Return to sys-limits.h CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libiconv / srclib

Annotation of embedaddon/libiconv/srclib/sys-limits.h, revision 1.1

1.1     ! misho       1: /* System call limits
        !             2: 
        !             3:    Copyright 2018-2019 Free Software Foundation, Inc.
        !             4: 
        !             5:    This program is free software; you can redistribute it and/or modify
        !             6:    it under the terms of the GNU General Public License as published by
        !             7:    the Free Software Foundation; either version 3, or (at your option)
        !             8:    any later version.
        !             9: 
        !            10:    This program is distributed in the hope that it will be useful,
        !            11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            13:    GNU General Public License for more details.
        !            14: 
        !            15:    You should have received a copy of the GNU General Public License
        !            16:    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
        !            17: 
        !            18: #ifndef _GL_SYS_LIMITS_H
        !            19: #define _GL_SYS_LIMITS_H
        !            20: 
        !            21: #include <limits.h>
        !            22: 
        !            23: /* Maximum number of bytes to read or write in a single system call.
        !            24:    This can be useful for system calls like sendfile on GNU/Linux,
        !            25:    which do not handle more than MAX_RW_COUNT bytes correctly.
        !            26:    The Linux kernel MAX_RW_COUNT is at least INT_MAX >> 20 << 20,
        !            27:    where the 20 comes from the Hexagon port with 1 MiB pages; use that
        !            28:    as an approximation, as the exact value may not be available to us.
        !            29: 
        !            30:    Using this also works around a serious Linux bug before 2.6.16; see
        !            31:    <https://bugzilla.redhat.com/show_bug.cgi?id=612839>.
        !            32: 
        !            33:    Using this also works around a Tru64 5.1 bug, where attempting
        !            34:    to read INT_MAX bytes fails with errno == EINVAL.  See
        !            35:    <https://lists.gnu.org/r/bug-gnu-utils/2002-04/msg00010.html>.
        !            36: 
        !            37:    Using this is likely to work around similar bugs in other operating
        !            38:    systems.  */
        !            39: 
        !            40: enum { SYS_BUFSIZE_MAX = INT_MAX >> 20 << 20 };
        !            41: 
        !            42: #endif