int
main(int argc, char **argv)
{
dbc_t *dbc;
char *filename = NULL; /* default: stdin */
int c;
#if 0
extern int yydebug;
yydebug = 1;
#endif
verbose_flag = 0;
while (1) {
static struct option long_options[] = {
/* These options set a flag. */
{"verbose", no_argument, &verbose_flag, 1},
{"brief", no_argument, &verbose_flag, 0},
/* These options don't set a flag.
We distinguish them by their indices. */
{"dbc", required_argument, 0, 'd'},
{"networks",no_argument, &networks_flag, 'N'},
{"nodes" ,no_argument, &nodes_flag, 'n'},
{"envvars" ,no_argument, &envvars_flag, 'e'},
{"messages",no_argument, &messages_flag, 'm'},
{"signals" ,no_argument, &signals_flag, 's'},
{"valtables" ,no_argument, &valtables_flag, 't'},
{"help", no_argument, NULL, 'h'},
{0, 0, 0, 0}
};
/* getopt_long stores the option index here. */
int option_index = 0;
c = getopt_long (argc, argv, "d:Nnemst",
long_options, &option_index);
/* Detect the end of the options. */
if (c == -1)
break;
switch (c) {
case 0:
/* If this option set a flag, do nothing else now. */
if (long_options[option_index].flag != 0)
break;
printf ("option %s", long_options[option_index].name);
if (optarg)
printf (" with arg %s", optarg);
printf ("\n");
break;
case 'd': filename = optarg; break;
case 'N': networks_flag = 1; break;
case 'n': nodes_flag = 1; break;
case 'e': envvars_flag = 1; break;
case 'm': messages_flag = 1; break;
case 's': signals_flag = 1; break;
case 't': valtables_flag = 1; break;
case 'h': help(); exit(0); break;
case '?':
/* getopt_long already printed an error message. */
fprintf(stderr, "Typ `dbcls --help' for more information\n");
abort();
break;
default:
abort();
break;
}
}
if(NULL != (dbc = dbc_read_file(filename))) {
if(networks_flag) show_network(dbc);
if(messages_flag) show_message_list(dbc->message_list);
if(signals_flag) show_signals(dbc);
if(nodes_flag) show_nodes(dbc);
if(envvars_flag) show_envvars(dbc->envvar_list);
if(valtables_flag) show_valtable_list(dbc->valtable_list);
dbc_free(dbc);
}
return 0;
}
int main(int argc, char *argv[], char *envp[])
{
int i, pid, bytesread, ret;
char buf[256];
/* The following are for blocking certain signals */
sigset_t intrmask, oldmask;
/* The following variables are for the select() function */
fd_set readmask, writemask, exceptmask;
struct timeval timeout; /* contains tv_sec and tv_usec member variables */
printf("\nCurrent Signal Mask: ");
show_signals();
/* Block SIGCHLD and SIGQUIT by first zeroing out the masks, then adding
* SIGCHLD and SIGQUIT to the intrmask and then calling sigprocmask to
* block those signals */
sigemptyset(&intrmask);
sigemptyset(&oldmask);
sigaddset(&intrmask, SIGCHLD);
sigaddset(&intrmask, SIGQUIT);
sigprocmask(SIG_BLOCK, &intrmask, &oldmask);
/* Create a signal handler for CTRL-C which is SIGINT */
signal(SIGINT, ctrlc_handler);
printf("\nNew Signal Mask: ");
show_signals();
/* Enter select() loop. This will wait for activity on specified file
* descriptors or timeout if no activity is detected. select() watches for:
* Read activity (readmask)
* Write activity (writemask)
* Exceptions (exceptmask)
* select() is a blocking function. You will remain at the select() function
* call until there is activity or the function times out.
*/
pid = getpid();
printf("\nProcess ID: %d\n", pid);
printf("\nEnter a string at the prompt or wait for timeout.\n");
printf("Enter just a period on a line by itself to exit.\n\n");
printf("Try entering CTRL-C, CTRL-D and other signals at the prompt.\n");
printf("Also open a second terminal and try sending signals via kill, such as:\n");
printf(" kill -SIGCHLD %d\n", pid);
printf(" kill -SIGQUIT %d\n", pid);
printf(" kill -SIGINT %d\n", pid);
printf(" kill -SIGHUP %d\n", pid);
printf(" kill -SIGTERM %d\n", pid);
printf("NOTE: Some of the above will terminate the program. Restart to try more.\n");
printf("\n");
while(1)
{
printf("enter a line> ");
fflush(stdout);
bzero(buf, sizeof(buf)); /* Clear out the buffer */
/* The first step to using select is to zero out all the file descriptors
* in each mask */
FD_ZERO(&readmask);
FD_ZERO(&writemask);
FD_ZERO(&exceptmask);
/* The second step is to set all the file descriptors you wish to watch
* for each mask. Recall that the file descriptor for stdin is 0 and the
* file descriptor for stdout is 1. For a socket, the file descriptor is
* the integer returned by the socket() function */
FD_SET(0, &readmask); /* activiate stdin read */
FD_SET(0, &exceptmask); /* activiate stdin exception */
/* The third step is to set the timeout values. This is how long select()
* will wait for activity before giving up and returning */
timeout.tv_sec = SELECT_TIMEOUT; /* seconds */
timeout.tv_usec = 0; /* microseconds */
/* Now we are ready to call select(). We will wait here until something
* happens or the function times out */
ret = select(ULIMIT, &readmask, &writemask, &exceptmask, &timeout);
/* Now process the return value from timeout to see what happened */
if(ret == 0) /* timeout */
{
printf(" timeout!\n");
}
else if(ret < 0) /* error or signal interupt */
{
if(errno == EINTR)
{
printf("Signal interupted select!\n");
}
else
{
printf("Exception on select(), exiting loop...\n");
break;
}
}
/* Check if there was an exception on stdin */
else if(FD_ISSET(0, &exceptmask))
{
printf("Exception on select(), exiting loop...\n");
break;
}
/* Check if there's data on stdin waiting to be read */
else if(FD_ISSET(0, &readmask))
{
bytesread = read(0, buf, sizeof(buf));
/* Check for the period to end the connection and also convert any
* newlines into null characters */
for(i = 0 ; i < (sizeof(buf) - 1) ; i++)
{
if( (buf[i] == '\n') || (buf[i] == '\0') )
break;
}
if(buf[i] == '\n')
buf[i] = '\0'; /* get rid of newline */
if(buf[0] == '.') /* end of stream */
{
printf("Exiting select() loop at user's request...\n");
break; /* Exit out of loop */
}
else
{
printf("You typed: %s\n", buf);
}
}
fflush(stdout);
}
if(ctrlc_hit == 0)
{
printf("Please rerun the program and remember to hit CTRL-C at least once.\n");
}
return 0;
}
