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Improved NetBSD current-process detection from Roy Marples.

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This commit is contained in:
Nicholas Marriott 2009-07-15 17:53:15 +00:00
parent 222b8e6743
commit 6fe25a08d7
1 changed files with 75 additions and 11 deletions
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86
osdep-netbsd.c
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@ -1,4 +1,4 @@
/* $Id: osdep-netbsd.c,v 1.4 2009-06-26 15:54:52 nicm Exp $ */
/* $Id: osdep-netbsd.c,v 1.5 2009-07-15 17:53:15 nicm Exp $ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
@ -18,14 +18,18 @@
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif
#define is_runnable(p) \
((p)->p_stat == LSRUN || (p)->p_stat == SIDL)
#define is_stopped(p) \
((p)->p_stat == SSTOP || (p)->p_stat == SZOMB)
char *osdep_get_name(int, char *);
@ -33,20 +37,80 @@ char *
osdep_get_name(int fd, __unused char *tty)
{
int mib[6];
size_t len;
struct kinfo_proc2 p;
struct stat sb;
size_t len, i;
struct kinfo_proc2 *buf, *newbuf, *p, *bestp;
char *name;
if (stat(tty, &sb) == -1)
return (NULL);
if ((mib[3] = tcgetpgrp(fd)) == -1)
return (NULL);
buf = NULL;
len = sizeof(p);
mib[0] = CTL_KERN;
mib[1] = KERN_PROC2;
mib[2] = KERN_PROC_PID;
mib[4] = sizeof(p);
mib[5] = 1;
if (sysctl(mib, nitems(mib), &p, &len, NULL, 0) == -1)
mib[2] = KERN_PROC_PGRP;
mib[4] = sizeof (*buf);
mib[5] = 0;
retry:
if (sysctl(mib, __arraycount(mib), NULL, &len, NULL, 0) == -1)
return (NULL);
return (strdup(p.p_comm));
if ((newbuf = realloc(buf, len * sizeof (*buf))) == NULL) {
free(buf);
return (NULL);
}
buf = newbuf;
mib[5] = len / sizeof(*buf);
if (sysctl(mib, __arraycount(mib), buf, &len, NULL, 0) == -1) {
if (errno == ENOMEM)
goto retry; /* possible infinite loop? */
free(buf);
return (NULL);
}
bestp = NULL;
for (i = 0; i < len / sizeof (*buf); i++) {
if (buf[i].p_tdev != sb.st_rdev)
continue;
p = &buf[i];
if (bestp == NULL) {
bestp = p;
continue;
}
if (is_runnable(p) && !is_runnable(bestp))
bestp = p;
else if (!is_runnable(p) && is_runnable(bestp))
continue;
if (!is_stopped(p) && is_stopped(bestp))
bestp = p;
else if (is_stopped(p) && !is_stopped(bestp))
continue;
if (p->p_estcpu > bestp->p_estcpu)
bestp = p;
else if (p->p_estcpu < bestp->p_estcpu)
continue;
if (p->p_slptime < bestp->p_slptime)
bestp = p;
else if (p->p_slptime > bestp->p_slptime)
continue;
if (p->p_pid > bestp->p_pid)
bestp = p;
}
name = NULL;
if (bestp != NULL)
name = strdup(bestp->p_comm);
free(buf);
return (name);
}