| 1 | /* Copyright (C) 2010-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <sys/resource.h> |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | /* For ports that support the 64-bit ABI we do not need to define prlimit |
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| 22 | and instead prlimit aliases to prlimit64. See the prlimit64 |
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| 23 | implementation. */ |
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| 24 | #if !__RLIM_T_MATCHES_RLIM64_T |
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| 25 | int |
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| 26 | prlimit (__pid_t pid, enum __rlimit_resource resource, |
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| 27 | const struct rlimit *new_rlimit, struct rlimit *old_rlimit) |
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| 28 | { |
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| 29 | struct rlimit64 new_rlimit64_mem; |
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| 30 | struct rlimit64 *new_rlimit64 = NULL; |
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| 31 | struct rlimit64 old_rlimit64_mem; |
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| 32 | struct rlimit64 *old_rlimit64 = (old_rlimit != NULL |
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| 33 | ? &old_rlimit64_mem : NULL); |
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| 34 | |
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| 35 | if (new_rlimit != NULL) |
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| 36 | { |
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| 37 | if (new_rlimit->rlim_cur == RLIM_INFINITY) |
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| 38 | new_rlimit64_mem.rlim_cur = RLIM64_INFINITY; |
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| 39 | else |
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| 40 | new_rlimit64_mem.rlim_cur = new_rlimit->rlim_cur; |
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| 41 | if (new_rlimit->rlim_max == RLIM_INFINITY) |
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| 42 | new_rlimit64_mem.rlim_max = RLIM64_INFINITY; |
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| 43 | else |
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| 44 | new_rlimit64_mem.rlim_max = new_rlimit->rlim_max; |
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| 45 | new_rlimit64 = &new_rlimit64_mem; |
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| 46 | } |
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| 47 | |
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| 48 | int res = INLINE_SYSCALL (prlimit64, 4, pid, resource, new_rlimit64, |
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| 49 | old_rlimit64); |
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| 50 | |
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| 51 | if (res == 0 && old_rlimit != NULL) |
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| 52 | { |
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| 53 | /* The prlimit64 syscall is ill-designed for 32-bit machines. |
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| 54 | We have to provide a 32-bit variant since otherwise the LFS |
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| 55 | system would not work. The infinity value can be translated, |
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| 56 | but otherwise what shall we do if the syscall succeeds but the |
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| 57 | old values do not fit into a rlimit structure? We cannot return |
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| 58 | an error because the operation itself worked. Best is perhaps |
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| 59 | to return RLIM_INFINITY. */ |
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| 60 | old_rlimit->rlim_cur = old_rlimit64_mem.rlim_cur; |
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| 61 | if (old_rlimit->rlim_cur != old_rlimit64_mem.rlim_cur) |
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| 62 | { |
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| 63 | if ((new_rlimit == NULL) |
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| 64 | && (old_rlimit64_mem.rlim_cur != RLIM64_INFINITY)) |
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| 65 | return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW); |
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| 66 | old_rlimit->rlim_cur = RLIM_INFINITY; |
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| 67 | } |
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| 68 | old_rlimit->rlim_max = old_rlimit64_mem.rlim_max; |
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| 69 | if (old_rlimit->rlim_max != old_rlimit64_mem.rlim_max) |
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| 70 | { |
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| 71 | if ((new_rlimit == NULL) |
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| 72 | && (old_rlimit64_mem.rlim_max != RLIM64_INFINITY)) |
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| 73 | return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW); |
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| 74 | old_rlimit->rlim_max = RLIM_INFINITY; |
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| 75 | } |
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| 76 | } |
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| 77 | |
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| 78 | return res; |
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| 79 | } |
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| 80 | #endif /* __RLIM_T_MATCHES_RLIM64_T */ |
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| 81 | |
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