diff --git a/test/unit/util.c b/test/unit/util.c
index 052eb31..e5c9b08 100644
--- a/test/unit/util.c
+++ b/test/unit/util.c
@@ -21,16 +21,28 @@
 #include <util.c>
 #include "test.h"
 
-void test_unit(void) {
+static volatile int handled_signal = 0;
+
+static void
+handle_signal(int signal)
+{
+  handled_signal = signal;
+}
+
+void
+test_unit(void)
+{
+  struct timespec ts, ts2, ts3, ts4;
+  char buf[16], *s, *s2, *words[3];
   NTP_int64 ntp_ts, ntp_fuzz;
   NTP_int32 ntp32_ts;
-  struct timespec ts, ts2;
   struct timeval tv;
   double x, y, nan, inf;
+  IPAddr ip, ip2, ip3;
+  IPSockAddr ip_saddr;
   Timespec tspec;
   Float f;
   int i, j, c;
-  char buf[16], *s, *words[3];
   uid_t uid;
   gid_t gid;
   struct stat st;
@@ -58,11 +70,6 @@ void test_unit(void) {
     TEST_CHECK(x > 0.0 || x <= 0.0);
   }
 
-  for (i = 0; i < 100000; i++) {
-    UTI_GetRandomBytes(&ntp32_ts, sizeof (ntp32_ts));
-    TEST_CHECK(UTI_DoubleToNtp32(UTI_Ntp32ToDouble(ntp32_ts)) == ntp32_ts);
-  }
-
   TEST_CHECK(UTI_DoubleToNtp32(1.0) == htonl(65536));
   TEST_CHECK(UTI_DoubleToNtp32(0.0) == htonl(0));
   TEST_CHECK(UTI_DoubleToNtp32(1.0 / (65536.0)) == htonl(1));
@@ -122,12 +129,71 @@ void test_unit(void) {
   TEST_CHECK(ntp_ts.hi == htonl(JAN_1970 + 1));
   TEST_CHECK(ntp_ts.lo == ntp_fuzz.lo);
 
-  ts.tv_sec = ts.tv_nsec = 0;
+  ts.tv_sec = ts.tv_nsec = 1;
+  UTI_ZeroTimespec(&ts);
+  TEST_CHECK(ts.tv_sec == 0);
+  TEST_CHECK(ts.tv_nsec == 0);
+  TEST_CHECK(UTI_IsZeroTimespec(&ts));
+
+  ntp_ts.hi = ntp_ts.lo == 1;
+  UTI_ZeroNtp64(&ntp_ts);
+  TEST_CHECK(ntp_ts.hi == 0);
+  TEST_CHECK(ntp_ts.lo == 0);
+
+  tv.tv_sec = tv.tv_usec = 1;
+  UTI_TimevalToTimespec(&tv, &ts);
+  TEST_CHECK(ts.tv_sec == 1);
+  TEST_CHECK(ts.tv_nsec == 1000);
+
+  UTI_TimespecToTimeval(&ts, &tv);
+  TEST_CHECK(tv.tv_sec == 1);
+  TEST_CHECK(tv.tv_usec == 1);
+
+  ts.tv_sec = 1;
+  ts.tv_nsec = 500000000;
+  TEST_CHECK(UTI_TimespecToDouble(&ts) == 1.5);
+
+  UTI_DoubleToTimespec(2.75, &ts);
+  TEST_CHECK(ts.tv_sec == 2);
+  TEST_CHECK(ts.tv_nsec == 750000000);
+
+  ts.tv_sec = 1;
+  ts.tv_nsec = 1200000000;
+  UTI_NormaliseTimespec(&ts);
+  TEST_CHECK(ts.tv_sec == 2);
+  TEST_CHECK(ts.tv_nsec == 200000000);
+
+  ts.tv_sec = 1;
+  ts.tv_nsec = -200000000;
+  UTI_NormaliseTimespec(&ts);
+  TEST_CHECK(ts.tv_sec == 0);
+  TEST_CHECK(ts.tv_nsec == 800000000);
+
+  tv.tv_sec = 1;
+  tv.tv_usec = 500000;
+  TEST_CHECK(UTI_TimevalToDouble(&tv) == 1.5);
+
+  UTI_DoubleToTimeval(2.75, &tv);
+  TEST_CHECK(tv.tv_sec == 2);
+  TEST_CHECK(tv.tv_usec == 750000);
+
+  tv.tv_sec = 1;
+  tv.tv_usec = 1200000;
+  UTI_NormaliseTimeval(&tv);
+  TEST_CHECK(tv.tv_sec == 2);
+  TEST_CHECK(tv.tv_usec == 200000);
+
+  tv.tv_sec = 1;
+  tv.tv_usec = -200000;
+  UTI_NormaliseTimeval(&tv);
+  TEST_CHECK(tv.tv_sec == 0);
+  TEST_CHECK(tv.tv_usec == 800000);
+
+  UTI_ZeroTimespec(&ts);
   UTI_TimespecToNtp64(&ts, &ntp_ts, &ntp_fuzz);
   TEST_CHECK(ntp_ts.hi == 0);
   TEST_CHECK(ntp_ts.lo == 0);
 
-  TEST_CHECK(UTI_IsZeroTimespec(&ts));
   TEST_CHECK(UTI_IsZeroNtp64(&ntp_ts));
 
   ts.tv_sec = 1;
@@ -194,6 +260,221 @@ void test_unit(void) {
   TEST_CHECK(UTI_CompareTimespecs(&ts, &ts2) < 0);
   TEST_CHECK(UTI_CompareTimespecs(&ts2, &ts) > 0);
 
+  ts.tv_sec = 2;
+  ts.tv_nsec = 250000000;
+  ts2.tv_sec = 1;
+  ts2.tv_nsec = 750000000;
+  UTI_DiffTimespecs(&ts3, &ts, &ts2);
+  TEST_CHECK(ts3.tv_sec == 0);
+  TEST_CHECK(ts3.tv_nsec == 500000000);
+  TEST_CHECK(UTI_DiffTimespecsToDouble(&ts, &ts2) == 0.5);
+
+  ts.tv_sec = 2;
+  ts.tv_nsec = 250000000;
+  ts2.tv_sec = 3;
+  ts2.tv_nsec = 750000000;
+  UTI_DiffTimespecs(&ts3, &ts, &ts2);
+  TEST_CHECK(ts3.tv_sec == -2);
+  TEST_CHECK(ts3.tv_nsec == 500000000);
+  TEST_CHECK(UTI_DiffTimespecsToDouble(&ts, &ts2) == -1.5);
+
+  ts.tv_sec = 2;
+  ts.tv_nsec = 250000000;
+  UTI_AddDoubleToTimespec(&ts, 2.5, &ts2);
+  TEST_CHECK(ts2.tv_sec == 4);
+  TEST_CHECK(ts2.tv_nsec == 750000000);
+
+  ts.tv_sec = 4;
+  ts.tv_nsec = 500000000;
+  ts2.tv_sec = 1;
+  ts2.tv_nsec = 750000000;
+  UTI_AverageDiffTimespecs(&ts, &ts2, &ts3, &x);
+  TEST_CHECK(ts3.tv_sec == 3);
+  TEST_CHECK(ts3.tv_nsec == 125000000);
+  TEST_CHECK(x == -2.75);
+
+  ts.tv_sec = 4;
+  ts.tv_nsec = 500000000;
+  ts2.tv_sec = 1;
+  ts2.tv_nsec = 750000000;
+  ts3.tv_sec = 5;
+  ts3.tv_nsec = 250000000;
+  UTI_AddDiffToTimespec(&ts, &ts2, &ts3, &ts4);
+  TEST_CHECK(ts4.tv_sec == 8);
+  TEST_CHECK(ts4.tv_nsec == 0);
+
+  ts.tv_sec = 1600000000;
+  ts.tv_nsec = 123;
+  s = UTI_TimespecToString(&ts);
+  TEST_CHECK(strcmp(s, "1600000000.000000123") == 0);
+
+  ntp_ts.hi = 1;
+  ntp_ts.hi = 2;
+  UTI_Ntp64ToTimespec(&ntp_ts, &ts);
+  s = UTI_Ntp64ToString(&ntp_ts);
+  s2 = UTI_TimespecToString(&ts);
+  TEST_CHECK(strcmp(s, s2) == 0);
+
+  s = UTI_RefidToString(0x41424344);
+  TEST_CHECK(strcmp(s, "ABCD") == 0);
+
+  ip.family = IPADDR_UNSPEC;
+  s = UTI_IPToString(&ip);
+  TEST_CHECK(strcmp(s, "[UNSPEC]") == 0);
+  TEST_CHECK(UTI_IPToRefid(&ip) == 0);
+  TEST_CHECK(UTI_IPToHash(&ip) == UTI_IPToHash(&ip));
+
+  ip.family = IPADDR_INET4;
+  ip.addr.in4 = 0x7f010203;
+  s = UTI_IPToString(&ip);
+  TEST_CHECK(strcmp(s, "127.1.2.3") == 0);
+  TEST_CHECK(UTI_IPToRefid(&ip) == 0x7f010203);
+  TEST_CHECK(UTI_IPToHash(&ip) == UTI_IPToHash(&ip));
+
+  ip.family = IPADDR_INET6;
+  memset(&ip.addr.in6, 0, sizeof (ip.addr.in6));
+  ip.addr.in6[0] = 0xab;
+  ip.addr.in6[15] = 0xcd;
+  s = UTI_IPToString(&ip);
+#ifdef FEAT_IPV6
+  TEST_CHECK(strcmp(s, "ab00::cd") == 0);
+#else
+  TEST_CHECK(strcmp(s, "ab00:0000:0000:0000:0000:0000:0000:00cd") == 0);
+#endif
+  TEST_CHECK(UTI_IPToRefid(&ip) == 0x5f9aa602);
+  TEST_CHECK(UTI_IPToHash(&ip) == UTI_IPToHash(&ip));
+
+  ip.family = IPADDR_ID;
+  ip.addr.id = 12345;
+  s = UTI_IPToString(&ip);
+  TEST_CHECK(strcmp(s, "ID#0000012345") == 0);
+  TEST_CHECK(UTI_IPToRefid(&ip) == 0);
+  TEST_CHECK(UTI_IPToHash(&ip) == UTI_IPToHash(&ip));
+
+  ip.family = IPADDR_UNSPEC + 10;
+  s = UTI_IPToString(&ip);
+  TEST_CHECK(strcmp(s, "[UNKNOWN]") == 0);
+  TEST_CHECK(UTI_IPToRefid(&ip) == 0);
+  TEST_CHECK(UTI_IPToHash(&ip) == UTI_IPToHash(&ip));
+
+  TEST_CHECK(UTI_StringToIP("200.4.5.6", &ip));
+  TEST_CHECK(ip.family == IPADDR_INET4);
+  TEST_CHECK(ip.addr.in4 == 0xc8040506);
+
+#ifdef FEAT_IPV6
+  TEST_CHECK(UTI_StringToIP("1234::7890", &ip));
+  TEST_CHECK(ip.family == IPADDR_INET6);
+  TEST_CHECK(ip.addr.in6[0] == 0x12 && ip.addr.in6[1] == 0x34);
+  TEST_CHECK(ip.addr.in6[2] == 0x00 && ip.addr.in6[13] == 0x00);
+  TEST_CHECK(ip.addr.in6[14] == 0x78 && ip.addr.in6[15] == 0x90);
+#else
+  TEST_CHECK(!UTI_StringToIP("1234::7890", &ip));
+#endif
+
+  TEST_CHECK(!UTI_StringToIP("ID#0000012345", &ip));
+
+  TEST_CHECK(UTI_IsStringIP("1.2.3.4"));
+  TEST_CHECK(!UTI_IsStringIP("127.3.3"));
+  TEST_CHECK(!UTI_IsStringIP("127.3"));
+  TEST_CHECK(!UTI_IsStringIP("127"));
+#ifdef FEAT_IPV6
+  TEST_CHECK(UTI_IsStringIP("1234:5678::aaaa"));
+#else
+  TEST_CHECK(!UTI_IsStringIP("1234:5678::aaaa"));
+#endif
+  TEST_CHECK(!UTI_StringToIP("ID#0000012345", &ip));
+
+  TEST_CHECK(!UTI_StringToIdIP("1.2.3.4", &ip));
+  TEST_CHECK(UTI_StringToIdIP("ID#0000056789", &ip));
+  TEST_CHECK(ip.family == IPADDR_ID);
+  TEST_CHECK(ip.addr.id == 56789);
+
+  for (i = IPADDR_UNSPEC; i <= IPADDR_ID + 1; i++) {
+    ip.family = i;
+    TEST_CHECK(UTI_IsIPReal(&ip) == (i == IPADDR_INET4 || i == IPADDR_INET6));
+  }
+
+  ip.family = IPADDR_UNSPEC;
+  UTI_IPHostToNetwork(&ip, &ip2);
+  TEST_CHECK(ip2.family == htons(IPADDR_UNSPEC));
+  UTI_IPNetworkToHost(&ip2, &ip3);
+  TEST_CHECK(ip3.family == IPADDR_UNSPEC);
+
+  ip.family = IPADDR_INET4;
+  ip.addr.in4 = 0x12345678;
+  UTI_IPHostToNetwork(&ip, &ip2);
+  TEST_CHECK(ip2.family == htons(IPADDR_INET4));
+  TEST_CHECK(ip2.addr.in4 == htonl(0x12345678));
+  UTI_IPNetworkToHost(&ip2, &ip3);
+  TEST_CHECK(ip3.family == IPADDR_INET4);
+  TEST_CHECK(ip3.addr.in4 == 0x12345678);
+
+  ip.family = IPADDR_INET6;
+  for (i = 0; i < 16; i++)
+    ip.addr.in6[i] = i;
+  UTI_IPHostToNetwork(&ip, &ip2);
+  TEST_CHECK(ip2.family == htons(IPADDR_INET6));
+  for (i = 0; i < 16; i++)
+    TEST_CHECK(ip.addr.in6[i] == i);
+  UTI_IPNetworkToHost(&ip2, &ip3);
+  TEST_CHECK(ip3.family == IPADDR_INET6);
+  for (i = 0; i < 16; i++)
+    TEST_CHECK(ip.addr.in6[i] == i);
+
+  ip.family = IPADDR_ID;
+  ip.addr.in4 = 0x87654321;
+  UTI_IPHostToNetwork(&ip, &ip2);
+  TEST_CHECK(ip2.family == htons(IPADDR_ID));
+  TEST_CHECK(ip2.addr.in4 == htonl(0x87654321));
+  UTI_IPNetworkToHost(&ip2, &ip3);
+  TEST_CHECK(ip3.family == IPADDR_ID);
+  TEST_CHECK(ip3.addr.in4 == 0x87654321);
+
+  for (i = 0; i < 16; i++)
+    ip.addr.in6[i] = 0x80;
+  ip2 = ip;
+
+  for (i = IPADDR_UNSPEC; i <= IPADDR_ID; i++) {
+    ip.family = i;
+    ip2.family = i + 1;
+    TEST_CHECK(UTI_CompareIPs(&ip, &ip2, NULL) < 0);
+    TEST_CHECK(UTI_CompareIPs(&ip2, &ip, NULL) > 0);
+    ip2 = ip;
+    ip2.addr.in4++;
+    if (i == IPADDR_UNSPEC) {
+      TEST_CHECK(UTI_CompareIPs(&ip, &ip2, NULL) == 0);
+      TEST_CHECK(UTI_CompareIPs(&ip, &ip2, &ip) == 0);
+    } else {
+      TEST_CHECK(UTI_CompareIPs(&ip, &ip2, NULL) < 0);
+      TEST_CHECK(UTI_CompareIPs(&ip2, &ip, NULL) > 0);
+      if (i == IPADDR_ID) {
+        TEST_CHECK(UTI_CompareIPs(&ip, &ip2, &ip) < 0);
+        TEST_CHECK(UTI_CompareIPs(&ip, &ip2, &ip2) < 0);
+      } else {
+        TEST_CHECK(UTI_CompareIPs(&ip, &ip2, &ip) == 0);
+        TEST_CHECK(UTI_CompareIPs(&ip, &ip2, &ip2) < 0);
+      }
+    }
+  }
+
+  ip_saddr.ip_addr.family = IPADDR_INET4;
+  ip_saddr.ip_addr.addr.in4 = 0x01020304;
+  ip_saddr.port = 12345;
+  s = UTI_IPSockAddrToString(&ip_saddr);
+  TEST_CHECK(strcmp(s, "1.2.3.4:12345") == 0);
+
+  s = UTI_TimeToLogForm(2000000000);
+  TEST_CHECK(strcmp(s, "2033-05-18 03:33:20") == 0);
+
+  ts.tv_sec = 3;
+  ts.tv_nsec = 500000000;
+  ts2.tv_sec = 4;
+  ts2.tv_nsec = 250000000;
+  UTI_AdjustTimespec(&ts, &ts2, &ts3, &x, 2.0, -5.0);
+  TEST_CHECK(x == 6.5);
+  TEST_CHECK(ts3.tv_sec == 10);
+  TEST_CHECK(ts3.tv_nsec == 0);
+
   for (i = -32; i <= 32; i++) {
     for (j = c = 0; j < 1000; j++) {
       UTI_GetNtp64Fuzz(&ntp_fuzz, i);
@@ -213,6 +494,18 @@ void test_unit(void) {
       TEST_CHECK(c > 400 && c < 600);
   }
 
+  TEST_CHECK(UTI_DoubleToNtp32(-1.0) == htonl(0));
+  TEST_CHECK(UTI_DoubleToNtp32(0.0) == htonl(0));
+  TEST_CHECK(UTI_DoubleToNtp32(1e-9) == htonl(1));
+  TEST_CHECK(UTI_DoubleToNtp32(32768.0) == htonl(0x80000000));
+  TEST_CHECK(UTI_DoubleToNtp32(65536.0) == htonl(0xffffffff));
+  TEST_CHECK(UTI_DoubleToNtp32(65537.0) == htonl(0xffffffff));
+
+  for (i = 0; i < 100000; i++) {
+    UTI_GetRandomBytes(&ntp32_ts, sizeof (ntp32_ts));
+    TEST_CHECK(UTI_DoubleToNtp32(UTI_Ntp32ToDouble(ntp32_ts)) == ntp32_ts);
+  }
+
   ts.tv_nsec = 0;
 
   ts.tv_sec = 10;
@@ -226,17 +519,54 @@ void test_unit(void) {
   TEST_CHECK(!UTI_IsTimeOffsetSane(&ts, 10.0));
   TEST_CHECK(UTI_IsTimeOffsetSane(&ts, -20.0));
 
+  TEST_CHECK(UTI_Log2ToDouble(-1) == 0.5);
+  TEST_CHECK(UTI_Log2ToDouble(0) == 1.0);
+  TEST_CHECK(UTI_Log2ToDouble(1) == 2.0);
+  TEST_CHECK(UTI_Log2ToDouble(-31) < UTI_Log2ToDouble(-30));
+  TEST_CHECK(UTI_Log2ToDouble(-32) == UTI_Log2ToDouble(-31));
+  TEST_CHECK(UTI_Log2ToDouble(30) < UTI_Log2ToDouble(32));
+  TEST_CHECK(UTI_Log2ToDouble(31) == UTI_Log2ToDouble(32));
+
   UTI_TimespecHostToNetwork(&ts, &tspec);
+#ifdef HAVE_LONG_TIME_T
+  TEST_CHECK(tspec.tv_sec_high == htonl(ts.tv_sec >> 32));
+#else
+  TEST_CHECK(tspec.tv_sec_high == htonl(TV_NOHIGHSEC));
+#endif
+  TEST_CHECK(tspec.tv_sec_low == htonl(ts.tv_sec));
+  TEST_CHECK(tspec.tv_nsec == htonl(ts.tv_nsec));
   UTI_TimespecNetworkToHost(&tspec, &ts2);
   TEST_CHECK(!UTI_CompareTimespecs(&ts, &ts2));
 
-  for (i = c = 0; i < 100000; i++) {
-    j = random() % (sizeof (buf) + 1);
-    UTI_GetRandomBytes(buf, j);
-    if (j && buf[j - 1] % 2)
-      c++;
-  }
-  TEST_CHECK(c > 46000 && c < 48000);
+  TEST_CHECK(UTI_CmacNameToAlgorithm("AES128") == CMC_AES128);
+  TEST_CHECK(UTI_CmacNameToAlgorithm("AES256") == CMC_AES256);
+  TEST_CHECK(UTI_CmacNameToAlgorithm("NOSUCHCMAC") == CMC_INVALID);
+
+  TEST_CHECK(UTI_HashNameToAlgorithm("MD5") == HSH_MD5);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA1") == HSH_SHA1);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA256") == HSH_SHA256);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA384") == HSH_SHA384);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA512") == HSH_SHA512);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA3-224") == HSH_SHA3_224);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA3-256") == HSH_SHA3_256);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA3-384") == HSH_SHA3_384);
+  TEST_CHECK(UTI_HashNameToAlgorithm("SHA3-512") == HSH_SHA3_512);
+  TEST_CHECK(UTI_HashNameToAlgorithm("TIGER") == HSH_TIGER);
+  TEST_CHECK(UTI_HashNameToAlgorithm("WHIRLPOOL") == HSH_WHIRLPOOL);
+  TEST_CHECK(UTI_HashNameToAlgorithm("NOSUCHHASH") == HSH_INVALID);
+
+  i = open("/dev/null", 0);
+  TEST_CHECK(UTI_FdSetCloexec(i));
+  j = fcntl(i, F_GETFD);
+  TEST_CHECK(j & F_GETFD);
+  close(i);
+
+  UTI_SetQuitSignalsHandler(handle_signal, 0);
+  TEST_CHECK(handled_signal == 0);
+  kill(getpid(), SIGPIPE);
+  while (handled_signal == 0)
+    ;
+  TEST_CHECK(handled_signal == SIGPIPE);
 
   s = UTI_PathToDir("/aaa/bbb/ccc/ddd");
   TEST_CHECK(!strcmp(s, "/aaa/bbb/ccc"));
@@ -319,6 +649,22 @@ void test_unit(void) {
   TEST_CHECK(stat("testfile", &st) < 0);
   TEST_CHECK(!UTI_RemoveFile(NULL, "testfile", NULL));
 
+  for (i = c = 0; i < 100000; i++) {
+    j = random() % (sizeof (buf) + 1);
+    UTI_GetRandomBytesUrandom(buf, j);
+    if (j && buf[j - 1] % 2)
+      c++;
+  }
+  TEST_CHECK(c > 46000 && c < 48000);
+
+  for (i = c = 0; i < 100000; i++) {
+    j = random() % (sizeof (buf) + 1);
+    UTI_GetRandomBytes(buf, j);
+    if (j && buf[j - 1] % 2)
+      c++;
+  }
+  TEST_CHECK(c > 46000 && c < 48000);
+
   assert(sizeof (buf) >= 16);
   TEST_CHECK(UTI_HexToBytes("", buf, sizeof (buf)) == 0);
   TEST_CHECK(UTI_HexToBytes("0", buf, sizeof (buf)) == 0);