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776eef49d8
possible. Annotate <sys/param.h> lines with their current reasons. Switch to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc. Change MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where sensible to avoid pulling in the pollution. These are the files confirmed through binary verification. ok guenther, millert, doug (helped with the verification protocol)
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/* $OpenBSD$ */
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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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#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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}
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