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141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/* $Id: osdep-freebsd.c,v 1.8 2009-02-07 19:33:07 nicm Exp $ */
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/*
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* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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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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#ifdef __FreeBSD__
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <err.h>
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#include <errno.h>
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#include <stdint.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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char *get_argv0(int, char *);
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char *get_proc_argv0(pid_t);
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#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
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#define is_runnable(p) \
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((p)->ki_stat == SRUN || (p)->ki_stat == SIDL)
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#define is_stopped(p) \
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((p)->ki_stat == SSTOP || (p)->ki_stat == SZOMB)
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char *
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get_argv0(__attribute__ ((unused)) int fd, char *tty)
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{
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int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_TTY, 0 };
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struct stat sb;
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size_t len;
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struct kinfo_proc *buf, *newbuf, *p, *bestp;
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char *procname;
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u_int i;
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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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mib[3] = sb.st_rdev;
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retry:
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if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
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return (NULL);
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len = (len * 5) / 4;
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if ((newbuf = realloc(buf, len)) == NULL) {
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free(buf);
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return (NULL);
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}
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buf = newbuf;
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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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free(buf);
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return (NULL);
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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 (buf[i].ki_tdev != sb.st_rdev)
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continue;
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p = &buf[i];
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if (bestp == NULL)
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bestp = p;
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if (is_runnable(p) && !is_runnable(bestp))
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bestp = p;
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if (!is_stopped(p) && is_stopped(bestp))
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bestp = p;
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if (p->ki_estcpu > bestp->ki_estcpu)
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bestp = p;
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if (p->ki_slptime < bestp->ki_slptime)
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bestp = p;
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/* XXX children? */
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}
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if (bestp != NULL) {
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procname = get_proc_argv0(bestp->ki_pid);
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if (procname == NULL || *procname == '\0') {
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free(procname);
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procname = strdup(bestp->ki_comm);
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}
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} else
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procname = NULL;
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free(buf);
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return (procname);
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}
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char *
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get_proc_argv0(pid_t pid)
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{
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int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_ARGS, 0 };
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size_t size;
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char *args, *args2, *procname;
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mib[3] = pid;
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procname = NULL;
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args = NULL;
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size = 128;
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while (size < SIZE_MAX / 2) {
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size *= 2;
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if ((args2 = realloc(args, size)) == NULL)
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break;
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args = args2;
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if (sysctl(mib, 4, args, &size, NULL, 0) == -1) {
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if (errno == ENOMEM)
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continue;
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break;
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}
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procname = strdup(args);
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break;
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}
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free(args);
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return (procname);
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}
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#endif
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