in xv6 system i have a program in c that shows process state- but afte.pdf

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in xv6 system i have a program in c that shows process state, but after i change Makefile, it not working, what i missed? this is the code called pstate.c #include "types.h" #include "stat.h" #include "user.h" int main(void) { struct proc *p; for (p = ptable.proc; p < &ptable.proc[NPROC]; p++) { if (p->state == UNUSED) { continue; } printf("%d %s\n", p->pid, states[p->state]); } exit(); } this is the error.

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