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/*******************************************************************************
* Header Files *
*******************************************************************************/
//#define _XOPEN_SOURCE
//#define _BSD_SOURCE
#include <sys/time.h>
#include <sys/stat.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
volatile unsigned long g_cInts = 0;
static void SigAlaramHandler(int iSig)
{
g_cInts++;
(void)iSig;
}
int main(int argc, char **argv)
{
struct itimerval TmrVal;
void (*rcSig)(int);
int i;
int rc;
char szName[256];
/*
* Set up the timer signal.
*/
rcSig = bsd_signal(SIGALRM, SigAlaramHandler);
if (rcSig == SIG_ERR)
{
fprintf(stderr, "bsd_signal failed: %s\n", strerror(errno));
return 1;
}
if (argc == 2) /* testing... */
siginterrupt(SIGALRM, 1);
memset(&TmrVal, '\0', sizeof(TmrVal));
TmrVal.it_interval.tv_sec = TmrVal.it_value.tv_sec = 0;
TmrVal.it_interval.tv_usec = TmrVal.it_value.tv_usec = 1;
rc = setitimer(ITIMER_REAL, &TmrVal, NULL);
if (rc != 0)
{
fprintf(stderr, "setitimer failed: %s\n", strerror(errno));
return 1;
}
printf("interval %d.%06d\n", (int)TmrVal.it_interval.tv_sec, (int)TmrVal.it_interval.tv_usec);
/*
* Do path related stuff.
*/
snprintf(szName, sizeof(szName), "%s/fooled/you", argv[0]);
for (i = 0; i < 100*1000*1000; i++)
{
struct stat St;
rc = stat(argv[0], &St);
if (rc == 0)
rc = stat(szName, &St);
if (rc != 0 && errno == EINTR)
{
printf("iteration %d: stat: %s (%u)\n", i, strerror(errno), errno);
break;
}
if ((i % 100000) == 0)
{
printf(".");
if ((i % 1000000) == 0)
printf("[%u/%lu]", i, g_cInts);
fflush(stdout);
}
}
if (!rc)
printf("No EINTR in %d iterations - system is working nicely!\n", i);
TmrVal.it_interval.tv_sec = TmrVal.it_value.tv_sec = 0;
TmrVal.it_interval.tv_usec = TmrVal.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &TmrVal, NULL);
return rc ? 1 : 0;
}
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