libc/src/signal/linux/kill.cpp

//===-- Linux implementation of kill --------------------------------------===//
//
// 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/signal/kill.h"

#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/errno/libc_errno.h"
#include "src/signal/linux/signal_utils.h"

#include <signal.h>
#include <sys/syscall.h> // For syscall numbers.

namespace LIBC_NAMESPACE_DECL {

LLVM_LIBC_FUNCTION(int, kill, (pid_t pid, int sig)) {
  int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_kill, pid, sig);

  // A negative return value indicates an error with the magnitude of the
  // value being the error code.
  if (ret != 0) {
    libc_errno = (ret > 0 ? ret : -ret);
    return -1;
  }

  return ret; // always 0
}

} // namespace LIBC_NAMESPACE_DECL