5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/fscanf.html}
7 LSB specification:@* @url{https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-fscanf.html}
9 Gnulib module: stdio, nonblocking
11 Portability problems fixed by Gnulib module @code{stdio}, together with module @code{nonblocking}:
14 When reading from a non-blocking pipe whose buffer is empty, this function
15 fails with @code{errno} being set to @code{EINVAL} instead of @code{EAGAIN} on
20 Portability problems not fixed by Gnulib:
23 C99 and POSIX.1-2001 and later require end-of-file to be sticky, that
24 is, they require this function to act as if it reads end-of-file if
25 @code{feof} would return nonzero. However, on some systems this
26 function attempts to read from the underlying file descriptor even if
27 the stream's end-of-file indicator is set. These systems include
28 glibc and default Solaris.
30 On Windows platforms (excluding Cygwin), this function does not set @code{errno}
33 On Windows, this function doesn't support the @code{hh}, @code{ll}, @code{j},
34 @code{t}, @code{z} size specifiers.