kc3-lang/gnulib/lib/sys-limits.h

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• Hash : a4fd2b6f
  Author :
  Date : 2018-05-05T10:27:38
  

  sys-limits.h: new file for crypto and safe I/O
  
  * lib/af_alg.c: Include sys-limits.h.
  (MAX_RW_COUNT): Remove.  Use replaced by SYS_BUFSIZE_MAX.
  (afalg_stream): Also reject negative sizes for sendfile; they
  should not happen and the code is a bit cleaner and faster this way.
  * lib/safe-read.c: Include sys-limits.h.
  (BUGGY_READ_MAXIMUM): Remove.  All uses replaced by SYS_BUFSIZE_MAX.
  * lib/sys-limits.h: New file, with values and commentary derived
  from the old safe-read.c and from GNU Emacs sysdep.c.
  * modules/crypto/md5, modules/crypto/sha1, modules/crypto/sha256:
  * modules/crypto/sha512, modules/safe-read, modules/safe-write:
  Add lib/sys-limits.h to Files section.
  

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• lib/sys-limits.h

• /* 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 2, 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
  

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