#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/param.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <stdlib.h>

void print_error(int i, int err, char* desc)
{
    char buf[1024];

    if (strerror_r(err, buf, sizeof(buf)) != 0)
    {
        snprintf(buf, sizeof(buf), "Unknown error (%d)", err);
    }

    fprintf(stderr, "[%d] [%d] [%d] %s (%d): %s\n", getpid(), time(NULL), i, desc, err, buf);
}

int main()
{
    char path[MAXPATHLEN];
    size_t len = sizeof(path);
    int i;

    {
        struct timeval now;
        gettimeofday(&now, NULL);
        srand(now.tv_usec);
    }

    for (i = 0; i < 10; ++i)
    {
        int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
        if (sysctl(mib, 4, path, &len, NULL, 0) == -1)
        {
            print_error(i, errno, "sysctl() failed");
        }

        if (readlink("/proc/curproc/file", path, sizeof(path)) == -1)
        {
            print_error(i, errno, "readlink() failed");
        }

        struct timespec const delay = {0, 10000000 + 100000 * (rand() % 41)};
        nanosleep(&delay, NULL);
    }

    return 0;
}