| 1 | //===-- Linux implementation of nanosleep 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/time/nanosleep.h" |
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| 10 | #include "hdr/time_macros.h" |
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| 11 | #include "src/__support/OSUtil/syscall.h" // For syscall functions. |
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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 <stdint.h> // For int64_t. |
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| 17 | #include <sys/syscall.h> // For syscall numbers. |
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| 18 | |
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| 19 | namespace LIBC_NAMESPACE_DECL { |
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| 20 | |
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| 21 | LLVM_LIBC_FUNCTION(int, nanosleep, |
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| 22 | (const struct timespec *req, struct timespec *rem)) { |
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| 23 | #if SYS_nanosleep |
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| 24 | int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_nanosleep, req, rem); |
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| 25 | #elif defined(SYS_clock_nanosleep_time64) |
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| 26 | static_assert( |
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| 27 | sizeof(time_t) == sizeof(int64_t), |
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| 28 | "SYS_clock_gettime64 requires struct timespec with 64-bit members." ); |
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| 29 | int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_nanosleep_time64, |
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| 30 | CLOCK_REALTIME, 0, req, rem); |
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| 31 | #else |
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| 32 | #error "SYS_nanosleep and SYS_clock_nanosleep_time64 syscalls not available." |
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| 33 | #endif |
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| 34 | |
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| 35 | if (ret < 0) { |
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| 36 | libc_errno = -ret; |
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| 37 | return -1; |
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| 38 | } |
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| 39 | return ret; |
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| 40 | } |
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| 41 | |
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| 42 | } // namespace LIBC_NAMESPACE_DECL |
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| 43 | |
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