Cygwin: getdtablesize: always return OPEN_MAX_MAX

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.
This commit is contained in:
Ken Brown 2021-01-27 20:06:22 -05:00
parent 6c1552b0da
commit 3d256e22e2
1 changed files with 1 additions and 1 deletions

View File

@ -2887,7 +2887,7 @@ setdtablesize (int size)
extern "C" int
getdtablesize ()
{
return cygheap->fdtab.size;
return OPEN_MAX_MAX;
}
extern "C" int