| 1 | //===---------- Linux implementation of the prctl 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/prctl/prctl.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 | |
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| 13 | #include "src/__support/libc_errno.h" |
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| 14 | #include "src/__support/macros/config.h" |
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| 15 | #include <sys/syscall.h> // For syscall numbers. |
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| 16 | |
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| 17 | namespace LIBC_NAMESPACE_DECL { |
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| 18 | |
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| 19 | LLVM_LIBC_FUNCTION(int, prctl, |
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| 20 | (int option, unsigned long arg2, unsigned long arg3, |
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| 21 | unsigned long arg4, unsigned long arg5)) { |
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| 22 | long ret = |
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| 23 | LIBC_NAMESPACE::syscall_impl(SYS_prctl, option, arg2, arg3, arg4, arg5); |
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| 24 | // The manpage states that "... return the nonnegative values described |
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| 25 | // above. All other option values return 0 on success. On error, |
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| 26 | // -1 is returned, and errno is set to indicate the error." |
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| 27 | // According to the kernel implementation |
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| 28 | // (https://github.com/torvalds/linux/blob/bee0e7762ad2c6025b9f5245c040fcc36ef2bde8/kernel/sys.c#L2442), |
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| 29 | // return value from the syscall is set to 0 on default so we do not need to |
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| 30 | // set the value on success manually. |
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| 31 | if (ret < 0) { |
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| 32 | libc_errno = static_cast<int>(-ret); |
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| 33 | return -1; |
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| 34 | } |
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| 35 | return static_cast<int>(ret); |
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| 36 | } |
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| 37 | |
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| 38 | } // namespace LIBC_NAMESPACE_DECL |
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| 39 | |
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