time.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

		    case '%':		/* Literal '%'.  */
			putc ('%', fp);
			break;
		    case 'C':		/* The command that got timed.  */
			fprintargv (fp, command, " ");
			break;
		    case 'D':		/* Average unshared data size.  */
			fprintf (fp, "%lu",
				MSEC_TO_TICKS (v) == 0 ? 0 :
				ptok ((UL) resp->ru.ru_idrss) / MSEC_TO_TICKS (v) +
				ptok ((UL) resp->ru.ru_isrss) / MSEC_TO_TICKS (v));
			break;
		    case 'E':		/* Elapsed real (wall clock) time.  */
			if (resp->elapsed.tv_sec >= 3600)	/* One hour -> h:m:s.  */
			    fprintf (fp, "%ldh %ldm %02lds",
				    resp->elapsed.tv_sec / 3600,
				    (resp->elapsed.tv_sec % 3600) / 60,
				    resp->elapsed.tv_sec % 60);
			else
			    fprintf (fp, "%ldm %ld.%02lds",	/* -> m:s.  */
				    resp->elapsed.tv_sec / 60,
				    resp->elapsed.tv_sec % 60,
				    resp->elapsed.tv_usec / 10000);
			break;
		    case 'F':		/* Major page faults.  */
			fprintf (fp, "%ld", resp->ru.ru_majflt);
			break;
		    case 'I':		/* Inputs.  */
			fprintf (fp, "%ld", resp->ru.ru_inblock);
			break;
		    case 'K':		/* Average mem usage == data+stack+text.  */
			fprintf (fp, "%lu",
				MSEC_TO_TICKS (v) == 0 ? 0 :
				ptok ((UL) resp->ru.ru_idrss) / MSEC_TO_TICKS (v) +
				ptok ((UL) resp->ru.ru_isrss) / MSEC_TO_TICKS (v) +
				ptok ((UL) resp->ru.ru_ixrss) / MSEC_TO_TICKS (v));
			break;
		    case 'M':		/* Maximum resident set size.  */
			fprintf (fp, "%lu", ptok ((UL) resp->ru.ru_maxrss));
			break;
		    case 'O':		/* Outputs.  */
			fprintf (fp, "%ld", resp->ru.ru_oublock);
			break;
		    case 'P':		/* Percent of CPU this job got.  */
			/* % cpu is (total cpu time)/(elapsed time).  */
			if (r > 0)
			    fprintf (fp, "%lu%%", (v * 100 / r));
			else
			    fprintf (fp, "?%%");
			break;
		    case 'R':		/* Minor page faults (reclaims).  */
			fprintf (fp, "%ld", resp->ru.ru_minflt);
			break;
		    case 'S':		/* System time.  */
			fprintf (fp, "%ld.%02ld",
				resp->ru.ru_stime.tv_sec,
				resp->ru.ru_stime.TV_MSEC / 10);
			break;
		    case 'T':		/* System time.  */
			if (resp->ru.ru_stime.tv_sec >= 3600)	/* One hour -> h:m:s.  */
			    fprintf (fp, "%ldh %ldm %02lds",
				    resp->ru.ru_stime.tv_sec / 3600,
				    (resp->ru.ru_stime.tv_sec % 3600) / 60,
				    resp->ru.ru_stime.tv_sec % 60);
			else
			    fprintf (fp, "%ldm %ld.%02lds",	/* -> m:s.  */
				    resp->ru.ru_stime.tv_sec / 60,
				    resp->ru.ru_stime.tv_sec % 60,
				    resp->ru.ru_stime.tv_sec / 10000);
			break;
		    case 'U':		/* User time.  */
			fprintf (fp, "%ld.%02ld",
				resp->ru.ru_utime.tv_sec,
				resp->ru.ru_utime.TV_MSEC / 10);
			break;
		    case 'u':		/* User time.  */
			if (resp->ru.ru_utime.tv_sec >= 3600)	/* One hour -> h:m:s.  */
			    fprintf (fp, "%ldh %ldm %02lds",
				    resp->ru.ru_utime.tv_sec / 3600,
				    (resp->ru.ru_utime.tv_sec % 3600) / 60,
				    resp->ru.ru_utime.tv_sec % 60);
			else
			    fprintf (fp, "%ldm %ld.%02lds",	/* -> m:s.  */
				    resp->ru.ru_utime.tv_sec / 60,
				    resp->ru.ru_utime.tv_sec % 60,
				    resp->ru.ru_utime.tv_sec / 10000);
			break;
		    case 'W':		/* Times swapped out.  */
			fprintf (fp, "%ld", resp->ru.ru_nswap);
			break;
		    case 'X':		/* Average shared text size.  */
			fprintf (fp, "%lu",
				MSEC_TO_TICKS (v) == 0 ? 0 :
				ptok ((UL) resp->ru.ru_ixrss) / MSEC_TO_TICKS (v));
			break;
		    case 'Z':		/* Page size.  */
			fprintf (fp, "%d", getpagesize ());
			break;
		    case 'c':		/* Involuntary context switches.  */
			fprintf (fp, "%ld", resp->ru.ru_nivcsw);
			break;
		    case 'e':		/* Elapsed real time in seconds.  */
			fprintf (fp, "%ld.%02ld",
				resp->elapsed.tv_sec,
				resp->elapsed.tv_usec / 10000);
			break;
		    case 'k':		/* Signals delivered.  */
			fprintf (fp, "%ld", resp->ru.ru_nsignals);
			break;
		    case 'p':		/* Average stack segment.  */
			fprintf (fp, "%lu",
				MSEC_TO_TICKS (v) == 0 ? 0 :
				ptok ((UL) resp->ru.ru_isrss) / MSEC_TO_TICKS (v));
			break;
		    case 'r':		/* Incoming socket messages received.  */
			fprintf (fp, "%ld", resp->ru.ru_msgrcv);
			break;
		    case 's':		/* Outgoing socket messages sent.  */
			fprintf (fp, "%ld", resp->ru.ru_msgsnd);
			break;
		    case 't':		/* Average resident set size.  */
			fprintf (fp, "%lu",
				MSEC_TO_TICKS (v) == 0 ? 0 :
				ptok ((UL) resp->ru.ru_idrss) / MSEC_TO_TICKS (v));
			break;
		    case 'w':		/* Voluntary context switches.  */
			fprintf (fp, "%ld", resp->ru.ru_nvcsw);
			break;
		    case 'x':		/* Exit status.  */
			fprintf (fp, "%d", WEXITSTATUS (resp->waitstatus));
			break;
		    case '\0':
			putc ('?', fp);
			return;
		    default:
			putc ('?', fp);
			putc (*fmt, fp);
		}
		++fmt;
		break;

	    case '\\':		/* Format escape.  */
		switch (*++fmt)
		{
		    case 't':
			putc ('\t', fp);
			break;
		    case 'n':
			putc ('\n', fp);
			break;
		    case '\\':
			putc ('\\', fp);
			break;
		    default:
			putc ('?', fp);
			putc ('\\', fp);
			putc (*fmt, fp);
		}
		++fmt;
		break;

	    default:
		putc (*fmt++, fp);
	}

	if (ferror (fp))
	    error_msg_and_die("write error");
    }
    putc ('\n', fp);

    if (ferror (fp))
	error_msg_and_die("write error");
}

/* Run command CMD and return statistics on it.
   Put the statistics in *RESP.  */
static void run_command (char *const *cmd, resource_t *resp)
{
    pid_t pid;			/* Pid of child.  */
    __sighandler_t interrupt_signal, quit_signal;

    gettimeofday (&resp->start, (struct timezone *) 0);
    pid = fork ();		/* Run CMD as child process.  */
    if (pid < 0)
	error_msg_and_die("cannot fork");
    else if (pid == 0)
    {				/* If child.  */
	/* Don't cast execvp arguments; that causes errors on some systems,
	   versus merely warnings if the cast is left off.  */
	execvp (cmd[0], cmd);
	error_msg("cannot run %s", cmd[0]);
	_exit (errno == ENOENT ? 127 : 126);
    }

    /* Have signals kill the child but not self (if possible).  */
    interrupt_signal = signal (SIGINT, SIG_IGN);
    quit_signal = signal (SIGQUIT, SIG_IGN);

    if (resuse_end (pid, resp) == 0)
	error_msg("error waiting for child process");

    /* Re-enable signals.  */
    signal (SIGINT, interrupt_signal);
    signal (SIGQUIT, quit_signal);
}

extern int time_main (int argc, char **argv)
{
    int gotone;
    resource_t res;
    const char *output_format = default_format;

    argc--;
    argv++;
    /* Parse any options  -- don't use getopt() here so we don't
     * consume the args of our client application... */
    while (argc > 0 && **argv == '-') {
	gotone = 0;
	while (gotone==0 && *++(*argv)) {
	    switch (**argv) {
		case 'v':
		    output_format = long_format;
		    break;
		case 'p':
		    output_format = posix_format;
		    break;
		default:
		    show_usage();
	    }
	    argc--;
	    argv++;
	    gotone = 1;
	}
    }

    if (argv == NULL || *argv == NULL)
	show_usage();

    run_command (argv, &res);
    summarize (stdout, output_format, argv, &res);
    fflush (stdout);

    if (WIFSTOPPED (res.waitstatus))
	exit (WSTOPSIG (res.waitstatus));
    else if (WIFSIGNALED (res.waitstatus))
	exit (WTERMSIG (res.waitstatus));
    else if (WIFEXITED (res.waitstatus))
	exit (WEXITSTATUS (res.waitstatus));
    return 0;
}