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

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

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

command xsh_sleep(ushort stdin, ushort stdout, ushort stderr,
                  ushort nargs, char *args[])
{
        long delay; /* time to sleep */

        /* Output help, if '--help' argument was supplied */
        if (nargs == 2 && strncmp(args[1],"--help",6) == 0) 
        {
                fprintf(stdout, "Usage:sleep DELAY\n");
                fprintf(stdout, "Sleep for DELAY seconds.\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,"sleep: missing operand\n");
                fprintf(stderr,"Try 'sleep --help' for more information\n");
                return SYSERR;
        }
        if (nargs > 2)
        {
                fprintf(stderr,"sleep: too many arguments\n");
                fprintf(stderr,"Try 'sleep --help' for more information\n");
                return SYSERR;
        }

        /* Calculate delay and sleep */
        delay = atol(args[1]);
        if (delay < 0)
        {
                fprintf(stderr,"sleep: invalid delay of %d seconds\n");
        }
        return sleep(delay * 1000);
}

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