tool to dispatch URIs to the appropriate GNUnet helper process More...

#include "platform.h"
#include "gnunet_util_lib.h"

Include dependency graph for gnunet-uri.c:

Functions
static void	maint_child_death (void *cls)
	Task triggered whenever we receive a SIGCHLD (child process died) or when user presses CTRL-C. More...

static void	run (void cls, char const args, const char cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg)
	Main function that will be run by the scheduler. More...

static void	sighandler_child_death ()
	Signal handler called for SIGCHLD. More...

int	main (int argc, char const argv)
	The main function to handle gnunet://-URIs. More...

Variables
static long unsigned int	exit_code = 0
	Handler exit code. More...

static struct GNUNET_OS_Process *	p
	Helper process we started. More...

static struct GNUNET_DISK_PipeHandle *	sigpipe
	Pipe used to communicate shutdown via signal. More...

Detailed Description

tool to dispatch URIs to the appropriate GNUnet helper process

Author: Christian Grothoff

Definition in file gnunet-uri.c.

Function Documentation

◆ maint_child_death()

static void maint_child_death ( void * cls )

static

Task triggered whenever we receive a SIGCHLD (child process died) or when user presses CTRL-C.

Parameters

cls	closure, NULL

Definition at line 53 of file gnunet-uri.c.

{
  enum GNUNET_OS_ProcessStatusType type;
 
  (void) cls;
  if ((GNUNET_OK != GNUNET_OS_process_status (p, &type, &exit_code)) ||
      (type != GNUNET_OS_PROCESS_EXITED))
    GNUNET_break (0 == GNUNET_OS_process_kill (p, GNUNET_TERM_SIG));
  GNUNET_OS_process_destroy (p);
}

References exit_code, GNUNET_break, GNUNET_OK, GNUNET_OS_process_destroy(), GNUNET_OS_PROCESS_EXITED, GNUNET_OS_process_kill(), GNUNET_OS_process_status(), GNUNET_TERM_SIG, p, and type.

Referenced by run().

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◆ run()

static void run	(	void *	cls,
		char const	args,
		const char *	cfgfile,
		const struct GNUNET_CONFIGURATION_Handle *	cfg
	)

static

Main function that will be run by the scheduler.

Parameters

cls	closure
args	remaining command-line arguments
cfgfile	name of the configuration file used (for saving, can be NULL!)
cfg	configuration

Definition at line 74 of file gnunet-uri.c.

{
  const char *uri;
  const char *slash;
  char *subsystem;
  char *program;
  struct GNUNET_SCHEDULER_Task *rt;
 
  (void) cls;
  (void) cfgfile;
  if (NULL == (uri = args[0]))
  {
    fprintf (stderr, _ ("No URI specified on command line\n"));
    return;
  }
  if (0 != strncasecmp ("gnunet://", uri, strlen ("gnunet://")))
  {
    fprintf (stderr,
             _ ("Invalid URI: does not start with `%s'\n"),
             "gnunet://");
    return;
  }
  uri += strlen ("gnunet://");
  if (NULL == (slash = strchr (uri, '/')))
  {
    fprintf (stderr, _ ("Invalid URI: fails to specify subsystem\n"));
    return;
  }
  subsystem = GNUNET_strndup (uri, slash - uri);
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_string (cfg, "uri", subsystem, &program))
  {
    fprintf (stderr, _ ("No handler known for subsystem `%s'\n"), subsystem);
    GNUNET_free (subsystem);
    return;
  }
  GNUNET_free (subsystem);
  rt = GNUNET_SCHEDULER_add_read_file (
    GNUNET_TIME_UNIT_FOREVER_REL,
    GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ),
    &maint_child_death,
    NULL);
  p = GNUNET_OS_start_process (GNUNET_OS_INHERIT_STD_NONE,
                               NULL,
                               NULL,
                               NULL,
                               program,
                               program,
                               args[0],
                               NULL);
  GNUNET_free (program);
  if (NULL == p)
    GNUNET_SCHEDULER_cancel (rt);
}

References _, warningfilter::args, cfg, GNUNET_CONFIGURATION_get_value_string(), GNUNET_DISK_PIPE_END_READ, GNUNET_DISK_pipe_handle(), GNUNET_free, GNUNET_OK, GNUNET_OS_INHERIT_STD_NONE, GNUNET_OS_start_process(), GNUNET_SCHEDULER_add_read_file(), GNUNET_SCHEDULER_cancel(), GNUNET_strndup, GNUNET_TIME_UNIT_FOREVER_REL, maint_child_death(), p, sigpipe, subsystem, and uri.

Referenced by main().

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◆ sighandler_child_death()

static void sighandler_child_death ( void )

static

Signal handler called for SIGCHLD.

Triggers the respective handler by writing to the trigger pipe.

Definition at line 138 of file gnunet-uri.c.

{
  static char c;
  int old_errno = errno; /* back-up errno */
 
  GNUNET_break (
    1 ==
    GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle (sigpipe,
                                                     GNUNET_DISK_PIPE_END_WRITE)
                            ,
                            &c,
                            sizeof(c)));
  errno = old_errno; /* restore errno */
}

References GNUNET_break, GNUNET_DISK_file_write(), GNUNET_DISK_PIPE_END_WRITE, GNUNET_DISK_pipe_handle(), and sigpipe.

Referenced by main().

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◆ main()

int main	(	int	argc,
		char const	argv
	)

The main function to handle gnunet://-URIs.

Parameters

argc	number of arguments from the command line
argv	command line arguments

Returns: 0 ok, 1 on error

Definition at line 162 of file gnunet-uri.c.

{
  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_OPTION_END
  };
  struct GNUNET_SIGNAL_Context *shc_chld;
  int ret;
 
  sigpipe = GNUNET_DISK_pipe (GNUNET_DISK_PF_NONE);
  GNUNET_assert (sigpipe != NULL);
  shc_chld =
    GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD, &sighandler_child_death);
  ret = GNUNET_PROGRAM_run (GNUNET_OS_project_data_gnunet (),
                            argc,
                            argv,
                            "gnunet-uri URI",
                            gettext_noop (
                              "Perform default-actions for GNUnet URIs"),
                            options,
                            &run,
                            NULL);
  GNUNET_SIGNAL_handler_uninstall (shc_chld);
  shc_chld = NULL;
  GNUNET_DISK_pipe_close (sigpipe);
  sigpipe = NULL;
  return ((GNUNET_OK == ret) && (0 == exit_code)) ? 0 : 1;
}