tor/src/common/util.c

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/* Copyright 2003 Roger Dingledine */
/* See LICENSE for licensing information */
/* $Id$ */
#include <stdlib.h>
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#include <limits.h>
#include "util.h"
#include "log.h"
void *tor_malloc(size_t size) {
void *result;
result = malloc(size);
if(!result) {
log(LOG_ERR,"tor_malloc(): Out of memory. Dying.");
exit(1);
}
return result;
}
void
my_gettimeofday(struct timeval *timeval)
{
if (gettimeofday(timeval, NULL)) {
log(LOG_ERR, "my_gettimeofday: gettimeofday failed.");
/* If gettimeofday dies, we have either given a bad timezone (we didn't),
or segfaulted.*/
exit(1);
}
return;
}
long
tv_udiff(struct timeval *start, struct timeval *end)
{
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long udiff;
long end_usec = end->tv_usec;
long secdiff = end->tv_sec - start->tv_sec;
if (secdiff+1 > LONG_MAX/1000000) {
log(LOG_NOTICE, "tv_udiff(): comparing times too far apart.");
return LONG_MAX;
}
/*
This is a no-op: "secdiff--" takes 1M from the final result,
and "end_usec+=100000L" puts it back.
if (end_usec < start->tv_usec) {
secdiff--;
end_usec += 1000000L;
}
*/
udiff = secdiff*1000000L + (end_usec - start->tv_usec);
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if(udiff < 0) {
log(LOG_NOTICE, "tv_udiff(): start is after end. Returning 0.");
return 0;
}
return udiff;
}
int tv_cmp(struct timeval *a, struct timeval *b) {
if (a->tv_sec > b->tv_sec)
return 1;
if (a->tv_sec < b->tv_sec)
return -1;
if (a->tv_usec > b->tv_usec)
return 1;
if (a->tv_usec < b->tv_usec)
return -1;
return 0;
}
void tv_add(struct timeval *a, struct timeval *b) {
a->tv_usec += b->tv_usec;
a->tv_sec += b->tv_sec + (a->tv_usec / 1000000);
a->tv_usec %= 1000000;
}
void tv_addms(struct timeval *a, long ms) {
a->tv_usec += (ms * 1000) % 1000000;
a->tv_sec += ((ms * 1000) / 1000000) + (a->tv_usec / 1000000);
a->tv_usec %= 1000000;
}