#include <dlfcn.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>

typedef ssize_t (*f)(int fd, void *buf, size_t count);

ssize_t read(int fd, void *buf, size_t count)
{
    static f og_read = NULL;
    static int calls = 0;
    const int MAX_CALLS = getenv("MAX_READ_CALLS") ? atoi(getenv("MAX_READ_CALLS")) : -1;

    if (!og_read)
    {
        og_read = (f)dlsym(RTLD_NEXT, "read");
    }

    calls++;
    if (MAX_CALLS < 0 || calls <= MAX_CALLS)
    {
        return og_read(fd, buf, count);
    }
    errno = EBADF;
    return -1;
}