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/* Get/set resource limits. Linux specific syscall.
Copyright (C) 2021-2022 Free Software Foundation, Inc.
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
<https://www.gnu.org/licenses/>. */
#include <sys/resource.h>
#include <sysdep.h>
#include <stddef.h> // needed for NULL to be defined
#if defined(__NR_prlimit64) && __WORDSIZE == 32 && !defined(__USE_FILE_OFFSET64)
int
prlimit (__pid_t pid, enum __rlimit_resource resource,
const struct rlimit *new_rlimit, struct rlimit *old_rlimit)
{
struct rlimit64 new_rlimit64;
struct rlimit64 *new_rlimit64_ptr = NULL;
struct rlimit64 old_rlimit64;
struct rlimit64 *old_rlimit64_ptr = (old_rlimit != NULL ? &old_rlimit64 : NULL);
int res;
if (new_rlimit != NULL) {
if (new_rlimit->rlim_cur == RLIM_INFINITY)
new_rlimit64.rlim_cur = RLIM64_INFINITY;
else
new_rlimit64.rlim_cur = new_rlimit->rlim_cur;
if (new_rlimit->rlim_max == RLIM_INFINITY)
new_rlimit64.rlim_max = RLIM64_INFINITY;
else
new_rlimit64.rlim_max = new_rlimit->rlim_max;
new_rlimit64_ptr = &new_rlimit64;
}
res = INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit64_ptr,
old_rlimit64_ptr);
if (res == 0 && old_rlimit != NULL) {
/* If the syscall succeeds but the values do not fit into a
rlimit structure set EOVERFLOW errno and retrun -1.
With current Linux implementation of the prlimit64 syscall,
overflow can't happen. An extra condition has been added to get
the same behavior as in glibc for future potential overflows. */
old_rlimit->rlim_cur = old_rlimit64.rlim_cur;
if (old_rlimit64.rlim_cur != old_rlimit->rlim_cur) {
if (new_rlimit == NULL &&
old_rlimit64.rlim_cur != RLIM64_INFINITY) {
__set_errno(EOVERFLOW);
return -1;
}
old_rlimit->rlim_cur = RLIM_INFINITY;
}
old_rlimit->rlim_max = old_rlimit64.rlim_max;
if (old_rlimit64.rlim_max != old_rlimit->rlim_max) {
if (new_rlimit == NULL &&
old_rlimit64.rlim_max != RLIM64_INFINITY) {
__set_errno(EOVERFLOW);
return -1;
}
old_rlimit->rlim_max = RLIM_INFINITY;
}
}
return res;
}
#endif
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