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78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/* Copyright (C) 2010-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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int
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prlimit (__pid_t pid, enum __rlimit_resource resource,
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const struct rlimit *new_rlimit, struct rlimit *old_rlimit)
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{
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struct rlimit64 new_rlimit64_mem;
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struct rlimit64 *new_rlimit64 = NULL;
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struct rlimit64 old_rlimit64_mem;
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struct rlimit64 *old_rlimit64 = (old_rlimit != NULL
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? &old_rlimit64_mem : NULL);
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if (new_rlimit != NULL)
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{
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if (new_rlimit->rlim_cur == RLIM_INFINITY)
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new_rlimit64_mem.rlim_cur = RLIM64_INFINITY;
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else
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new_rlimit64_mem.rlim_cur = new_rlimit->rlim_cur;
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if (new_rlimit->rlim_max == RLIM_INFINITY)
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new_rlimit64_mem.rlim_max = RLIM64_INFINITY;
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else
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new_rlimit64_mem.rlim_max = new_rlimit->rlim_max;
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new_rlimit64 = &new_rlimit64_mem;
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}
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int res = INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit64,
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old_rlimit64);
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if (res == 0 && old_rlimit != NULL)
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{
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/* The prlimit64 syscall is ill-designed for 32-bit machines.
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We have to provide a 32-bit variant since otherwise the LFS
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system would not work. The infinity value can be translated,
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but otherwise what shall we do if the syscall succeeds but the
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old values do not fit into a rlimit structure? We cannot return
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an error because the operation itself worked. Best is perhaps
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to return RLIM_INFINITY. */
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old_rlimit->rlim_cur = old_rlimit64_mem.rlim_cur;
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if (old_rlimit->rlim_cur != old_rlimit64_mem.rlim_cur)
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{
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if ((new_rlimit == NULL)
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&& (old_rlimit64_mem.rlim_cur != RLIM64_INFINITY))
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
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old_rlimit->rlim_cur = RLIM_INFINITY;
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}
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old_rlimit->rlim_max = old_rlimit64_mem.rlim_max;
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if (old_rlimit->rlim_max != old_rlimit64_mem.rlim_max)
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{
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if ((new_rlimit == NULL)
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&& (old_rlimit64_mem.rlim_max != RLIM64_INFINITY))
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
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old_rlimit->rlim_max = RLIM_INFINITY;
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}
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}
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return res;
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}
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