lib.txt

操作系统设计与实现源码

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01460	};

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
			src/lib/ansi/clock.c	 	 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

01500	/*
01501	 * clock - determine the processor time used
01502	 */
01503	/* $Header: clock.c,v 1.3 90/01/22 13:08:11 eck Exp $ */
01504	
01505	#include        <time.h>
01506	
01507	#if     defined(__BSD4_2)
01508	
01509	struct timeval {
01510	        long    tv_sec;                 /* seconds */
01511	        long    tv_usec;                /* and microseconds */
01512	};
01513	
01514	#define RUSAGE_SELF     0
01515	#define RUSAGE_CHILDREN -1
01516	
01517	struct rusage {
01518	        struct timeval ru_utime;        /* user time used */
01519	        struct timeval ru_stime;        /* system time used */
01520	        long    ru_maxrss;
01521	        long    ru_ixrss;               /* integral shared memory size */
01522	        long    ru_idrss;               /* integral unshared data size */
01523	        long    ru_isrss;               /* integral unshared stack size */
01524	        long    ru_minflt;              /* page reclaims */
01525	        long    ru_majflt;              /* page faults */
01526	        long    ru_nswap;               /* swaps */
01527	        long    ru_inblock;             /* block input operations */
01528	        long    ru_oublock;             /* block output operations */
01529	        long    ru_msgsnd;              /* messages sent */
01530	        long    ru_msgrcv;              /* messages received */
01531	        long    ru_nsignals;            /* signals received */
01532	        long    ru_nvcsw;               /* voluntary context switches */
01533	        long    ru_nivcsw;              /* involuntary context switches */
01534	};
01535	
01536	void _getrusage(int who, struct rusage *rusage);
01537	
01538	#elif   defined(_POSIX_SOURCE) || defined(__USG)
01539	
01540	struct tms {
01541	        time_t  tms_utime;              /* user time */
01542	        time_t  tms_stime;              /* system time */
01543	        time_t  tms_cutime;             /* user time, children */
01544	        time_t  tms_cstime;             /* system time, children */
01545	};
01546	
01547	clock_t _times(struct tms *buffer);
01548	
01549	#else                                   /* Version 7 UNIX */
01550	
01551	struct tbuffer {
01552	        long proc_user_time;
01553	        long proc_system_time;
01554	        long child_user_time;
01555	        long child_system_time;
01556	};
01557	
01558	clock_t _times(struct tbuffer *buffer);
01559	
01560	#endif
01561	
01562	clock_t
01563	clock(void)
01564	{
01565	#if     defined(__BSD4_2)
01566	        struct rusage rusage;
01567	
01568	        _getrusage(RUSAGE_SELF, &rusage);
01569	
01570	        return (((unsigned long)rusage.ru_utime.tv_sec * CLOCKS_PER_SEC)
01571	                + rusage.ru_utime.tv_usec);
01572	#elif   defined(_POSIX_SOURCE) || defined(__USG)
01573	        struct tms tms;
01574	
01575	        _times(&tms);
01576	        /* Assume that time_t can be converted to clock_t for Sys5 */
01577	        return tms.tms_utime;
01578	#else
01579	        struct tbuffer tbuffer;
01580	
01581	        _times(&tbuffer);
01582	        return tbuffer.proc_user_time;
01583	#endif
01584	}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
			src/lib/ansi/ctime.c	 	 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

01600	/*
01601	 * ctime - convers the calendar time to a string
01602	 */
01603	/* $Header: ctime.c,v 1.1 89/06/12 15:21:16 eck Exp $ */
01604	
01605	#include        <time.h>
01606	
01607	char *
01608	ctime(const time_t *timer)
01609	{
01610	        return asctime(localtime(timer));
01611	}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
			src/lib/ansi/difftime.c	 	 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

01700	/*
01701	 * difftime - compute the difference between two calendar times
01702	 */
01703	/* $Header: difftime.c,v 1.4 90/09/11 10:18:44 eck Exp $ */
01704	
01705	#include        <time.h>
01706	
01707	double
01708	difftime(time_t time1, time_t time0)
01709	{
01710	        /* be careful: time_t may be unsigned */
01711	        if ((time_t)-1 > 0 && time0 > time1) {
01712	                return - (double) (time0 - time1);
01713	        } else {
01714	                return (double)(time1 - time0);
01715	        }
01716	}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
			src/lib/ansi/div.c	 	 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

01800	/*
01801	 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
01802	 * See the copyright notice in the ACK home directory, in the file "Copyright".
01803	 */
01804	/* $Header: div.c,v 1.3 90/03/05 13:47:53 eck Exp $ */
01805	
01806	#include        <stdlib.h>
01807	
01808	static int tmp = -1;
01809	
01810	div_t
01811	div(register int numer, register int denom)
01812	{
01813	        div_t r;
01814	
01815	        /* The assignment of tmp should not be optimized !! */
01816	        if (tmp == -1) {
01817	                tmp = (tmp / 2 == 0);
01818	        }