pracct.c

UNIX环境高级编程第二版（英文版）配书的源代码

#include "apue.h"
#include <sys/acct.h>

#ifdef HAS_SA_STAT
#define FMT "%-*.*s  e = %6ld, chars = %7ld, stat = %3u: %c %c %c %c\n"
#else
#define FMT "%-*.*s  e = %6ld, chars = %7ld, %c %c %c %c\n"
#endif
#ifndef HAS_ACORE
#define ACORE 0
#endif
#ifndef HAS_AXSIG
#define AXSIG 0
#endif

static unsigned long
compt2ulong(comp_t comptime)	/* convert comp_t to unsigned long */
{
	unsigned long	val;
	int				exp;

	val = comptime & 0x1fff;	/* 13-bit fraction */
	exp = (comptime >> 13) & 7;	/* 3-bit exponent (0-7) */
	while (exp-- > 0)
		val *= 8;
	return(val);
}
int
main(int argc, char *argv[])
{
	struct acct		acdata;
	FILE			*fp;

	if (argc != 2)
		err_quit("usage: pracct filename");
	if ((fp = fopen(argv[1], "r")) == NULL)
		err_sys("can't open %s", argv[1]);
	while (fread(&acdata, sizeof(acdata), 1, fp) == 1) {
		printf(FMT, (int)sizeof(acdata.ac_comm),
			(int)sizeof(acdata.ac_comm), acdata.ac_comm,
			compt2ulong(acdata.ac_etime), compt2ulong(acdata.ac_io),
#ifdef HAS_SA_STAT
			(unsigned char) acdata.ac_stat,
#endif
			acdata.ac_flag & ACORE ? 'D' : ' ',
			acdata.ac_flag & AXSIG ? 'X' : ' ',
			acdata.ac_flag & AFORK ? 'F' : ' ',
			acdata.ac_flag & ASU   ? 'S' : ' ');
	}
	if (ferror(fp))
		err_sys("read error");
	exit(0);
}