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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 <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
#define is_runnable(p) \
((p)->p_stat == LSRUN || (p)->p_stat == SIDL)
#define is_stopped(p) \
((p)->p_stat == SSTOP || (p)->p_stat == SZOMB)
struct kinfo_proc2 *cmp_procs(struct kinfo_proc2 *, struct kinfo_proc2 *);
char *osdep_get_name(int, char *);
char *osdep_get_cwd(int);
struct event_base *osdep_event_init(void);
struct kinfo_proc2 *
cmp_procs(struct kinfo_proc2 *p1, struct kinfo_proc2 *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_pid > p2->p_pid)
return (p1);
return (p2);
}
char *
osdep_get_name(int fd, __unused char *tty)
{
int mib[6];
struct stat sb;
size_t len, i;
struct kinfo_proc2 *buf, *newbuf, *bestp;
char *name;
if (stat(tty, &sb) == -1)
return (NULL);
if ((mib[3] = tcgetpgrp(fd)) == -1)
return (NULL);
buf = NULL;
len = sizeof bestp;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC2;
mib[2] = KERN_PROC_PGRP;
mib[4] = sizeof *buf;
retry:
mib[5] = 0;
if (sysctl(mib, __arraycount(mib), NULL, &len, NULL, 0) == -1)
return (NULL);
if ((newbuf = realloc(buf, len)) == NULL)
goto error;
buf = newbuf;
mib[5] = len / (sizeof *buf);
if (sysctl(mib, __arraycount(mib), buf, &len, NULL, 0) == -1) {
if (errno == ENOMEM)
goto retry;
goto error;
}
bestp = NULL;
for (i = 0; i < len / (sizeof *buf); i++) {
if (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);
}
char *
osdep_get_cwd(int fd)
{
static char target[PATH_MAX + 1];
pid_t pgrp;
#ifdef KERN_PROC_CWD
int mib[4];
size_t len;
#else
char *path;
ssize_t n;
#endif
if ((pgrp = tcgetpgrp(fd)) == -1)
return (NULL);
#ifdef KERN_PROC_CWD
mib[0] = CTL_KERN;
mib[1] = KERN_PROC_ARGS;
mib[2] = pgrp;
mib[3] = KERN_PROC_CWD;
len = sizeof(target);
if (sysctl(mib, __arraycount(mib), target, &len, NULL, 0) == 0)
return (target);
#else
xasprintf(&path, "/proc/%lld/cwd", (long long) pgrp);
n = readlink(path, target, sizeof(target) - 1);
free(path);
if (n > 0) {
target[n] = '\0';
return (target);
}
#endif
return (NULL);
}
struct event_base *
osdep_event_init(void)
{
return (event_init());
}
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