GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/tmux/procname.c Lines: 0 59 0.0 %
Date: 2016-12-06 Branches: 0 58 0.0 %

Line Branch Exec Source
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/* $OpenBSD: procname.c,v 1.15 2016/01/19 15:59:12 nicm Exp $ */
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/*
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 * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
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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>	/* MAXCOMLEN */
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#include <sys/types.h>
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#include <sys/proc.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 == SDEAD)
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struct kinfo_proc	*cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
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char			*get_proc_name(int, char *);
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struct kinfo_proc *
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cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
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{
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	if (is_runnable(p1) && !is_runnable(p2))
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		return (p1);
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	if (!is_runnable(p1) && is_runnable(p2))
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		return (p2);
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	if (is_stopped(p1) && !is_stopped(p2))
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		return (p1);
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	if (!is_stopped(p1) && is_stopped(p2))
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		return (p2);
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	if (p1->p_estcpu > p2->p_estcpu)
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		return (p1);
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	if (p1->p_estcpu < p2->p_estcpu)
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		return (p2);
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	if (p1->p_slptime < p2->p_slptime)
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		return (p1);
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	if (p1->p_slptime > p2->p_slptime)
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		return (p2);
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	if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
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		return (p1);
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	if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
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		return (p2);
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	if (strcmp(p1->p_comm, p2->p_comm) < 0)
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		return (p1);
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	if (strcmp(p1->p_comm, p2->p_comm) > 0)
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		return (p2);
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	if (p1->p_pid > p2->p_pid)
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		return (p1);
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	return (p2);
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}
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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[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
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				    sizeof(struct kinfo_proc), 0 };
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	struct stat	 sb;
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	size_t		 len;
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	struct kinfo_proc *buf, *newbuf, *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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		goto error;
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	len = (len * 5) / 4;
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	if ((newbuf = realloc(buf, len)) == NULL)
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		goto error;
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	buf = newbuf;
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	mib[5] = (int)(len / sizeof(struct kinfo_proc));
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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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		goto error;
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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 ((dev_t)buf[i].p_tdev != sb.st_rdev)
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			continue;
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		if (bestp == NULL)
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			bestp = &buf[i];
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		else
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			bestp = cmp_procs(&buf[i], bestp);
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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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error:
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	free(buf);
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	return (NULL);
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}