| 1 | //===---------- Linux implementation of the POSIX mremap function----------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/sys/mman/mremap.h" |
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| 10 | |
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| 11 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
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| 12 | #include "src/__support/common.h" |
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| 13 | |
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| 14 | #include "src/__support/libc_errno.h" |
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| 15 | #include "src/__support/macros/config.h" |
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| 16 | #include <linux/param.h> // For EXEC_PAGESIZE. |
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| 17 | #include <stdarg.h> |
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| 18 | #include <sys/syscall.h> // For syscall numbers. |
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| 19 | |
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| 20 | namespace LIBC_NAMESPACE_DECL { |
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| 21 | |
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| 22 | LLVM_LIBC_FUNCTION(void *, mremap, |
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| 23 | (void *old_address, size_t old_size, size_t new_size, |
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| 24 | int flags, ... /* void *new_address */)) { |
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| 25 | |
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| 26 | long ret = 0; |
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| 27 | void *new_address = nullptr; |
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| 28 | if (flags & MREMAP_FIXED) { |
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| 29 | va_list varargs; |
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| 30 | va_start(varargs, flags); |
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| 31 | new_address = va_arg(varargs, void *); |
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| 32 | va_end(varargs); |
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| 33 | } |
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| 34 | ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_mremap, old_address, old_size, |
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| 35 | new_size, flags, new_address); |
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| 36 | |
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| 37 | if (ret < 0 && ret > -EXEC_PAGESIZE) { |
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| 38 | libc_errno = static_cast<int>(-ret); |
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| 39 | return MAP_FAILED; |
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| 40 | } |
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| 41 | |
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| 42 | return reinterpret_cast<void *>(ret); |
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| 43 | } |
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| 44 | |
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| 45 | } // namespace LIBC_NAMESPACE_DECL |
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| 46 | |
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