libc/src/signal/linux/sigprocmask.cpp

   1 //===-- Linux implementation of sigprocmask -------------------------------===//
   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/signal/sigprocmask.h"
  10 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
  11 #include "src/errno/libc_errno.h"
  12 #include "src/signal/linux/signal_utils.h"
  13
  14 #include "src/__support/common.h"
  15
  16 #include <signal.h>
  17 #include <sys/syscall.h> // For syscall numbers.
  18
  19 namespace LIBC_NAMESPACE {
  20
  21 LLVM_LIBC_FUNCTION(int, sigprocmask,
  22                    (int how, const sigset_t *__restrict set,
  23                     sigset_t *__restrict oldset)) {
  24   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_rt_sigprocmask, how, set,
  25                                               oldset, sizeof(sigset_t));
  26   if (!ret)
  27     return 0;
  28
  29   libc_errno = -ret;
  30   return -1;
  31 }
  32
  33 } // namespace LIBC_NAMESPACE