tests/server/tftpd.c: fix include and enhance debug logging

setjmp.h should only be included if HAVE_SETJMP_H is defined.

Add additional log statements to see wether reads and writes
are blocking or finishing before an alarm signal is received.

Assisted-by: Peter Wu
Part of #5364

tests/server/tftpd.c

@@ -78,7 +78,9 @@
 #include <sys/filio.h>
 #endif
 
+#ifdef HAVE_SETJMP_H
 #include <setjmp.h>
+#endif
 
 #ifdef HAVE_PWD_H
 #include <pwd.h>
@@ -1183,8 +1185,9 @@ static void sendtftp(struct testcase *test, struct formats *pf)
     }
 
     send_data:
+    logmsg("write");
     if(swrite(peer, sdp, size + 4) != size + 4) {
-      logmsg("write");
+      logmsg("write: fail");
       return;
     }
     read_ahead(test, pf->f_convert);
@@ -1192,7 +1195,9 @@ static void sendtftp(struct testcase *test, struct formats *pf)
 #ifdef HAVE_ALARM
       alarm(rexmtval);        /* read the ack */
 #endif
+      logmsg("read");
       n = sread(peer, &ackbuf.storage[0], sizeof(ackbuf.storage));
+      logmsg("read: %zd", n);
 #ifdef HAVE_ALARM
       alarm(0);
 #endif
@@ -1252,8 +1257,9 @@ static void recvtftp(struct testcase *test, struct formats *pf)
     (void) sigsetjmp(timeoutbuf, 1);
 #endif
 send_ack:
+    logmsg("write");
     if(swrite(peer, &ackbuf.storage[0], 4) != 4) {
-      logmsg("write: fail\n");
+      logmsg("write: fail");
       goto abort;
     }
     write_behind(test, pf->f_convert);
@@ -1261,14 +1267,16 @@ send_ack:
 #ifdef HAVE_ALARM
       alarm(rexmtval);
 #endif
+      logmsg("read");
       n = sread(peer, rdp, PKTSIZE);
+      logmsg("read: %zd", n);
 #ifdef HAVE_ALARM
       alarm(0);
 #endif
       if(got_exit_signal)
         goto abort;
       if(n < 0) {                       /* really? */
-        logmsg("read: fail\n");
+        logmsg("read: fail");
         goto abort;
       }
       rdp->th_opcode = ntohs((unsigned short)rdp->th_opcode);