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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; } extern "C" int -- 2.30.0