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Annotation of embedaddon/libiconv/srclib/sys-limits.h, revision 1.1.1.1

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