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/* $OpenBSD: procname.c,v 1.2 2009/06/26 10:55:37 nicm Exp $ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/stat.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 == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC)
#define is_stopped(p) \
((p)->p_stat == SSTOP || (p)->p_stat == SZOMB || (p)->p_stat == SDEAD)
char *get_proc_name(int, char *);
char *
get_proc_name(int fd, char *tty)
{
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
struct stat sb;
size_t len;
struct kinfo_proc *buf, *newbuf;
struct proc *p, *bestp;
u_int i;
char *name;
buf = NULL;
if (stat(tty, &sb) == -1)
return (NULL);
if ((mib[3] = tcgetpgrp(fd)) == -1)
return (NULL);
retry:
if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
return (NULL);
len = (len * 5) / 4;
if ((newbuf = realloc(buf, len)) == NULL) {
free(buf);
return (NULL);
}
buf = newbuf;
if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
if (errno == ENOMEM)
goto retry;
free(buf);
return (NULL);
}
bestp = NULL;
for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
if (buf[i].kp_eproc.e_tdev != sb.st_rdev)
continue;
p = &buf[i].kp_proc;
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_flag & P_SINTR && !(bestp->p_flag & P_SINTR))
bestp = p;
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;
else if (LIST_FIRST(&p->p_children) != NULL &&
LIST_FIRST(&bestp->p_children) == NULL)
continue;
if (strcmp(p->p_comm, p->p_comm) < 0)
bestp = p;
else if (strcmp(p->p_comm, p->p_comm) > 0)
continue;
if (p->p_pid > bestp->p_pid)
bestp = p;
}
name = NULL;
if (bestp != NULL)
name = strdup(bestp->p_comm);
free(buf);
return (name);
}
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