pracct.c

APUE(第二版)的随书源代码,与第一版的代码相比增加了一些章节的代码(详见第二版的说明)

#include	<sys/types.h>
#include	<sys/acct.h>
#include	"ourhdr.h"

#define	ACCTFILE		"/var/adm/pacct"
static unsigned long	compt2ulong(comp_t);

int
main(void)
{
	struct acct		acdata;
	FILE			*fp;

	if ( (fp = fopen(ACCTFILE, "r")) == NULL)
		err_sys("can't open %s", ACCTFILE);
	while (fread(&acdata, sizeof(acdata), 1, fp) == 1) {
		printf("%-*.*s  e = %6ld, chars = %7ld, "
			   "stat = %3u: %c %c %c %c\n", sizeof(acdata.ac_comm),
				sizeof(acdata.ac_comm), acdata.ac_comm,
				compt2ulong(acdata.ac_etime), compt2ulong(acdata.ac_io),
				(unsigned char) acdata.ac_stat,
#ifdef	ACORE		/* SVR4 doesn't define ACORE */
				acdata.ac_flag & ACORE ? 'D' : ' ',
#else
											   ' ',
#endif
#ifdef	AXSIG		/* SVR4 doesn't define AXSIG */
				acdata.ac_flag & AXSIG ? 'X' : ' ',
#else
											   ' ',
#endif
				acdata.ac_flag & AFORK ? 'F' : ' ',
				acdata.ac_flag & ASU   ? 'S' : ' ');
	}
	if (ferror(fp))
		err_sys("read error");
	exit(0);
}

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

	val = comptime & 017777;	/* 13-bit fraction */
	exp = (comptime >> 13) & 7;	/* 3-bit exponent (0-7) */
	while (exp-- > 0)
		val *= 8;
	return(val);
}