Van wrote:
>
> Greetings:
>
> Working on a shell based application that does an insert when a shell is started,
> and, needs to update that record on exit.
>
> You can't set an environment value back to the parent process, so would a fork()
> make the most sense?
>
> This currently works in a bash shell .profile implementation.
> MYSQL_REC_NO=`date '+%Y%m%d_%H%M%S'`
>
> I want to do this in a c application, instead.
> setenv("MYSQL_REC_NO",THE_DATE, 1); only works within the program and
> MYSQL_REC_NO dies on return from main.
>
> Anyone doing something similar?
>
> Regards,
> Van
Greetings:
No need to reply. Just closing this discussion and providing what might save
someone else some time if ever faced with a similar situation. Of course, if
any Windows programmer wants to port a static version of this I wouldn't be
offended to not have to do the work myself. >:)
Since the shell app requires a shell and is only useful to a shell session, it
doesn't make much sense to create a shell from a shell that only needs to record
when the parent shell has exited. The following implementation does the job
without incurring more overhead by a fork() than adding an environment variable:
In .profile add:
`~/btimeshell -s -K$TICKET_NO`
trap "~/btimeshell -s -K$TICKET_NO --CALL_TYPE='Log Out'" 0
The first call sets the environment variable, and, the second call uses the
environment variable when it receives sig 0 {pretty much undefined, but, seems
to be SIG_EXIT, or something similar}.
Main calls:
my_init();
load_defaults ("my", groups, &argc, &argv);
/* among many other things along with processing */
Relevant structure info for load_defaults:
struct option long_options[] =
{
/* some stuff */
{"CALL_TYPE", optional_argument, NULL, 'T'},
{"TICKET_NO", optional_argument, NULL, 'K'},
/* more stuff */
{0,0,0,0}
};
And, the while call:
while ((opt = getopt_long (argc, argv, "T::U::u::C::B::K::p::vhsrS",
long_options, &option_index)) != EOF)
Which grabs the TICKET_NO variable if present in the environment in:
case 'K':
/* Set TICKET_NO */
TICKET_NO = optarg;
setenv("TICKET_NO", TICKET_NO, 1);
TICKET_NO = ticket_no();
strncpy(syscmd, "export TICKET_NO=", sizeof(syscmd));
strncat (syscmd, TICKET_NO, sizeof(syscmd));
system (syscmd);
printf("%s\n", syscmd);
break;
The above printf call when enclosed within a `{some command}` construct exports
the TICKET_NO variable to the shell so a fork isn't necessary. It's the only
variable necessary for the trap 0 call in .profile to pair up with the initial
insert that assigned the TICKET_NO variable.
The ticket_no() function follows:
char *ticket_no()
/* Set the Ticket Number, Return formatted */
{
struct tm *datetime; /* For current time */
time_t t;
static char ticket_no[15+1];
if (getenv("TICKET_NO") != NULL &&
strlen(getenv("TICKET_NO")) == 15)
/* For passing an existing TICKET_NO, unless it's been monkeyed with */
{
strncpy (ticket_no, getenv("TICKET_NO"), sizeof(ticket_no));
} else {
/* Get the current date and format it for the Ticket # */
tzset();
time(&t);
datetime = localtime(&t);
if ( t == -1) {
perror("Time is munged");
exit(EXIT_FAILURE);
}
strftime(ticket_no, sizeof(ticket_no), "%Y%m%d_%H%M%S", datetime);
}
return ticket_no;
}
--
Regards,
Van
--
=================================================================
Linux rocks!!! http://www.dedserius.com/
=================================================================
---------------------------------------------------------------------
Before posting, please check:
http://www.mysql.com/manual.php (the manual)
http://lists.mysql.com/ (the list archive)
To request this thread, e-mail <[EMAIL PROTECTED]>
To unsubscribe, e-mail <[EMAIL PROTECTED]>
Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
