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/*******************************************************************************
* Header Files *
*******************************************************************************/
#define _BSD_SOURCE
#define _GNU_SOURCE
#include <sys/time.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <unistd.h>
/*******************************************************************************
* Global Variables *
*******************************************************************************/
/** The number of signals. */
static volatile long g_cSigs = 0;
/** Number of signals received on threads other than the main one. */
static volatile long g_cSigsOther = 0;
/** Whether to shutdown or not. */
static volatile int g_fShutdown = 0;
/** The handle of the main thread. */
static pthread_t g_hMainThread;
static void SigHandler(int iSig)
{
g_cSigs++;
if (pthread_self() != g_hMainThread)
g_cSigsOther++;
(void)iSig;
}
static void NanoSleep(unsigned long cNanoSecs)
{
struct timespec Ts;
Ts.tv_sec = 0;
Ts.tv_nsec = cNanoSecs;
nanosleep(&Ts, NULL);
}
static void *ThreadProc(void *pvIgnored)
{
int volatile i = 0;
while (!g_fShutdown)
{
// NanoSleep(850);
if (g_fShutdown)
break;
pthread_kill(g_hMainThread, SIGALRM);
for (i = 6666; i > 0; i--)
/* nothing */;
}
return NULL;
}
int main(int argc, char **argv)
{
void (*rcSig)(int);
pthread_t hThread;
char szName[1024];
int i;
int rc;
/*
* Set up the signal handlers.
*/
rcSig = bsd_signal(SIGALRM, SigHandler);
if (rcSig != SIG_ERR)
rcSig = bsd_signal(SIGCHLD, SigHandler);
if (rcSig == SIG_ERR)
{
fprintf(stderr, "bsd_signal failed: %s\n", strerror(errno));
return 1;
}
if (argc == 2) /* testing... */
{
siginterrupt(SIGALRM, 1);
siginterrupt(SIGCHLD, 1);
}
/*
* Kick off a thread that will signal us like there was no tomorrow.
*/
g_hMainThread = pthread_self();
rc = pthread_create(&hThread, NULL, ThreadProc, NULL);
if (rc != 0)
{
fprintf(stderr, "pthread_create failed: %s\n", strerror(rc));
return 1;
}
/*
* Do path related stuff.
*/
snprintf(szName, sizeof(szName), "%s-test2", argv[0]);
for (i = 0; i < 100*1000*1000; i++)
{
struct stat St;
int fd;
rc = stat(argv[0], &St);
if (rc == 0 || errno != EINTR)
rc = stat(szName, &St);
if (errno == EINTR && rc != 0)
{
printf("iteration %d: stat: %u\n", i, errno);
break;
}
fd = open(szName, O_CREAT | O_RDWR, 0666);
if (errno == EINTR && fd < 0)
{
printf("iteration %d: open: %u\n", i, errno);
break;
}
close(fd);
rc = unlink(szName);
if (errno == EINTR && rc != 0)
{
printf("iteration %d: unlink: %u\n", i, errno);
break;
}
/* Show progress info */
if ((i % 100000) == 0)
{
printf(".");
if ((i % 1000000) == 0)
printf("[%d/%ld/%ld]\n", i, g_cSigs, g_cSigsOther);
fflush(stdout);
}
}
g_fShutdown = 1;
if (rc)
printf("No EINTR in %d iterations - system is working nicely!\n", i);
NanoSleep(10000000);
return rc ? 1 : 0;
}
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