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Also stop/continue SIGTERM/SIGKILL are tested.

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This commit is contained in:
Vahagn Khachatryan
2015-03-03 11:33:36 +04:00
parent ac19e3f75a
commit 1c568045e8
1 changed files with 81 additions and 32 deletions
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103
linux/fork_wait_exit_status.cpp
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@@ -7,6 +7,7 @@ VIM-: let g:ldlibpath=g:Bboost.g:Btbb
VIM: let g:argv=""
*/
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <iostream>
@@ -16,29 +17,31 @@ VIM: let g:argv=""
#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 )
void print_status(const char * caption, int status)
{
std::cout << caption << ": ";
std::cout.flush();
if (WIFEXITED(status))
std::cout << "normal termination, exit status = " << WEXITSTATUS(status);
else if (WIFSIGNALED(status))
std::cout << "abnormal termination, signal number = "
<< WTERMSIG(status)
<< (WCOREDUMP(status) ? " (core file generated)" : "");
else if (WIFSTOPPED(status))
std::cout << "child stopped, signal number = " << WSTOPSIG(status);
else if (WIFCONTINUED(status))
std::cout << "child continued";
else
std::cout << "couldn't figure our exit reason. status = " << status;
std::cout << std::endl;
std::cout.flush();
}
template< class F>
pid_t fork_lambda( F&& f )
{
pid_t pid;
int status;
if ((pid = fork()) < 0)
throw std::runtime_error("fork error");
else if (pid == 0) /* child */
@@ -47,28 +50,74 @@ void fork_and_wait( const char * caption, F&& f )
exit(0);
}
else/*parent*/
{
if (wait(&status) != pid) /* wait for child */
return pid;
}
int wait_for_status( pid_t pid )
{
int status;
if (waitpid(pid,&status,WUNTRACED|WCONTINUED) != pid)
throw std::runtime_error("wait error");
pr_exit(status); /* and print its status */
}
return status;
}
void test()
{
fork_and_wait("exit(7)", [](){
pid_t pid;
//
// Normal exit.
//
pid = fork_lambda([](){
exit(7);
});
fork_and_wait("SIGABORT through abort()", [](){
print_status( "exit(7)", wait_for_status(pid) );
//
// Self aborting process.
//
pid = fork_lambda([](){
abort();
});
print_status( "SIGABORT through abort()", wait_for_status(pid) );
fork_and_wait("SIGFPE through divison by zero", [](){
int a = rand();
//
// Raise SIGFPE.
//
pid = fork_lambda([](){
volatile int a = rand();
int b = 0;
a /= b;
});
print_status( "SIGFPE through division by zero", wait_for_status(pid) );
//
// Kill process.
//
pid = fork_lambda([](){
while ( true );
});
if (kill( pid, SIGKILL ))
throw std::runtime_error("failed to send kill signal");
print_status( "SIGKILL is sent", wait_for_status(pid) );
//
// Stop process.
//
pid = fork_lambda([](){
while ( true );
});
if (kill( pid, SIGSTOP ))
throw std::runtime_error("failed to send stop signal");
print_status( "SIGSTOP is sent", wait_for_status(pid) );
//
// Resume process.
//
if (kill( pid, SIGCONT ))
throw std::runtime_error("failed to send continue signal");
print_status( "SIGCONT is sent", wait_for_status(pid) );
//
// Terminate process.
//
if (kill( pid, SIGTERM ))
throw std::runtime_error("failed to send termination signal");
print_status( "SIGTERM is sent", wait_for_status(pid) );
}
int main ( void )