strerror() but more cursed

terror.c

#include <pthread.h>
#include <string.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

static void *fn (void *p)
{
	pthread_detach(pthread_self());
	clock_nanosleep(CLOCK_MONOTONIC, 0,
	                &(struct timespec)
	                {0, 100000000}, NULL);
	free(p);
	return NULL;
}

extern char const *terror (int e);
char const *terror (int e)
{
	char *s = strdup(strerror(e));
	pthread_create(&(pthread_t){0}, NULL, fn, s);
	return s;
}

int main (void)
{
	printf("%s\n%s\n%s\n",
	       strerror(-1),
	       strerror(-2),
	       strerror(-3));

	#define strerror terror
	printf("\n%s\n%s\n%s\n",
	       strerror(-1),
	       strerror(-2),
	       strerror(-3));

	return 0;
}