On Jan 27 21:51, Ken Brown via Cygwin-patches wrote:
> According to the Linux man page for getdtablesize(3), the latter is
> supposed to return "the maximum number of files a process can have
> open, one more than the largest possible value for a file descriptor."
> The constant OPEN_MAX_MAX is the only limit enforced by Cygwin, so we
> now return that.
>
> Previously getdtablesize returned the current size of cygheap->fdtab,
> Cygwin's internal file descriptor table. But this is a dynamically
> growing table, and its current size does not reflect an actual limit
> on the number of open files.
>
> With this change, gnulib now reports that getdtablesize and
> fcntl(F_DUPFD) work on Cygwin. Packages like GNU tar that use the
> corresponding gnulib modules will no longer use gnulib replacements on
> Cygwin.
> ---
> winsup/cygwin/syscalls.cc | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
> index 5da05b18a..1f16d54b9 100644
> --- a/winsup/cygwin/syscalls.cc
> +++ b/winsup/cygwin/syscalls.cc
> @@ -2887,7 +2887,7 @@ setdtablesize (int size)
> extern "C" int
> getdtablesize ()
> {
> - return cygheap->fdtab.size;
> + return OPEN_MAX_MAX;
> }
getdtablesize is used internally, too. After this change, the values
returned by sysconf and getrlimit should be revisited as well.
Thanks,
Corinna
