diff --git a/rosapps/applications/cmdutils/touch/touch.c b/rosapps/applications/cmdutils/touch/touch.c
index 80a99c4a29c..257eaeac176 100644
--- a/rosapps/applications/cmdutils/touch/touch.c
+++ b/rosapps/applications/cmdutils/touch/touch.c
@@ -146,9 +146,9 @@ main(int argc, char *argv[])
 		if (stat(*argv, &sb)) {
 			if (!cflag) {
 				/* Create the file. */
-				fd = open(*argv,
+				fd = _open(*argv,
 				    O_WRONLY | O_CREAT, DEFFILEMODE);
-				if (fd == -1 || fstat(fd, &sb) || close(fd)) {
+				if (fd == -1 || fstat(fd, &sb) || _close(fd)) {
 					rval = 1;
 					warn("%s", *argv);
 					continue;
@@ -300,37 +300,37 @@ rw(char *fname, struct stat *sbp, int force)
 	}
 
 	needed_chmod = rval = 0;
-	if ((fd = open(fname, O_RDWR, 0)) == -1) {
-		if (!force || chmod(fname, DEFFILEMODE))
+	if ((fd = _open(fname, O_RDWR, 0)) == -1) {
+		if (!force || _chmod(fname, DEFFILEMODE))
 			goto err;
-		if ((fd = open(fname, O_RDWR, 0)) == -1)
+		if ((fd = _open(fname, O_RDWR, 0)) == -1)
 			goto err;
 		needed_chmod = 1;
 	}
 
 	if (sbp->st_size != 0) {
-		if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
+		if (_read(fd, &byte, sizeof(byte)) != sizeof(byte))
 			goto err;
-		if (lseek(fd, (off_t)0, SEEK_SET) == -1)
+		if (_lseek(fd, (off_t)0, SEEK_SET) == -1)
 			goto err;
-		if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
+		if (_write(fd, &byte, sizeof(byte)) != sizeof(byte))
 			goto err;
 	} else {
-		if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
+		if (_write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
 err:			rval = 1;
 			warn("%s", fname);
 /*		} else if (ftruncate(fd, (off_t)0)) {*/
-		} else if (chsize(fd, (off_t)0)) {
+		} else if (_chsize(fd, (off_t)0)) {
 			rval = 1;
 			warn("%s: file modified", fname);
 		}
 	}
 
-	if (close(fd) && rval != 1) {
+	if (_close(fd) && rval != 1) {
 		rval = 1;
 		warn("%s", fname);
 	}
-	if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
+	if (needed_chmod && _chmod(fname, sbp->st_mode) && rval != 1) {
 		rval = 1;
 		warn("%s: permissions modified", fname);
 	}
diff --git a/rosapps/applications/net/ncftp/libncftp/open.c b/rosapps/applications/net/ncftp/libncftp/open.c
index 7c247633fdb..f3854edd5fc 100644
--- a/rosapps/applications/net/ncftp/libncftp/open.c
+++ b/rosapps/applications/net/ncftp/libncftp/open.c
@@ -1075,14 +1075,14 @@ FTPRebuildConnectionInfo(const FTPLIPtr lip, const FTPCIPtr cip)
 	/* Reattach the FILE pointers for use with the Std I/O library
 	 * routines.
 	 */
-	if ((cip->cin = fdopen(cip->ctrlSocketR, "r")) == NULL) {
+	if ((cip->cin = _fdopen(cip->ctrlSocketR, "r")) == NULL) {
 		cip->errNo = kErrFdopenR;
 		cip->ctrlSocketR = kClosedFileDescriptor;
 		cip->ctrlSocketW = kClosedFileDescriptor;
 		return (kErrFdopenR);
 	}
 
-	if ((cip->cout = fdopen(cip->ctrlSocketW, "w")) == NULL) {
+	if ((cip->cout = _fdopen(cip->ctrlSocketW, "w")) == NULL) {
 		CloseFile(&cip->cin);
 		cip->errNo = kErrFdopenW;
 		cip->ctrlSocketR = kClosedFileDescriptor;
diff --git a/rosapps/applications/net/ncftp/ncftp/bookmark.c b/rosapps/applications/net/ncftp/ncftp/bookmark.c
index d616db0a771..e42eaee52e2 100644
--- a/rosapps/applications/net/ncftp/ncftp/bookmark.c
+++ b/rosapps/applications/net/ncftp/ncftp/bookmark.c
@@ -297,7 +297,7 @@ OpenBookmarkFile(int *numBookmarks0)
 		return NULL;		/* Okay to not have one yet. */
 	}
 
-	(void) chmod(pathName, 00600);
+	(void) _chmod(pathName, 00600);
 	if (FGets(line, sizeof(line), fp) == NULL) {
 		(void) fprintf(stderr, "%s: invalid format.\n", pathName);
 		(void) fclose(fp);
@@ -683,7 +683,7 @@ OpenTmpBookmarkFile(int nb)
 		perror(pathName);
 		return (NULL);
 	}
-	(void) chmod(pathName, 00600);
+	(void) _chmod(pathName, 00600);
 	if (nb > 0) {
 		if (fprintf(outfp, "NcFTP bookmark-file version: %d\nNumber of bookmarks: %d\n", kBookmarkVersion, nb) < 0) {
 			(void) fprintf(stderr, "Could not save bookmark.\n");
diff --git a/rosapps/applications/net/ncftp/ncftp/cmds.c b/rosapps/applications/net/ncftp/ncftp/cmds.c
index 574c84bedcc..b8b8d300933 100644
--- a/rosapps/applications/net/ncftp/ncftp/cmds.c
+++ b/rosapps/applications/net/ncftp/ncftp/cmds.c
@@ -2540,7 +2540,7 @@ PageCmd(const int argc, const char **const argv, const CommandPtr cmdp, const Ar
 #endif
 
 	for (i=1; i<argc; i++) {
-		result = FTPGetOneFile2(&gConn, argv[i], NULL, kTypeAscii, fileno(stream), kResumeNo, kAppendNo);
+		result = FTPGetOneFile2(&gConn, argv[i], NULL, kTypeAscii, _fileno(stream), kResumeNo, kAppendNo);
 		if (result < 0) {
 			if (errno != EPIPE) {
 				ClosePager(stream);
diff --git a/rosapps/applications/net/ncftp/ncftp/getline.c b/rosapps/applications/net/ncftp/ncftp/getline.c
index 51a889fdaac..c26299dd4fb 100644
--- a/rosapps/applications/net/ncftp/ncftp/getline.c
+++ b/rosapps/applications/net/ncftp/ncftp/getline.c
@@ -506,7 +506,7 @@ gl_init(void)
 	}
         hist_init();
     }
-    if (isatty(0) == 0 || isatty(1) == 0)
+    if (_isatty(0) == 0 || _isatty(1) == 0)
 	gl_error("\n*** Error: getline(): not interactive, use stdio.\n");
     gl_char_init();
     gl_init_done = 1;
@@ -2398,7 +2398,7 @@ gl_local_filename_completion_proc(const char *start, int idx)
 		if ((name[0] == '.') && ((name[1] == '\0') || ((name[1] == '.') && (name[2] == '\0'))))
 			goto next;	/* Skip . and .. */
 
-		if ((filepfxlen == 0) || (strnicmp(name, filepfx, filepfxlen) == 0)) {
+		if ((filepfxlen == 0) || (_strnicmp(name, filepfx, filepfxlen) == 0)) {
 			/* match */
 			len = strlen(name);
 			cp = (char *) malloc(filepfxoffset + len + 4 /* spare */ + 1 /* NUL */);
diff --git a/rosapps/applications/net/ncftp/ncftp/preffw.c b/rosapps/applications/net/ncftp/ncftp/preffw.c
index 490b6b9f666..c47cfefcd9b 100644
--- a/rosapps/applications/net/ncftp/ncftp/preffw.c
+++ b/rosapps/applications/net/ncftp/ncftp/preffw.c
@@ -321,7 +321,7 @@ LoadFirewallPrefs(int forceReload)
 		if (fp != NULL) {
 			WriteDefaultFirewallPrefs(fp);
 			(void) fclose(fp);
-			(void) chmod(pathName, 00600);
+			(void) _chmod(pathName, 00600);
 			gNumProgramRuns = 1;
 		}
 	}
diff --git a/rosapps/applications/net/ncftp/ncftp/readln.c b/rosapps/applications/net/ncftp/ncftp/readln.c
index 836d52bbe15..2d3473b2689 100644
--- a/rosapps/applications/net/ncftp/ncftp/readln.c
+++ b/rosapps/applications/net/ncftp/ncftp/readln.c
@@ -649,7 +649,7 @@ SaveHistory(void)
 
 	gl_strlen = Vt100VisibleStrlen;
 	gl_histsavefile(pathName);
-	(void) chmod(pathName, 00600);
+	(void) _chmod(pathName, 00600);
 }	/* SaveHistory */
 
 
diff --git a/rosapps/applications/net/ncftp/ncftp/spool.c b/rosapps/applications/net/ncftp/ncftp/spool.c
index 42189ad684d..24962f1f95e 100644
--- a/rosapps/applications/net/ncftp/ncftp/spool.c
+++ b/rosapps/applications/net/ncftp/ncftp/spool.c
@@ -113,7 +113,7 @@ HaveSpool(void)
 		gHaveSpool = 0;
 		if (gOurInstallationPath[0] != '\0') {
 			OurInstallationPath(ncftpbatch, sizeof(ncftpbatch), "ncftpbatch.exe");
-			gHaveSpool = (access(ncftpbatch, F_OK) == 0) ? 1 : 0;
+			gHaveSpool = (_access(ncftpbatch, F_OK) == 0) ? 1 : 0;
 		}
 	}
 #elif defined(BINDIR)
diff --git a/rosapps/applications/net/ncftp/ncftp/trace.c b/rosapps/applications/net/ncftp/ncftp/trace.c
index 409fff8df58..f344316a4cc 100644
--- a/rosapps/applications/net/ncftp/ncftp/trace.c
+++ b/rosapps/applications/net/ncftp/ncftp/trace.c
@@ -125,7 +125,7 @@ OpenTrace(void)
 
 	fp = fopen(pathName, FOPEN_WRITE_TEXT);
 	if (fp != NULL) {
-		(void) chmod(pathName, 00600);
+		(void) _chmod(pathName, 00600);
 #ifdef HAVE_SETVBUF
 		(void) setvbuf(fp, gTraceLBuf, _IOLBF, sizeof(gTraceLBuf));
 #endif	/* HAVE_SETVBUF */
diff --git a/rosapps/applications/sysutils/utils/binpatch/patch.c b/rosapps/applications/sysutils/utils/binpatch/patch.c
index f30ece3aad8..e2a13c3a625 100644
--- a/rosapps/applications/sysutils/utils/binpatch/patch.c
+++ b/rosapps/applications/sysutils/utils/binpatch/patch.c
@@ -69,7 +69,7 @@ loadFile(const char *fileName, int *fileSize_)
    }
 
    /* Get file size */
-   if (fstat(fileno(f), &sb) < 0)
+   if (fstat(_fileno(f), &sb) < 0)
    {
       fclose(f);
       printf("Couldn't get size of file %s!\n", fileName);
@@ -506,7 +506,7 @@ applyPatch_file_open_error:
             _snprintf(buffer, MAX_PATH, "%s.bak", fileName);
             buffer[MAX_PATH-1] = '\0';
             makeBackup = 1;
-            if (access(buffer, 0) >= 0) /* file exists */
+            if (_access(buffer, 0) >= 0) /* file exists */
             {
                printf("File %s already exists, overwrite? (Y)es, (N)o, (A)bort", buffer);
                do