Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/shell/xsh_kill.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_kill(ushort stdin, ushort stdout, ushort stderr,
                 ushort nargs, char *args[])
{
        long pid; /* pid for process to kill */

        /* Output help, if '--help' argument was supplied */
        if (nargs == 2 && strncmp(args[1],"--help",6) == 0) 
        {
                fprintf(stdout, "Kills a process number PID.\n");
                fprintf(stdout, "\t--help\t display this help and exit\n");
                return OK;
        }

        /* Check for correct number of arguments */
        if (nargs < 2) 
        {
                fprintf(stderr, "kill: missing operand\n");
                fprintf(stderr, "Try 'kill --help' for more information\n");
                return SYSERR;
        }
        if (nargs > 2) 
        {
                fprintf(stderr, "kill: too many arguments\n");
                fprintf(stderr, "Try 'kill --help' for more information\n");
                return SYSERR;
        }

        pid = atol(args[1]);

        /* Block killing of the null process */
        if (pid == NULLPROC)
        {
                fprintf(stderr, "kill: (%d) Operation not permitted\n",pid);
                return SYSERR;
        }

        /* Notify of killing of the shell */
        if (pid == getpid())
        {
                fprintf(stderr, "kill: Shell killed\n");
                sleep(2000);
        }

        /* Kill process, noting if kill failed */
        int result = kill(pid);
        if (result == SYSERR)
        {
                fprintf(stderr, "kill: (%d) No such process\n",pid);
        }

        return result;
}

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