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Replace pscomp() with a cleaner version, mostly written by bde (*).

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This corrects a problem of lost-precision for `-r' (sort-by-CPU).  Also,
for sort-by-CPU and sort-by-memory, any processes which have the same
value CPU or MEMORY are now sorted by TTY and then (if needed) by pid.

(* - I just added the NODEV checks, after doing some testing of my own)

Submitted by:	bde
MFC after:	1 week
This commit is contained in:
Garance A Drosehn 2004-03-30 01:45:23 +00:00
parent 653681fb30
commit 5bd7b1f3c0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=127596
1 changed files with 42 additions and 13 deletions
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55
bin/ps/ps.c
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@ -1024,20 +1024,49 @@ saveuser(KINFO *ki)
static int
pscomp(const void *a, const void *b)
{
int i;
#define VSIZE(k) ((k)->ki_p->ki_dsize + (k)->ki_p->ki_ssize + \
(k)->ki_p->ki_tsize)
const KINFO *ka, *kb;
double cpua, cpub;
segsz_t sizea, sizeb;
if (sortby == SORTCPU)
return (getpcpu((const KINFO *)b) - getpcpu((const KINFO *)a));
if (sortby == SORTMEM)
return (VSIZE((const KINFO *)b) - VSIZE((const KINFO *)a));
i = (int)((const KINFO *)a)->ki_p->ki_tdev -
(int)((const KINFO *)b)->ki_p->ki_tdev;
if (i == 0)
i = ((const KINFO *)a)->ki_p->ki_pid -
((const KINFO *)b)->ki_p->ki_pid;
return (i);
ka = a;
kb = b;
/* SORTCPU and SORTMEM are sorted in descending order. */
if (sortby == SORTCPU) {
cpua = getpcpu(ka);
cpub = getpcpu(kb);
if (cpua < cpub)
return (1);
if (cpua > cpub)
return (-1);
}
if (sortby == SORTMEM) {
sizea = ka->ki_p->ki_tsize + ka->ki_p->ki_dsize +
ka->ki_p->ki_ssize;
sizeb = kb->ki_p->ki_tsize + kb->ki_p->ki_dsize +
kb->ki_p->ki_ssize;
if (sizea < sizeb)
return (1);
if (sizea > sizeb)
return (-1);
}
/*
* TTY's are sorted in ascending order, except that all NODEV
* processes come before all processes with a device.
*/
if (ka->ki_p->ki_tdev == NODEV && kb->ki_p->ki_tdev != NODEV)
return (-1);
if (ka->ki_p->ki_tdev != NODEV && kb->ki_p->ki_tdev == NODEV)
return (1);
if (ka->ki_p->ki_tdev < kb->ki_p->ki_tdev)
return (-1);
if (ka->ki_p->ki_tdev > kb->ki_p->ki_tdev)
return (1);
/* PID's are sorted in ascending order. */
if (ka->ki_p->ki_pid < kb->ki_p->ki_pid)
return (-1);
if (ka->ki_p->ki_pid > kb->ki_p->ki_pid)
return (1);
return (0);
}
/*