sysdeps/unix/sysv/linux/getrlimit64.c

   1 /* Linux getrlimit64 implementation (64 bits rlim_t).
   2    Copyright (C) 2010-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <shlib-compat.h>
  22
  23 /* Add this redirection so the strong_alias for __RLIM_T_MATCHES_RLIM64_T
  24    linking getlimit64 to {__}getrlimit does not throw a type error.  */
  25 #undef getrlimit
  26 #undef __getrlimit
  27 #define getrlimit getrlimit_redirect
  28 #define __getrlimit __getrlimit_redirect
  29 #include <sys/resource.h>
  30 #undef getrlimit
  31 #undef __getrlimit
  32
  33 /* Put the soft and hard limits for RESOURCE in *RLIMITS.
  34    Returns 0 if successful, -1 if not (and sets errno).  */
  35 int
  36 __getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
  37 {
  38   return INLINE_SYSCALL_CALL (prlimit64, 0, resource, NULL, rlimits);
  39 }
  40 libc_hidden_def (__getrlimit64)
  41
  42 #if __RLIM_T_MATCHES_RLIM64_T
  43 /* If both rlim_t and rlimt64_t are essentially the same type we can use
  44    alias both interfaces.  */
  45 strong_alias (__getrlimit64, __GI_getrlimit)
  46 strong_alias (__getrlimit64, __GI___getrlimit)
  47 strong_alias (__getrlimit64, __getrlimit)
  48 weak_alias (__getrlimit64, getrlimit)
  49 /* And there is no need for compat symbols.  */
  50 # undef SHLIB_COMPAT
  51 # define SHLIB_COMPAT(a, b, c) 0
  52 #endif
  53
  54 #if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_2)
  55 /* Back compatible 2GiB limited rlimit.  */
  56 extern int __new_getrlimit (enum __rlimit_resource, struct rlimit *);
  57
  58 int
  59 attribute_compat_text_section
  60 __old_getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
  61 {
  62 # if __RLIM_T_MATCHES_RLIM64_T
  63 #  define rlimits32 (*rlimits)
  64 # else
  65   struct rlimit rlimits32;
  66 # endif
  67
  68   if (__new_getrlimit (resource, &rlimits32) < 0)
  69     return -1;
  70
  71   if (rlimits32.rlim_cur == RLIM_INFINITY)
  72     rlimits->rlim_cur = RLIM64_INFINITY >> 1;
  73   else
  74     rlimits->rlim_cur = rlimits32.rlim_cur;
  75   if (rlimits32.rlim_max == RLIM_INFINITY)
  76     rlimits->rlim_max = RLIM64_INFINITY >> 1;
  77   else
  78     rlimits->rlim_max = rlimits32.rlim_max;
  79
  80   return 0;
  81 }
  82 versioned_symbol (libc, __getrlimit64, getrlimit64, GLIBC_2_2);
  83 compat_symbol (libc, __old_getrlimit64, getrlimit64, GLIBC_2_1);
  84 #else
  85 weak_alias (__getrlimit64, getrlimit64)
  86 libc_hidden_weak (getrlimit64)
  87 #endif