sts.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Fri, 19 Nov 2010 12:05:57 +0100
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permissions -rw-r--r--
Simplified IPv6 aware ddos demo committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * sts.c: show time stamp
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 * Copyright (C) 2010 Markus Broeker
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <errno.h>
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void usage (char *name)
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{
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    printf ("Usage: %s STAMP [BOOT-STAMP]\n", name);
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    exit (EXIT_FAILURE);
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}
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time_t parse (char *buf)
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{
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    time_t sec = 0;
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    time_t milli = 0;
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    if (sscanf (buf, "%ld.%ld", &sec, &milli) != 2) {
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        fprintf (stderr, "  sec: %ld, ", sec);
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        fprintf (stderr, "milli: %ld\n", milli);
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    }
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    return sec;
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}
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time_t getboottime ()
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{
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    char buf[80];
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    time_t now = time (NULL);
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    FILE *f = fopen ("/proc/uptime", "r");
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    if (f == NULL) {
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        perror ("FOPEN");
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        return EXIT_FAILURE;
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    }
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    if (fgets (buf, sizeof (buf), f) == NULL) {
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        perror ("FOPEN");
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        exit (errno);
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    }
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    fclose (f);
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    return now - parse (buf);
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}
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int main (int argc, char **argv)
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{
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    time_t boot;
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    time_t stamp = 0;
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    time_t diff;
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    if (argc < 2)
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        usage (argv[0]);
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    stamp = parse (argv[1]);
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    if (argc == 3) {
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        boot = parse (argv[2]);
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    } else
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        boot = getboottime ();
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    diff = boot + stamp;
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    printf ("%s: %s", argv[1], ctime (&diff));
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    return EXIT_SUCCESS;
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}