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//===-- Linux implementation of nanosleep function ------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/time/nanosleep.h"
#include "hdr/stdint_proxy.h" // For int64_t.
#include "hdr/time_macros.h"
#include "src/__support/OSUtil/syscall.h" // For syscall functions.
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include <sys/syscall.h> // For syscall numbers.
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, nanosleep,
(const struct timespec *req, struct timespec *rem)) {
#if SYS_nanosleep
int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_nanosleep, req, rem);
#elif defined(SYS_clock_nanosleep_time64)
static_assert(
sizeof(time_t) == sizeof(int64_t),
"SYS_clock_gettime64 requires struct timespec with 64-bit members.");
int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_clock_nanosleep_time64,
CLOCK_REALTIME, 0, req, rem);
#else
#error "SYS_nanosleep and SYS_clock_nanosleep_time64 syscalls not available."
#endif
if (ret < 0) {
libc_errno = -ret;
return -1;
}
return ret;
}
} // namespace LIBC_NAMESPACE_DECL
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