cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sched/sched_setscheduler.c -o sched/sched_setscheduler -D_POSIX_C_SOURCE=202405L -lm -lpthread -lnetwork -lbsd -latomic
sched/sched_setscheduler.c:6:54: error: 'sched_setscheduler' undeclared here (not in a function)
    6 | int (*foo)(pid_t, int, const struct sched_param *) = sched_setscheduler;
      |                                                      ^~~~~~~~~~~~~~~~~~