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/* $Id: osdep-openbsd.c,v 1.4 2009-01-27 19:44:10 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.
*/
#ifdef __OpenBSD__
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
char *get_argv0(int, char *);
char *get_proc_argv0(pid_t);
char *
get_argv0(__attribute__ ((unused)) int fd, char *tty)
{
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_TTY, 0 };
struct stat sb;
size_t len;
struct kinfo_proc *buf, *newbuf;
struct proc *p, *bestp;
char *procname;
u_int i;
buf = NULL;
if (stat(tty, &sb) == -1)
return (NULL);
mib[3] = sb.st_rdev;
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++) {
p = &buf[i].kp_proc;
if (bestp == NULL)
bestp = p;
if (p->p_stat != SRUN &&
p->p_stat != SIDL &&
p->p_stat != SONPROC)
continue;
if (p->p_estcpu < bestp->p_estcpu)
continue;
if (p->p_slptime > bestp->p_slptime)
continue;
bestp = p;
}
procname = get_proc_argv0(bestp->p_pid);
if (procname == NULL || *procname == '\0') {
free(procname);
procname = strdup(bestp->p_comm);
}
free(buf);
return (procname);
}
char *
get_proc_argv0(pid_t pid)
{
int mib[4] = { CTL_KERN, KERN_PROC_ARGS, 0, KERN_PROC_ARGV };
size_t size;
char **args, **args2, *procname;
procname = NULL;
mib[2] = pid;
args = NULL;
size = 128;
while (size < SIZE_MAX / 2) {
size *= 2;
if ((args2 = realloc(args, size)) == NULL)
break;
args = args2;
if (sysctl(mib, 4, args, &size, NULL, 0) == -1) {
if (errno == ENOMEM)
continue;
break;
}
procname = strdup(*args);
break;
}
free(args);
return (procname);
}
#endif
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