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/* $OpenBSD: procname.c,v 1.15 2016/01/19 15:59:12 nicm Exp $ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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> /* MAXCOMLEN */
#include <sys/types.h>
#include <sys/proc.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 == SDEAD)
struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
char *get_proc_name(int, char *);
struct kinfo_proc *
cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
{
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);
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 *
get_proc_name(int fd, char *tty)
{
int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
sizeof(struct kinfo_proc), 0 };
struct stat sb;
size_t len;
struct kinfo_proc *buf, *newbuf, *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)
goto error;
len = (len * 5) / 4;
if ((newbuf = realloc(buf, len)) == NULL)
goto error;
buf = newbuf;
mib[5] = (int)(len / sizeof(struct kinfo_proc));
if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
if (errno == ENOMEM)
goto retry;
goto error;
}
bestp = NULL;
for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
if ((dev_t)buf[i].p_tdev != sb.st_rdev)
continue;
if (bestp == NULL)
bestp = &buf[i];
else
bestp = cmp_procs(&buf[i], bestp);
}
name = NULL;
if (bestp != NULL)
name = strdup(bestp->p_comm);
free(buf);
return (name);
error:
free(buf);
return (NULL);
}
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