| 1 | /* Wrapper for the mlock2 system call with fallback to mlock. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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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/mman.h> |
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| 19 | #include <errno.h> |
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| 20 | #include <sysdep.h> |
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| 21 | |
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| 22 | int |
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| 23 | mlock2 (const void *addr, size_t length, unsigned int flags) |
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| 24 | { |
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| 25 | #ifdef __ASSUME_MLOCK2 |
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| 26 | return INLINE_SYSCALL_CALL (mlock2, addr, length, flags); |
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| 27 | #else |
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| 28 | if (flags == 0) |
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| 29 | return INLINE_SYSCALL_CALL (mlock, addr, length); |
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| 30 | int ret = INLINE_SYSCALL_CALL (mlock2, addr, length, flags); |
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| 31 | if (ret == 0 || errno != ENOSYS) |
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| 32 | return ret; |
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| 33 | /* Treat the missing system call as an invalid (non-zero) flag |
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| 34 | argument. */ |
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| 35 | __set_errno (EINVAL); |
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| 36 | return -1; |
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| 37 | #endif /* __ASSUME_MLOCK2 */ |
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| 38 | } |
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| 39 | |
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