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Split the comparison into a function to make this code smaller and more

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understandable.
This commit is contained in:
Nicholas Marriott 2009-08-03 17:12:07 +00:00
parent ac54dee9bb
commit 189fb08e13
1 changed files with 60 additions and 58 deletions
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116
procname.c
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@ -34,8 +34,56 @@
#define is_stopped(p) \ #define is_stopped(p) \
((p)->p_stat == SSTOP || (p)->p_stat == SZOMB || (p)->p_stat == SDEAD) ((p)->p_stat == SSTOP || (p)->p_stat == SZOMB || (p)->p_stat == SDEAD)
struct proc *cmp_procs(struct proc *, struct proc *);
char *get_proc_name(int, char *); char *get_proc_name(int, char *);
struct proc *
cmp_procs(struct proc *p1, struct proc *p2)
{
void *ptr1, *ptr2;
if (is_runnable(p1) && !is_runnable(p2))
return (p1);
if (!is_runnable(p1) && is_runnable(p2))
return (p2);
if (is_stopped(p1) && !is_stopped(p2))
return (p1);
if (!is_stopped(p1) && is_stopped(p2))
return (p2);
if (p1->p_estcpu > p2->p_estcpu)
return (p1);
if (p1->p_estcpu < p2->p_estcpu)
return (p2);
if (p1->p_slptime < p2->p_slptime)
return (p1);
if (p1->p_slptime > p2->p_slptime)
return (p2);
if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
return (p1);
if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
return (p2);
ptr1 = LIST_FIRST(&p1->p_children);
ptr2 = LIST_FIRST(&p2->p_children);
if (ptr1 == NULL && ptr2 != NULL)
return (p1);
if (ptr1 != NULL && ptr2 == NULL)
return (p2);
if (strcmp(p1->p_comm, p2->p_comm) < 0)
return (p1);
if (strcmp(p1->p_comm, p2->p_comm) > 0)
return (p2);
if (p1->p_pid > p2->p_pid)
return (p1);
return (p2);
}
char * char *
get_proc_name(int fd, char *tty) get_proc_name(int fd, char *tty)
{ {
@ -59,17 +107,14 @@ retry:
return (NULL); return (NULL);
len = (len * 5) / 4; len = (len * 5) / 4;
if ((newbuf = realloc(buf, len)) == NULL) { if ((newbuf = realloc(buf, len)) == NULL)
free(buf); goto error;
return (NULL);
}
buf = newbuf; buf = newbuf;
if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) { if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
if (errno == ENOMEM) if (errno == ENOMEM)
goto retry; goto retry;
free(buf); goto error;
return (NULL);
} }
bestp = NULL; bestp = NULL;
@ -77,57 +122,10 @@ retry:
if (buf[i].kp_eproc.e_tdev != sb.st_rdev) if (buf[i].kp_eproc.e_tdev != sb.st_rdev)
continue; continue;
p = &buf[i].kp_proc; p = &buf[i].kp_proc;
if (bestp == NULL) { if (bestp == NULL)
bestp = p; bestp = &buf[i].kp_proc;
continue; else
} bestp = cmp_procs(&buf[i].kp_proc, bestp);
if (is_runnable(p) && !is_runnable(bestp)) {
bestp = p;
continue;
} else if (!is_runnable(p) && is_runnable(bestp))
continue;
if (!is_stopped(p) && is_stopped(bestp)) {
bestp = p;
continue;
} else if (is_stopped(p) && !is_stopped(bestp))
continue;
if (p->p_estcpu > bestp->p_estcpu) {
bestp = p;
continue;
} else if (p->p_estcpu < bestp->p_estcpu)
continue;
if (p->p_slptime < bestp->p_slptime) {
bestp = p;
continue;
} else if (p->p_slptime > bestp->p_slptime)
continue;
if (p->p_flag & P_SINTR && !(bestp->p_flag & P_SINTR)) {
bestp = p;
continue;
} else if (!(p->p_flag & P_SINTR) && bestp->p_flag & P_SINTR)
continue;
if (LIST_FIRST(&p->p_children) == NULL &&
LIST_FIRST(&bestp->p_children) != NULL) { /* XXX ugh */
bestp = p;
continue;
} else if (LIST_FIRST(&p->p_children) != NULL &&
LIST_FIRST(&bestp->p_children) == NULL)
continue;
if (strcmp(p->p_comm, bestp->p_comm) < 0) {
bestp = p;
continue;
} else if (strcmp(p->p_comm, bestp->p_comm) > 0)
continue;
if (p->p_pid > bestp->p_pid)
bestp = p;
} }
name = NULL; name = NULL;
@ -136,4 +134,8 @@ retry:
free(buf); free(buf);
return (name); return (name);
error:
free(buf);
return (NULL);
} }