Check whether the nice() function is available

refs #7115

CMakeLists.txt

@@ -133,6 +133,7 @@ endif()
 check_function_exists(vfork HAVE_VFORK)
 check_function_exists(backtrace_symbols HAVE_BACKTRACE_SYMBOLS)
 check_function_exists(pipe2 HAVE_PIPE2)
+check_function_exists(nice HAVE_NICE)
 check_library_exists(dl dladdr "dlfcn.h" HAVE_DLADDR)
 check_library_exists(execinfo backtrace_symbols "" HAVE_LIBEXECINFO)
 check_include_file_cxx(cxxabi.h HAVE_CXXABI_H)

config.h.cmake

@@ -8,6 +8,7 @@
 #cmakedefine HAVE_DLADDR
 #cmakedefine HAVE_LIBEXECINFO
 #cmakedefine HAVE_CXXABI_H
+#cmakedefine HAVE_NICE
 
 #cmakedefine ICINGA2_UNITY_BUILD
 

lib/base/process.cpp

@@ -527,8 +527,10 @@ void Process::Run(const boost::function<void(const ProcessResult&)>& callback)
 		(void)close(fds[0]);
 		(void)close(fds[1]);
 
+#ifdef HAVE_NICE
 		if (nice(5) < 0)
 			Log(LogWarning, "base", "Failed to renice child process.");
+#endif /* HAVE_NICE */
 
 		if (icinga2_execvpe(argv[0], argv, envp) < 0) {
 			char errmsg[512];