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@node posix_fallocate
@section @code{posix_fallocate}
@findex posix_fallocate
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html}
Gnulib module: ---
Portability problems fixed by Gnulib:
@itemize
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
macOS 11.1, FreeBSD 6.0, NetBSD 5.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14, Android 4.4.
@item
POSIX specifies that EINVAL should be returned when the file system doesn't
support the allocation operation directly. glibc however emulates the file system
allocation with writes where unsupported, and apps have depended on
that long term implementation. This is both inefficient, and as of
glibc 2.21 at least, buggy on certain NFS setups.
@item
On platforms where @code{off_t} is a 32-bit type, this function may not
work correctly across the entire data range of files larger than 2 GB.
The fix is to use the @code{AC_SYS_LARGEFILE} macro.
@end itemize
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