libc/src/time/nanosleep.cpp

   1 //===-- Implementation of nanosleep function ------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/time/nanosleep.h"
  10
  11 #include "src/__support/OSUtil/syscall.h" // For syscall functions.
  12 #include "src/__support/common.h"
  13 #include "src/errno/libc_errno.h"
  14
  15 #include <sys/syscall.h> // For syscall numbers.
  16
  17 namespace __llvm_libc {
  18
  19 // TODO(michaelrj): Move this into time/linux with the other syscalls.
  20 LLVM_LIBC_FUNCTION(int, nanosleep,
  21                    (const struct timespec *req, struct timespec *rem)) {
  22   int ret = __llvm_libc::syscall_impl(SYS_nanosleep, req, rem);
  23   if (ret < 0) {
  24     libc_errno = -ret;
  25     return -1;
  26   }
  27   return ret;
  28 }
  29
  30 } // namespace __llvm_libc