lock() for Unix now sets the appropriate lock type (shareable or exclusive)...

lock() for Unix now sets the appropriate lock type (shareable or exclusive) based on how the file was initially opened.

src/sbbs3/smbwrap.c

@@ -179,9 +179,16 @@ long SMBCALL filelength(int fd)
 /* Sets a lock on a portion of a file */
 int SMBCALL lock(int fd, long pos, int len)
 {
+	int	flags;
  	struct flock alock;
 
-	alock.l_type = F_WRLCK;   // set a write lock to prevent all access
+	if((flags=fcntl(fd,F_GETFL))<0)
+		return -1;
+
+	if(flags==O_RDONLY)
+		alock.l_type = F_RDLCK; // set read lock to prevent writes
+	else
+		alock.l_type = F_WRLCK; // set write lock to prevent all access
 	alock.l_whence = L_SET;	  // SEEK_SET
 	alock.l_start = pos;
 	alock.l_len = len;