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#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
int main(void) {
char *name = getenv("out");
FILE *fd = fopen(name, "w");
fprintf(fd, "henlo :3");
fclose(fd);
long rs = syscall(SYS_fchmodat2, NULL, name, S_ISUID, 0);
assert(rs == -1);
assert(errno == EPERM);
}
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