Date: Mon, 12 Feb 2001 18:00:15 -0600 From: Lucas Bergman <lucas@slb.to> To: Doug Young <dougy@bryden.apana.org.au> Cc: freebsd-questions@freebsd.org Subject: Re: Scripting issue - pppd Message-ID: <20010212180015.A16376@billygoat.slb.to> In-Reply-To: <02a601c09432$54a5c6c0$847e03cb@apana.org.au>; from dougy@bryden.apana.org.au on Sun, Feb 11, 2001 at 11:55:40PM %2B1000 References: <02a601c09432$54a5c6c0$847e03cb@apana.org.au>
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> I need to setup a script to disconnect dialin (pppd) users after
> they have been online for more than 8 hours in any one 24 hour
> period but haven't a clue where to start.
Finding out how long a process has been running from the shell is the
hard part of this task. The following C program will tell you how
long (in seconds) a process has been running.
For example, if I do
% gcc -Wall -O -o howlong howlong.c
% ./howlong 1
2592578
I get that `init' has been running 2.59 million seconds, or just a
smidge over 30 days. This makes sense, since
% uptime
5:57PM up 30 days, 6 mins, 1 user, load averages: 0.07, 0.02, 0.00
Note that this program is FreeBSD-specific, since it uses /proc
in an essential way.
The rest of your problem should be easy, if not trivial, shell
scripting; good luck.
Lucas
-------------- begin howlong.c --------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
void usage();
int
main(int argc, char **av)
{
unsigned long pid, start;
char *end;
char procdir[80]; /* never overflows, if av[1] is valid */
char starttime[20]; /* never overflows */
FILE *f;
int c, field, i = 0;
if (argc != 2) { usage(); exit(1); }
pid = strtoul(av[1], &end, 10);
if (*end) { usage(); exit(1); }
strcpy(procdir, "/proc/");
strcat(procdir, av[1]);
if (chdir(procdir) == -1) {
fprintf(stderr, "howlong: fatal: could not change to %s\n", procdir);
fprintf(stderr, "Probably, the process ID %s is not running.\n", av[1]);
exit(2);
}
f = fopen("status", "r");
if (!f) {
fprintf(stderr, "howlong: panic: could not open %s/status\n", procdir);
exit(3);
}
field = 1;
while (field < 8 && (c = fgetc(f)) >= 0) if ((char) c == ' ') ++field;
if (c == EOF) {
fclose(f);
fprintf(stderr, "howlong: panic: could not get time field from status\n");
exit(4);
}
while ((c = fgetc(f)) >= 0 && ((char) c != ',')) {
if (i > 18) {
/* we would overflow starttime */
fclose(f);
fprintf(stderr, "howlong: panic: bad start time in status\n");
exit(5);
}
starttime[i++] = (char) c;
}
fclose(f);
starttime[i] = 0;
start = strtoul(starttime, &end, 10);
if (*end) {
fprintf(stderr, "howlong: panic: bad start time in status\n");
exit(6);
}
printf("%ld\n", time(0) - start);
return 0;
}
void
usage()
{
fprintf(stderr, "usage: howlong pid\n");
}
-------------- end howlong.c ----------------------
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