Teting fork and wait.

linux/fork_wait.cpp

@@ -0,0 +1,91 @@
+/*
+VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
+VIM-: let g:cppflags=g:Iboost.g:Itbb
+VIM-: let g:ldflags=g:Lboost.g:Ltbb.g:tbbmalloc.g:tbbmproxy
+VIM-: let g:ldlibpath=g:Bboost.g:Btbb
+VIM: let g:argv=""
+*/
+#include <unistd.h>
+#include <sys/wait.h>
+
+#include <iostream>
+#include <stdexcept>
+
+#ifndef WCOREDUMP
+#define WCOREDUMP(status) (0)
+#endif
+
+void pr_exit(int status)
+{
+	if (WIFEXITED(status))
+		std::cout << "normal termination, exit status =" 
+					<<  WEXITSTATUS(status) << std::endl;
+	else if (WIFSIGNALED(status))
+		std::cout << "abnormal termination, signal number = " 
+					<< WTERMSIG(status)
+					<< (WCOREDUMP(status) ? " (core file generated)" : "")
+					<< std::endl;
+	else if (WIFSTOPPED(status))
+		std::cout << "child stopped, signal number = "
+					<<  WSTOPSIG(status) << std::endl;
+}
+
+template< class F>
+void fork_and_wait( const char * caption, F&& f )
+{
+	std::cout << caption << ": ";
+	std::cout.flush();
+
+	pid_t pid;
+	int status;
+	if ((pid = fork()) < 0)
+		throw std::runtime_error("fork error");
+	else if (pid == 0) /* child */
+	{
+		f();
+		exit(0);
+	}
+	else/*parent*/
+	{
+		if (wait(&status) != pid) /* wait for child */
+			throw std::runtime_error("wait	error");
+		pr_exit(status); /* and print its status */
+	}
+}
+
+void test()
+{
+	fork_and_wait("exit(7)", [](){
+			exit(7);
+	});
+
+	fork_and_wait("SIGABORT through abort()", [](){
+			abort();
+	});
+	
+	fork_and_wait("SIGFPE through divison by zero", [](){
+			int a = rand();
+			int b = 0;
+			a /= b;
+	});
+}
+
+int main ( void )
+{try{
+	test();
+	return 0;
+}
+catch ( const std::exception& e )
+{
+	std::cerr << std::endl
+			<< "std::exception(\"" << e.what() << "\")." << std::endl;
+	return 2;
+}
+catch ( ... )
+{
+	std::cerr  << std::endl
+			<< "unknown exception." << std::endl;
+	return 1;
+}}
+