@deftypevr Macro int ETXTBSY
@standards{BSD, errno.h}
@errno{ETXTBSY, 26, Text file busy}
An attempt to execute a file that is currently open for writing, or
write to a file that is currently being executed. Often using a
debugger to run a program is considered having it open for writing and
will cause this error. (The name stands for ``text file busy''.) This
is not an error on @gnuhurdsystems{}; the text is copied as necessary.
@end deftypevr