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/* $OpenBSD$ */
/*
* 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>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <err.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libutil.h>
#include "compat.h"
struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
char *osdep_get_name(int, char *);
char *osdep_get_cwd(int);
struct event_base *osdep_event_init(void);
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif
#define is_runnable(p) \
((p)->ki_stat == SRUN || (p)->ki_stat == SIDL)
#define is_stopped(p) \
((p)->ki_stat == SSTOP || (p)->ki_stat == SZOMB)
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->ki_estcpu > p2->ki_estcpu)
return (p1);
if (p1->ki_estcpu < p2->ki_estcpu)
return (p2);
if (p1->ki_slptime < p2->ki_slptime)
return (p1);
if (p1->ki_slptime > p2->ki_slptime)
return (p2);
if (strcmp(p1->ki_comm, p2->ki_comm) < 0)
return (p1);
if (strcmp(p1->ki_comm, p2->ki_comm) > 0)
return (p2);
if (p1->ki_pid > p2->ki_pid)
return (p1);
return (p2);
}
char *
osdep_get_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, *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)
goto error;
buf = newbuf;
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 (buf[i].ki_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->ki_comm);
free(buf);
return (name);
error:
free(buf);
return (NULL);
}
static char *
osdep_get_cwd_fallback(int fd)
{
static char wd[PATH_MAX];
struct kinfo_file *info = NULL;
pid_t pgrp;
int nrecords, i;
if ((pgrp = tcgetpgrp(fd)) == -1)
return (NULL);
if ((info = kinfo_getfile(pgrp, &nrecords)) == NULL)
return (NULL);
for (i = 0; i < nrecords; i++) {
if (info[i].kf_fd == KF_FD_TYPE_CWD) {
strlcpy(wd, info[i].kf_path, sizeof wd);
free(info);
return (wd);
}
}
free(info);
return (NULL);
}
#ifdef KERN_PROC_CWD
char *
osdep_get_cwd(int fd)
{
static struct kinfo_file info;
static int fallback;
int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_CWD, 0 };
size_t len = sizeof info;
if (fallback)
return (osdep_get_cwd_fallback(fd));
if ((name[3] = tcgetpgrp(fd)) == -1)
return (NULL);
if (sysctl(name, 4, &info, &len, NULL, 0) == -1) {
if (errno == ENOENT) {
fallback = 1;
return (osdep_get_cwd_fallback(fd));
}
return (NULL);
}
return (info.kf_path);
}
#else /* !KERN_PROC_CWD */
char *
osdep_get_cwd(int fd)
{
return (osdep_get_cwd_fallback(fd));
}
#endif /* KERN_PROC_CWD */
struct event_base *
osdep_event_init(void)
{
struct event_base *base;
/*
* On some versions of FreeBSD, kqueue doesn't work properly on tty
* file descriptors. This is fixed in recent FreeBSD versions.
*/
setenv("EVENT_NOKQUEUE", "1", 1);
base = event_init();
unsetenv("EVENT_NOKQUEUE");
return (base);
}
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