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140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/* $OpenBSD$ */
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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/sysctl.h>
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#include <sys/stat.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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#ifndef nitems
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#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
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#endif
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#define is_runnable(p) \
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((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC)
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#define is_stopped(p) \
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((p)->p_stat == SSTOP || (p)->p_stat == SZOMB || (p)->p_stat == SDEAD)
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char *get_proc_name(int, char *);
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char *
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get_proc_name(int fd, char *tty)
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{
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int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
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struct stat sb;
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size_t len;
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struct kinfo_proc *buf, *newbuf;
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struct proc *p, *bestp;
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u_int i;
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char *name;
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buf = NULL;
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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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retry:
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if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
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return (NULL);
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len = (len * 5) / 4;
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if ((newbuf = realloc(buf, len)) == 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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if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
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if (errno == ENOMEM)
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goto retry;
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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 (struct kinfo_proc); i++) {
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if (buf[i].kp_eproc.e_tdev != sb.st_rdev)
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continue;
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p = &buf[i].kp_proc;
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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_flag & P_SINTR && !(bestp->p_flag & P_SINTR)) {
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bestp = p;
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continue;
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} else if (!(p->p_flag & P_SINTR) && bestp->p_flag & P_SINTR)
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continue;
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if (LIST_FIRST(&p->p_children) == NULL &&
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LIST_FIRST(&bestp->p_children) != NULL) { /* XXX ugh */
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bestp = p;
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continue;
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} else if (LIST_FIRST(&p->p_children) != NULL &&
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LIST_FIRST(&bestp->p_children) == NULL)
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continue;
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if (strcmp(p->p_comm, bestp->p_comm) < 0) {
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bestp = p;
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continue;
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} else if (strcmp(p->p_comm, bestp->p_comm) > 0)
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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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