79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* getusage.c
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* 64-bit versions of fseeko/ftello()
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/port/getrusage.c,v 1.5 2004/06/24 18:53:48 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "c.h"
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#include "rusagestub.h"
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/* This code works on:
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* univel
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* solaris_i386
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* sco
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* solaris_sparc
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* svr4
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* hpux 9.*
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* which currently is all the supported platforms that don't have a
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* native version of getrusage(). So, if configure decides to compile
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* this file at all, we just use this version unconditionally.
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*/
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int
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getrusage(int who, struct rusage * rusage)
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{
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#ifdef WIN32
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if (rusage)
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memset(rusage, 0, sizeof(rusage));
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#else
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struct tms tms;
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int tick_rate = CLK_TCK; /* ticks per second */
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clock_t u,
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s;
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if (rusage == (struct rusage *) NULL)
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{
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errno = EFAULT;
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return -1;
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}
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if (times(&tms) < 0)
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{
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/* errno set by times */
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return -1;
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}
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switch (who)
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{
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case RUSAGE_SELF:
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u = tms.tms_utime;
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s = tms.tms_stime;
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break;
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case RUSAGE_CHILDREN:
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u = tms.tms_cutime;
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s = tms.tms_cstime;
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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#define TICK_TO_SEC(T, RATE) ((T)/(RATE))
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#define TICK_TO_USEC(T,RATE) (((T)%(RATE)*1000000)/RATE)
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rusage->ru_utime.tv_sec = TICK_TO_SEC(u, tick_rate);
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rusage->ru_utime.tv_usec = TICK_TO_USEC(u, tick_rate);
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rusage->ru_stime.tv_sec = TICK_TO_SEC(s, tick_rate);
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rusage->ru_stime.tv_usec = TICK_TO_USEC(u, tick_rate);
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#endif
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return 0;
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}
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