gnunet-timeout.c File Reference

small tool starting a child process, waiting that it terminates or killing it after a given timeout period More...

#include "platform.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

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Functions
static void	sigchld_handler (int val)
static void	sigint_handler (int val)
int	main (int argc, char *argv[])

Variables
static pid_t	child

Detailed Description

small tool starting a child process, waiting that it terminates or killing it after a given timeout period

Author

Matthias Wachs

Definition in file gnunet-timeout.c.

Function Documentation

sigchld_handler()

static void sigchld_handler ( int  val )

static

Definition at line 39 of file gnunet-timeout.c.

{
  int status = 0;
  int ret = 0;
 
  (void) val;
  waitpid (child, &status, 0);
  if (WIFEXITED (status) != 0)
  {
    ret = WEXITSTATUS (status);
    _exit (ret);  /* return same status code */
  }
  if (WIFSIGNALED (status) != 0)
  {
    ret = WTERMSIG (status);
    kill (getpid (), ret); /* kill self with the same signal */
  }
  _exit (-1);
}

References child, ret, and status.

Referenced by main().

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sigint_handler()

static void sigint_handler ( int  val )

static

Definition at line 61 of file gnunet-timeout.c.

{
  kill (0, val);
  _exit (val);
}

Referenced by main().

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main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 69 of file gnunet-timeout.c.

{
  int timeout = 0;
  pid_t gpid = 0;
 
  if (argc < 3)
  {
    fprintf (stderr,
             "arg 1: timeout in sec., arg 2: executable, arg<n> arguments\n");
    exit (-1);
  }
 
  timeout = atoi (argv[1]);
 
  if (timeout == 0)
    timeout = 600;
 
  /* with getpgid() it does not compile, but getpgrp is the BSD version and working */
  gpid = getpgrp ();
 
  signal (SIGCHLD, sigchld_handler);
  signal (SIGABRT, sigint_handler);
  signal (SIGFPE, sigint_handler);
  signal (SIGILL, sigint_handler);
  signal (SIGINT, sigint_handler);
  signal (SIGSEGV, sigint_handler);
  signal (SIGTERM, sigint_handler);
 
  child = fork ();
  if (child == 0)
  {
    /*  int setpgrp(pid_t pid, pid_t pgid); is not working on this machine */
    // setpgrp (0, pid_t gpid);
    if (-1 != gpid)
      setpgid (0, gpid);
    execvp (argv[2], &argv[2]);
    exit (-1);
  }
  if (child > 0)
  {
    sleep (timeout);
    printf ("Child processes were killed after timeout of %u seconds\n",
            timeout);
    kill (0, SIGTERM);
    exit (3);
  }
  exit (-1);
}

References child, sigchld_handler(), sigint_handler(), and timeout.

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Variable Documentation

child

pid_t child

static

Definition at line 35 of file gnunet-timeout.c.

Referenced by get_file_information(), main(), mark_as_reachable(), and sigchld_handler().