| 1 | //===-- Implementation of sched_getaffinity -------------------------------===// |
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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/sched/sched_getaffinity.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 | #include "src/__support/libc_errno.h" |
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| 14 | #include "src/__support/macros/config.h" |
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| 15 | |
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| 16 | #include <sched.h> |
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| 17 | #include <stdint.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(int, sched_getaffinity, |
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| 23 | (pid_t tid, size_t cpuset_size, cpu_set_t *mask)) { |
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| 24 | int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_sched_getaffinity, tid, |
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| 25 | cpuset_size, mask); |
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| 26 | if (ret < 0) { |
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| 27 | libc_errno = -ret; |
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| 28 | return -1; |
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| 29 | } |
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| 30 | if (size_t(ret) < cpuset_size) { |
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| 31 | // This means that only |ret| bytes in |mask| have been set. We will have to |
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| 32 | // zero out the remaining bytes. |
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| 33 | auto *mask_bytes = reinterpret_cast<uint8_t *>(mask); |
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| 34 | for (size_t i = size_t(ret); i < cpuset_size; ++i) |
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| 35 | mask_bytes[i] = 0; |
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| 36 | } |
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| 37 | return 0; |
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| 38 | } |
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| 39 | |
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| 40 | } // namespace LIBC_NAMESPACE_DECL |
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| 41 | |
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