libc/src/signal/linux/kill.cpp

   1 //===-- Linux implementation of kill --------------------------------------===//
   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/kill.h"
  10
  11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
  12 #include "src/__support/common.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15 #include "src/signal/linux/signal_utils.h"
  16
  17 #include <signal.h>
  18 #include <sys/syscall.h> // For syscall numbers.
  19
  20 namespace LIBC_NAMESPACE_DECL {
  21
  22 LLVM_LIBC_FUNCTION(int, kill, (pid_t pid, int sig)) {
  23   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_kill, pid, sig);
  24
  25   // A negative return value indicates an error with the magnitude of the
  26   // value being the error code.
  27   if (ret != 0) {
  28     libc_errno = (ret > 0 ? ret : -ret);
  29     return -1;
  30   }
  31
  32   return ret; // always 0
  33 }
  34
  35 } // namespace LIBC_NAMESPACE_DECL