/* System call limits

   Copyright 2018 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#ifndef _SYS_LIMITS_H

#define _SYS_LIMITS_H

#include <limits.h>

/* Maximum number of bytes to read or write in a single system call.

   This can be useful for system calls like sendfile on GNU/Linux,

   which do not handle more than MAX_RW_COUNT bytes correctly.

   The Linux kernel MAX_RW_COUNT is at least INT_MAX >> 20 << 20,

   where the 20 comes from the Hexagon port with 1 MiB pages; use that

   as an approximation, as the exact value may not be available to us.

   Using this also works around a serious Linux bug before 2.6.16; see

   <https://bugzilla.redhat.com/show_bug.cgi?id=612839>.

   Using this also works around a Tru64 5.1 bug, where attempting

   to read INT_MAX bytes fails with errno == EINVAL.  See

   <https://lists.gnu.org/r/bug-gnu-utils/2002-04/msg00010.html>.

   Using this is likely to work around similar bugs in other operating

   systems.  */

enum { SYS_BUFSIZE_MAX = INT_MAX >> 20 << 20 };

#endif