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libiconv 1.16

    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