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121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/* $Id: osdep-netbsd.c,v 1.6 2009-07-28 22:28:11 tcunha Exp $ */
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/*
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* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define is_runnable(p) \
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((p)->p_stat == LSRUN || (p)->p_stat == SIDL)
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#define is_stopped(p) \
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((p)->p_stat == SSTOP || (p)->p_stat == SZOMB)
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char *osdep_get_name(int, char *);
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char *
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osdep_get_name(int fd, __unused char *tty)
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{
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int mib[6];
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struct stat sb;
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size_t len, i;
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struct kinfo_proc2 *buf, *newbuf, *p, *bestp;
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char *name;
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if (stat(tty, &sb) == -1)
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return (NULL);
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if ((mib[3] = tcgetpgrp(fd)) == -1)
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return (NULL);
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buf = NULL;
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len = sizeof(p);
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC2;
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mib[2] = KERN_PROC_PGRP;
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mib[4] = sizeof (*buf);
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mib[5] = 0;
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retry:
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if (sysctl(mib, __arraycount(mib), NULL, &len, NULL, 0) == -1)
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return (NULL);
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if ((newbuf = realloc(buf, len * sizeof (*buf))) == NULL) {
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free(buf);
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return (NULL);
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}
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buf = newbuf;
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mib[5] = len / sizeof(*buf);
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if (sysctl(mib, __arraycount(mib), buf, &len, NULL, 0) == -1) {
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if (errno == ENOMEM)
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goto retry; /* possible infinite loop? */
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free(buf);
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return (NULL);
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}
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bestp = NULL;
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for (i = 0; i < len / sizeof (*buf); i++) {
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if (buf[i].p_tdev != sb.st_rdev)
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continue;
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p = &buf[i];
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if (bestp == NULL) {
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bestp = p;
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continue;
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}
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if (is_runnable(p) && !is_runnable(bestp)) {
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bestp = p;
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continue;
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} else if (!is_runnable(p) && is_runnable(bestp))
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continue;
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if (!is_stopped(p) && is_stopped(bestp)) {
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bestp = p;
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continue;
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} else if (is_stopped(p) && !is_stopped(bestp))
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continue;
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if (p->p_estcpu > bestp->p_estcpu) {
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bestp = p;
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continue;
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} else if (p->p_estcpu < bestp->p_estcpu)
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continue;
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if (p->p_slptime < bestp->p_slptime) {
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bestp = p;
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continue;
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} else if (p->p_slptime > bestp->p_slptime)
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continue;
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if (p->p_pid > bestp->p_pid)
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bestp = p;
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}
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name = NULL;
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if (bestp != NULL)
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name = strdup(bestp->p_comm);
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free(buf);
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return (name);
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}
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