMIT_NOFILE failed with error %s\n",
 source3/lib/util.c:1311:                if(setrlimit(RLIMIT_NOFILE, &rlp)) {
 source3/lib/util.c:1312:                        DEBUG(3,("set_maxfiles: setrlimit for RLIMIT_NOFILE for %d max files failed with error %s\n",
 source3/lib/util.c:1325:        if(setrlimit(RLIMIT_NOFILE, &rlp)) {
 source3/lib/util.c:1326:                DEBUG(0,("set_maxfiles: setrlimit for RLIMIT_NOFILE for %d files failed with error %s\n",
 source3/lib/util.c:1332:        if(getrlimit(RLIMIT_NOFILE, &rlp)) {
 source3/lib/util.c:1333:                DEBUG(0,("set_maxfiles: getrlimit (2) for RLIMIT_NOFILE failed with error %s\n",
 source3/lib/util.c:1348:#else /* !defined(HAVE_GETRLIMIT) || !defined(RLIMIT_NOFILE) */
 source3/param/loadparm.c:301:#if (defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE))
 source3/param/loadparm.c:307:           if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
 source4/heimdal/lib/roken/getdtablesize.c:71:#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
 source4/heimdal/lib/roken/getdtablesize.c:73:  if (getrlimit(RLIMIT_NOFILE, &res) == 0)

 So, it looks as if it's {{{source3/lib/util.c:1326}}} that's the issue

 Any ideas as to how I can fix this ?!?

Comment (by jmroot):

 Setting RLIMIT_NOFILE to a value greater than OPEN_MAX will fail. So
the value passed to setrlimit needs to be capped at OPEN_MAX.

https://trac.macports.org/ticket/64403
https://trac.macports.org/ticket/64396