Testsuite: Add doc for PORT_DYNAMIC

1 files changed, 7 insertions, 2 deletions

diff --git a/test/README b/test/README
index 0d26488cb..485ce290d 100644
--- a/test/README
+++ b/test/README
@@ -122,10 +122,10 @@ In order to run this test suite, the following requirements must be met:
     with content .../exim/test/test-config [fill out the ... to make full
     paths].  This file should be owner/group matching CONFIGURE_OWNER/GROUP,
     or root/root, and it has to be accessible for the login, under which
-    you run the tests.  The config files in .../exim/test/confs/ should be 
+    you run the tests.  The config files in .../exim/test/confs/ should be
     owner/group the same.  DISABLE_D_OPTION must not be used. If ALT_CONFIG_PREFIX is used, it
     must contain the directory of the test-suite.  WHITELIST_D_MACROS should contain:
-    
+
      DIR:EXIM_PATH:AA:ACL:ACLRCPT:ACL_MAIL:ACL_PREDATA:ACL_RCPT:AFFIX:ALLOW:ARG1:ARG2:AUTHF:AUTHS:AUTH_ID_DOMAIN:BAD:BANNER:BB:BR:BRB:CERT:COM:COMMAND_USER:CONNECTCOND:CONTROL:CREQCIP:CREQMAC:CRL:CSS:D6:DATA:DCF:DDF:DEFAULTDWC:DELAY:DETAILS:DRATELIMIT:DYNAMIC_OPTION:ELI:ERROR_DETAILS:ERT:FAKE:FALLBACK:FILTER:FILTER_PREPEND_HOME:FORBID:FORBID_SMTP_CODE:FUSER:HAI:HAP:HARDLIMIT:HEADER_LINE_MAXSIZE:HEADER_MAXSIZE:HELO_MSG:HL:HOSTS:HOSTS_AVOID_TLS:HOSTS_MAX_TRY:HVH:IFACE:IGNORE_QUOTA:INC:INSERT:IP1:IP2:LAST:LDAPSERVERS:LENCHECK:LIMIT:LIST:LOG_SELECTOR:MAXNM:MESSAGE_LOGS:MSIZE:NOTDAEMON:ONCE:ONLY:OPT:OPTION:ORDER:PAH:PEX:PORT:PTBC:QDG:QOLL:QUOTA:QUOTA_FILECOUNT:QWM:RCPT_MSG:REMEMBER:REQUIRE:RETRY:RETRY1:RETRY2:RETURN:RETURN_ERROR_DETAILS:REWRITE:ROUTE_DATA:RRATELIMIT:SELECTOR:SELF:SERVER:SERVERS:SREQCIP:SREQMAC:SRV:STRICT:SUB:SUBMISSION_OPTIONS:TIMEOUTDEFER:TIMES:TRUSTED:TRYCLEAR:UL:USE_SENDER:UTF8:VALUE:WMF
 
 (10) Exim must *not* be built with USE_READLINE, as the test-suite's automation
@@ -551,6 +551,7 @@ here:
   PORT_D         is replaced by a port number for normal daemon use
   PORT_N         is replaced by a port number that should never respond
   PORT_S         is replaced by a port number for normal bin/server use
+  PORT_DYNAMIC   is replaced by a port number allocated dynamically
   TESTNUM        is replaced by the current test number
   V4NET          is replaced by an IPv4 network number for testing
   V6NET          is replaced by an IPv6 network number for testing
@@ -561,6 +562,10 @@ testing purposes, and for testing Exim with -bh. The only requirement is that
 they are networks that can never be used for an IP address of a real host. I've
 chosen two multicast networks for the moment.
 
+PORT_DYNAMIC is allocated by hunting for a free port (starting at port
+1024) a listener can bind to. This is done by runtest, for simulating
+inetd operations.
+
 If the host has no IPv6 address, "<no IPv6 address found>" is substituted but
 that does not matter because no IPv6 tests will be run. A similar substitution
 is made if there is no IPv4 address, and again, tests that actually require a