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glibc/sysdeps/unix/sysv/linux/prlimit.c
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/* Copyright (C) 2010-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <sys/resource.h> | |
#include <sys/syscall.h> | |
#ifdef __NR_prlimit64 | |
int | |
prlimit (__pid_t pid, enum __rlimit_resource resource, | |
const struct rlimit *new_rlimit, struct rlimit *old_rlimit) | |
{ | |
struct rlimit64 new_rlimit64_mem; | |
struct rlimit64 *new_rlimit64 = NULL; | |
struct rlimit64 old_rlimit64_mem; | |
struct rlimit64 *old_rlimit64 = (old_rlimit != NULL | |
? &old_rlimit64_mem : NULL); | |
if (new_rlimit != NULL) | |
{ | |
if (new_rlimit->rlim_cur == RLIM_INFINITY) | |
new_rlimit64_mem.rlim_cur = RLIM64_INFINITY; | |
else | |
new_rlimit64_mem.rlim_cur = new_rlimit->rlim_cur; | |
if (new_rlimit->rlim_max == RLIM_INFINITY) | |
new_rlimit64_mem.rlim_max = RLIM64_INFINITY; | |
else | |
new_rlimit64_mem.rlim_max = new_rlimit->rlim_max; | |
new_rlimit64 = &new_rlimit64_mem; | |
} | |
int res = INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit64, | |
old_rlimit64); | |
if (res == 0 && old_rlimit != NULL) | |
{ | |
/* The prlimit64 syscall is ill-designed for 32-bit machines. | |
We have to provide a 32-bit variant since otherwise the LFS | |
system would not work. But what shall we do if the syscall | |
succeeds but the old values do not fit into a rlimit | |
structure? We cannot return an error because the operation | |
itself worked. Best is perhaps to return RLIM_INFINITY. */ | |
old_rlimit->rlim_cur = old_rlimit64_mem.rlim_cur; | |
if (old_rlimit->rlim_cur != old_rlimit64_mem.rlim_cur) | |
{ | |
if (new_rlimit == NULL) | |
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW); | |
old_rlimit->rlim_cur = RLIM_INFINITY; | |
} | |
old_rlimit->rlim_max = old_rlimit64_mem.rlim_max; | |
if (old_rlimit->rlim_max != old_rlimit64_mem.rlim_max) | |
{ | |
if (new_rlimit == NULL) | |
return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW); | |
old_rlimit->rlim_max = RLIM_INFINITY; | |
} | |
} | |
return res; | |
} | |
#else | |
int | |
prlimit (__pid_t pid, enum __rlimit_resource resource, | |
const struct rlimit *new_rlimit, struct rlimit *old_rlimit) | |
{ | |
return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOSYS); | |
} | |
stub_warning (prlimit) | |
#endif |