top.c

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/* Author: Ben Gras <beng@few.vu.nl>  17 march 2006 */

#define _MINIX 1
#define _POSIX_SOURCE 1

#include <stdio.h>
#include <pwd.h>
#include <curses.h>
#include <timers.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <termcap.h>
#include <termios.h>
#include <time.h>
#include <string.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>

#include <sys/ioc_tty.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>

#include <minix/ipc.h>
#include <minix/config.h>
#include <minix/type.h>
#include <minix/const.h>

#include "../../servers/pm/mproc.h"
#include "../../kernel/const.h"
#include "../../kernel/proc.h"

#define  TC_BUFFER  1024        /* Size of termcap(3) buffer    */
#define  TC_STRINGS  200        /* Enough room for cm,cl,so,se  */

char *Tclr_all;

int print_memory(struct pm_mem_info *pmi)
{
        int h;
        int largest_bytes = 0, total_bytes = 0; 
        for(h = 0; h < _NR_HOLES; h++) {
                if(pmi->pmi_holes[h].h_base && pmi->pmi_holes[h].h_len) {
                        int bytes;
                        bytes = pmi->pmi_holes[h].h_len << CLICK_SHIFT;
                        if(bytes > largest_bytes) largest_bytes = bytes;
                        total_bytes += bytes;
                }
        }

        printf("Mem: %dK Free, %dK Contiguous Free\n",
                total_bytes/1024, largest_bytes/1024);

        return 1;
}

int print_load(double *loads, int nloads)
{
        int i;
        printf("load averages: ");
        for(i = 0; i < nloads; i++)
                printf("%s %.2f", (i > 0) ? "," : "", loads[i]);
        printf("\n");
        return 1;
}

#define PROCS (NR_PROCS+NR_TASKS)

int print_proc_summary(struct proc *proc)
{
        int p, alive, running, sleeping;

        alive = running = sleeping = 0;

        for(p = 0; p < PROCS; p++) {
                if(p - NR_TASKS == IDLE)
                        continue;
                if(proc[p].p_rts_flags & SLOT_FREE)
                        continue;
                alive++;
                if(proc[p].p_rts_flags & ~SLOT_FREE)
                        sleeping++;
                else
                        running++;
        }
        printf("%d processes: %d running, %d sleeping\n",
                alive, running, sleeping);
        return 1;
}

static struct tp {
        struct proc *p;
        int ticks;
} tick_procs[PROCS];

int cmp_ticks(const void *v1, const void *v2)
{
        struct tp *p1 = (struct tp *) v1, *p2 = (struct tp *) v2;
        if(p1->ticks < p2->ticks)
                return 1;
        if(p1->ticks > p2->ticks)
                return -1;
        if(p1->p->p_nr < p2->p->p_nr)
                return -1;
        if(p1->p->p_nr > p2->p->p_nr)
                return 1;
        return 0;
}

void print_procs(int maxlines,
        struct proc *proc1, struct proc *proc2, int dt,
        struct mproc *mproc)
{
        int p, nprocs, tot=0;
        int idleticks = 0, kernelticks = 0, systemticks = 0;

        if(dt < 1) return;

        for(p = nprocs = 0; p < PROCS; p++) {
                if(proc2[p].p_rts_flags & SLOT_FREE)
                        continue;
                tick_procs[nprocs].p = proc2 + p;
                if(proc1[p].p_endpoint == proc2[p].p_endpoint) {
                        tick_procs[nprocs].ticks =
                                proc2[p].p_user_time-proc1[p].p_user_time;
                } else {
                        tick_procs[nprocs].ticks =
                                proc2[p].p_user_time;
                }
                if(p-NR_TASKS == IDLE) {
                        idleticks = tick_procs[nprocs].ticks;
                        continue;
                }

                /* Kernel task time, not counting IDLE */
                if(proc2[p].p_nr < 0)
                        kernelticks += tick_procs[nprocs].ticks;
                else if(mproc[proc2[p].p_nr].mp_procgrp == 0)
                        systemticks += tick_procs[nprocs].ticks;
                nprocs++;
        }

        qsort(tick_procs, nprocs, sizeof(tick_procs[0]), cmp_ticks);

        printf("CPU states: %6.2f%% user, %6.2f%% system, %6.2f%% kernel, %6.2f%% idle",
                100.0*(dt-systemticks-kernelticks-idleticks)/dt,
                100.0*systemticks/dt,
                100.0*kernelticks/dt,
                100.0*idleticks/dt);
        printf("\n\n");
        maxlines -= 2;

        printf("  PID USERNAME PRI NICE   SIZE STATE   TIME     CPU COMMAND\n");
        maxlines--;
        for(p = 0; p < nprocs; p++) {
                int euid = 0;
                struct proc *pr;
                int pnr, ticks;
                char *name = "";
                static struct passwd *who = NULL;
                static int last_who = -1;

                if(maxlines-- <= 0) break;

                pnr = tick_procs[p].p->p_nr;
                pr = tick_procs[p].p;
                ticks = pr->p_user_time;
                if(pnr >= 0) {
                        printf("%5d ", mproc[pnr].mp_pid);
                        euid = mproc[pnr].mp_effuid;
                        name = mproc[pnr].mp_name;
                } else  {
                        printf("[%3d] ", pnr);
                        name = pr->p_name;
                }
                if(last_who != euid || !who) {
                        who = getpwuid(euid);
                        last_who = euid;
                }

                if(who && who->pw_name) printf("%-8s ", who->pw_name);
                else if(pnr >= 0) printf("%8d ", mproc[pnr].mp_effuid);
                else printf("         ");

                printf(" %2d ", pr->p_priority);
                if(pnr >= 0) {
                        printf(" %3d ", mproc[pnr].mp_nice);
                } else printf("     ");
                printf("%5dK",
                        ((pr->p_memmap[T].mem_len + 
                        pr->p_memmap[D].mem_len) << CLICK_SHIFT)/1024);
                printf("%6s", pr->p_rts_flags ? "" : "RUN");
                printf(" %3d:%02d ", (ticks/HZ/60), (ticks/HZ)%60);

                printf("%6.2f%% %s\n",
                        100.0*tick_procs[p].ticks/dt, name);
        }
}

void showtop(int r)
{
#define NLOADS 3
        double loads[NLOADS];
        int nloads, i, p, lines = 0;
        static struct proc prev_proc[PROCS], proc[PROCS];
        struct winsize winsize;
        static struct pm_mem_info pmi;
        static int prev_uptime, uptime;
        static struct mproc mproc[NR_PROCS];
        struct tms tms;

        uptime = times(&tms);

        if(ioctl(STDIN_FILENO, TIOCGWINSZ, &winsize) != 0) {
                perror("TIOCGWINSZ");
                fprintf(stderr, "TIOCGWINSZ failed\n");
                exit(1);
        }

        if(getsysinfo(PM_PROC_NR, SI_MEM_ALLOC, &pmi) < 0) {
                fprintf(stderr, "getsysinfo() for SI_MEM_ALLOC failed.\n");
                exit(1);;
        }

        if(getsysinfo(PM_PROC_NR, SI_KPROC_TAB, proc) < 0) {
                fprintf(stderr, "getsysinfo() for SI_KPROC_TAB failed.\n");
                exit(1);
        }

        if(getsysinfo(PM_PROC_NR, SI_PROC_TAB, mproc) < 0) {
                fprintf(stderr, "getsysinfo() for SI_PROC_TAB failed.\n");
                exit(1);
        }

        if((nloads = getloadavg(loads, NLOADS)) != NLOADS) {
                fprintf(stderr, "getloadavg() failed - %d loads\n", nloads);
                exit(1);
        }


        printf("%s", Tclr_all);

        lines += print_load(loads, NLOADS);
        lines += print_proc_summary(proc);
        lines += print_memory(&pmi);

        if(winsize.ws_row > 0) r = winsize.ws_row;

        print_procs(r - lines - 2, prev_proc,
                proc, uptime-prev_uptime, mproc);

        memcpy(prev_proc, proc, sizeof(prev_proc));
        prev_uptime = uptime;
}

void init(int *rows)
{
        char  *term;
        static char   buffer[TC_BUFFER], strings[TC_STRINGS];
        char *s = strings, *v;

        *rows = 0;

        if(!(term = getenv("TERM"))) {
                fprintf(stderr, "No TERM set\n");
                exit(1);
        }

        if ( tgetent( buffer, term ) != 1 ) {
                fprintf(stderr, "tgetent failed for term %s\n", term);
                exit(1);
        }

        if ( (Tclr_all = tgetstr( "cl", &s )) == NULL )
                Tclr_all = "\f";

        if((v = tgetstr ("li", &s)) != NULL)
                sscanf(v, "%d", rows);
        if(*rows < 1) *rows = 24;
        if(!initscr()) {
                fprintf(stderr, "initscr() failed\n");
                exit(1);
        }
        cbreak();
        nl();
}

void sigwinch(int sig) { }

int main(int argc, char *argv[])
{
        int r, c, s = 0, orig;

        init(&r);

        while((c=getopt(argc, argv, "s:")) != EOF) {
                switch(c) {
                        case 's':
                                s = atoi(optarg);
                                break;
                        default:
                                fprintf(stderr,
                                        "Usage: %s [-s<secdelay>]\n", argv[0]);
                                return 1;
                }
        }

        if(s < 1) 
                s = 2;

        /* Catch window size changes so display is updated properly right away. */
        signal(SIGWINCH, sigwinch);

        while(1) {
                fd_set fds;
                int ns;
                struct timeval tv;
                showtop(r);
                tv.tv_sec = s;
                tv.tv_usec = 0;

                FD_ZERO(&fds);
                FD_SET(STDIN_FILENO, &fds);
                if((ns=select(STDIN_FILENO+1, &fds, NULL, NULL, &tv)) < 0
                        && errno != EINTR) {
                        perror("select");
                        sleep(1);
                }

                if(ns > 0 && FD_ISSET(STDIN_FILENO, &fds)) {
                        char c;
                        if(read(STDIN_FILENO, &c, 1) == 1) {
                                switch(c) {
                                        case 'q':
                                                return 0;
                                                break;
                                }
                        }
                }
        }

        return 0;
}

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