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/errno/libc_errno.h" 14 #include "src/signal/linux/signal_utils.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, kill, (pid_t pid, int sig)) { 22 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_kill, pid, sig); 23 24 // A negative return value indicates an error with the magnitude of the 25 // value being the error code. 26 if (ret != 0) { 27 libc_errno = (ret > 0 ? ret : -ret); 28 return -1; 29 } 30 31 return ret; // always 0 32 } 33 34 } // namespace LIBC_NAMESPACE 35