osdep-openbsd.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  15  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  16  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <sys/types.h>
  20 #include <sys/signal.h>
  21 #include <sys/proc.h>
  22 #include <sys/sysctl.h>
  23 #include <sys/stat.h>
  24
  25 #include <errno.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29
  30 #include "compat.h"
  31
  32 #ifndef nitems
  33 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
  34 #endif
  35
  36 #define is_runnable(p) \
  37         ((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC)
  38 #define is_stopped(p) \
  39         ((p)->p_stat == SSTOP || (p)->p_stat == SDEAD)
  40
  41 static struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
  42 char                     *osdep_get_name(int, char *);
  43 char                     *osdep_get_cwd(int);
  44 struct event_base        *osdep_event_init(void);
  45
  46 static struct kinfo_proc *
  47 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
  48 {
  49         if (is_runnable(p1) && !is_runnable(p2))
  50                 return (p1);
  51         if (!is_runnable(p1) && is_runnable(p2))
  52                 return (p2);
  53
  54         if (is_stopped(p1) && !is_stopped(p2))
  55                 return (p1);
  56         if (!is_stopped(p1) && is_stopped(p2))
  57                 return (p2);
  58
  59         if (p1->p_estcpu > p2->p_estcpu)
  60                 return (p1);
  61         if (p1->p_estcpu < p2->p_estcpu)
  62                 return (p2);
  63
  64         if (p1->p_slptime < p2->p_slptime)
  65                 return (p1);
  66         if (p1->p_slptime > p2->p_slptime)
  67                 return (p2);
  68
  69         if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
  70                 return (p1);
  71         if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
  72                 return (p2);
  73
  74         if (strcmp(p1->p_comm, p2->p_comm) < 0)
  75                 return (p1);
  76         if (strcmp(p1->p_comm, p2->p_comm) > 0)
  77                 return (p2);
  78
  79         if (p1->p_pid > p2->p_pid)
  80                 return (p1);
  81         return (p2);
  82 }
  83
  84 char *
  85 osdep_get_name(int fd, char *tty)
  86 {
  87         int              mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
  88                                     sizeof(struct kinfo_proc), 0 };
  89         struct stat      sb;
  90         size_t           len;
  91         struct kinfo_proc *buf, *newbuf, *bestp;
  92         u_int            i;
  93         char            *name;
  94
  95         buf = NULL;
  96
  97         if (stat(tty, &sb) == -1)
  98                 return (NULL);
  99         if ((mib[3] = tcgetpgrp(fd)) == -1)
 100                 return (NULL);
 101
 102 retry:
 103         if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
 104                 goto error;
 105         len = (len * 5) / 4;
 106
 107         if ((newbuf = realloc(buf, len)) == NULL)
 108                 goto error;
 109         buf = newbuf;
 110
 111         mib[5] = (int)(len / sizeof(struct kinfo_proc));
 112         if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
 113                 if (errno == ENOMEM)
 114                         goto retry;
 115                 goto error;
 116         }
 117
 118         bestp = NULL;
 119         for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
 120                 if ((dev_t)buf[i].p_tdev != sb.st_rdev)
 121                         continue;
 122                 if (bestp == NULL)
 123                         bestp = &buf[i];
 124                 else
 125                         bestp = cmp_procs(&buf[i], bestp);
 126         }
 127
 128         name = NULL;
 129         if (bestp != NULL)
 130                 name = strdup(bestp->p_comm);
 131
 132         free(buf);
 133         return (name);
 134
 135 error:
 136         free(buf);
 137         return (NULL);
 138 }
 139
 140 char *
 141 osdep_get_cwd(int fd)
 142 {
 143         int             name[] = { CTL_KERN, KERN_PROC_CWD, 0 };
 144         static char     path[PATH_MAX];
 145         size_t          pathlen = sizeof path;
 146
 147         if ((name[2] = tcgetpgrp(fd)) == -1)
 148                 return (NULL);
 149         if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0)
 150                 return (NULL);
 151         return (path);
 152 }
 153
 154 struct event_base *
 155 osdep_event_init(void)
 156 {
 157         return (event_init());
 158 }