diff --git a/src/libCom/cmdSubr.c b/src/libCom/cmdSubr.c
index 4dcbcfa2b..9b682b689 100644
--- a/src/libCom/cmdSubr.c
+++ b/src/libCom/cmdSubr.c
@@ -69,6 +69,8 @@
 #   include <ctype.h>
 #   include <sys/types.h>	/* for 'select' operations */
 #   include <sys/time.h>	/* for 'select' operations */
+
+#   include <sys/resource.h>
 #endif
 
 #include <genDefs.h>
@@ -146,6 +148,7 @@ CX_CMD	**ppCxCmd;	/* I pointer to pointer to command context */
     fd_set      fdSet;          /* set of fd's to watch with select */
     int         fdSetWidth;     /* width of select bit mask */
     struct timeval fdSetTimeout;/* timeout interval for select */
+    struct rlimit rlp;
 #endif
     CX_CMD	*pCxCmd=*ppCxCmd;/* pointer to command context */
     int		i;
@@ -161,7 +164,12 @@ CX_CMD	**ppCxCmd;	/* I pointer to pointer to command context */
 	}
 
 #ifndef vxWorks
+/* MDA - use getrlimit since getdtablesize() is obsolete
 	fdSetWidth = getdtablesize();
+*/
+	getrlimit(RLIMIT_NOFILE,&rlp);
+	fdSetWidth = rlp.rlim_cur;
+
 	fdSetTimeout.tv_sec = 0;
 	fdSetTimeout.tv_usec = 0;
 	FD_ZERO(&fdSet);
diff --git a/src/libCom/cvtNumbers.c b/src/libCom/cvtNumbers.c
index cfe729c73..8ca51eeb1 100644
--- a/src/libCom/cvtNumbers.c
+++ b/src/libCom/cvtNumbers.c
@@ -61,8 +61,14 @@
 
 
 #ifdef vxWorks
-#define nint(value) (value>=0 ? (int)((value)+.5) : (int)((value)-.5))
-#define exp10(value) (exp(value * log(10.)))
+# define nint(value) (value>=0 ? (int)((value)+.5) : (int)((value)-.5))
+# define exp10(value) (exp(value * log(10.)))
+#else
+/* really nint and exp10 aren't ANSI-C or POSIX */
+# ifndef sun
+#  define nint(value) (value>=0 ? (int)((value)+.5) : (int)((value)-.5))
+#  define exp10(value) (exp(value * log(10.)))
+# endif
 #endif
 
 #if 0
diff --git a/src/libCom/ezsSockSubr.c b/src/libCom/ezsSockSubr.c
index a89bb186f..9327b9583 100644
--- a/src/libCom/ezsSockSubr.c
+++ b/src/libCom/ezsSockSubr.c
@@ -519,7 +519,10 @@ int	seconds;	/* I number of seconds (added to usec) to sleep */
 int	usec;		/* I number of micro-sec (added to sec) to sleep */
 {
 #ifndef vxWorks
+    sleep((unsigned int)seconds);
+/* MDA - usleep isn't POSIX 
     usleep((unsigned)(seconds*1000000 + usec));
+*/
 #else
     int		ticks;
     static int ticksPerSec=0;