Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/shell/xsh_ps.c

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/* Embedded XINU, Copyright (C) 2007.  All rights reserved. */

#include <kernel.h>
#include <proc.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

command xsh_ps(ushort stdin, ushort stdout, ushort stderr,
               ushort nargs, char *args[])
{
        pcb   *ppcb; /* pointer to process entry */
        uchar i;     /* temp variable            */

        /* readable names for PR* status in proc.h */
        char *pstnams[] =
        { "curr ", "free ", "ready", "recv ",
          "sleep", "susp ", "wait ", "rtim " };

        /* Output help, if '--help' argument was supplied */
        if (nargs == 2 && strncmp(args[1],"--help",6) == 0)
        {
                fprintf(stdout, "Usage: ps\n");
                fprintf(stdout, "Displays a table of running processes.\n");
                fprintf(stdout, "\t--help\t display this help and exit\n");

                return OK;
        }

        /* Check for correct number of arguments */
        if (nargs > 1) 
        {
                fprintf(stderr, "ps: too many arguments\n");
                fprintf(stderr, "Try 'ps --help' for more information\n");
                return SYSERR;
        }

        /* Output process table header */
        fprintf(stdout,
          "PID NAME         STATE PRIO PPID STACK BASE STACK PTR  STACK LEN \n");
        fprintf(stdout,
          "--- ------------ ----- ---- ---- ---------- ---------- ----------\n");

        /* Output information for each process */
        for ( i = 0; i < NPROC; i++ )
        {
                ppcb = &proctab[i];
                if (ppcb->state == PRFREE) { continue; }

                fprintf(stdout, "%3d %-12s %s %4d %4d 0x%08X 0x%08X %10d\n", 
                                i, ppcb->name, pstnams[(int)ppcb->state-1],
                        ppcb->prio, ppcb->parent, ppcb->stkbase,
                        ppcb->stkptr, ppcb->stklen);
        }

        return OK;
}

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