pracct.c

UNIX编程高级环境（第二版）的进程部分的程序源码

#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),
#ifdef	ACSTAT
                (unsigned char) acdata.ac_stat,
#else
				-1,
#endif
#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);
}