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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
char obuf[32], ibuf[1024];
int n, max = 0;
if (argc > 2)
max = atoi(argv[2]);
if (!max)
max = 600;
memset(obuf, 0xff, sizeof(obuf));
for (n = 1; n <= max; ++n) {
int fd, ret;
fd = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, 0644);
printf("%d/%d: open fd = %d\n", n, max, fd);
ret = write(fd, obuf, sizeof(obuf));
printf("write ret = %d\n", ret);
sleep(1);
ret = write(fd, obuf, sizeof(obuf));
printf("write ret = %d\n", ret);
ret = pread(fd, ibuf, sizeof(ibuf), 0);
printf("pread ret = %d\n", ret);
if (memcmp(obuf, ibuf, sizeof(obuf))) {
printf("mismatch\n");
close(fd);
break;
}
close(fd);
}
return 0;
}
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