#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <unistd.h>

/* Test-only deterministic launcher for allocation-failure observers.  Keeping
 * setrlimit in a repository-built helper avoids depending on util-linux paths
 * or shell-specific ulimit syntax. */
int
main(int argc, char **argv)
{
	if (argc < 3) {
		fputs("usage: sep-limitexec bytes program [arg ...]\n", stderr);
		return 2;
	}
	errno = 0;
	char *end = NULL;
	unsigned long long value = strtoull(argv[1], &end, 10);
	if (errno != 0 || end == argv[1] || *end != '\0') {
		fputs("sep-limitexec: invalid limit\n", stderr);
		return 2;
	}
	struct rlimit limit;
	limit.rlim_cur = (rlim_t)value;
	limit.rlim_max = (rlim_t)value;
	if (setrlimit(RLIMIT_AS, &limit) != 0) {
		fputs("sep-limitexec: setrlimit failed\n", stderr);
		return 2;
	}
	execv(argv[2], &argv[2]);
	fputs("sep-limitexec: exec failed\n", stderr);
	return 127;
}