osdep-dragonfly.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/param.h>
  20 #include <sys/stat.h>
  21 #include <sys/sysctl.h>
  22 #include <sys/user.h>
  23
  24 #include <err.h>
  25 #include <errno.h>
  26 #include <stdint.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 struct kinfo_proc       *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
  32 char                    *osdep_get_name(int, char *);
  33 char                    *osdep_get_cwd(int);
  34 struct event_base       *osdep_event_init(void);
  35
  36 #ifndef nitems
  37 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
  38 #endif
  39
  40 #define is_runnable(p) \
  41         ((p)->kp_stat == SACTIVE || (p)->kp_stat == SIDL)
  42 #define is_stopped(p) \
  43         ((p)->kp_stat == SSTOP || (p)->kp_stat == SZOMB)
  44
  45 struct kinfo_proc *
  46 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
  47 {
  48         if (is_runnable(p1) && !is_runnable(p2))
  49                 return (p1);
  50         if (!is_runnable(p1) && is_runnable(p2))
  51                 return (p2);
  52
  53         if (is_stopped(p1) && !is_stopped(p2))
  54                 return (p1);
  55         if (!is_stopped(p1) && is_stopped(p2))
  56                 return (p2);
  57
  58         if (strcmp(p1->kp_comm, p2->kp_comm) < 0)
  59                 return (p1);
  60         if (strcmp(p1->kp_comm, p2->kp_comm) > 0)
  61                 return (p2);
  62
  63         if (p1->kp_pid > p2->kp_pid)
  64                 return (p1);
  65         return (p2);
  66 }
  67
  68 char *
  69 osdep_get_name(int fd, char *tty)
  70 {
  71         int              mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
  72         struct stat      sb;
  73         size_t           len;
  74         struct kinfo_proc *buf, *newbuf, *bestp;
  75         u_int            i;
  76         char            *name;
  77
  78         buf = NULL;
  79
  80         if (stat(tty, &sb) == -1)
  81                 return (NULL);
  82         if ((mib[3] = tcgetpgrp(fd)) == -1)
  83                 return (NULL);
  84
  85 retry:
  86         if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
  87                 return (NULL);
  88         len = (len * 5) / 4;
  89
  90         if ((newbuf = realloc(buf, len)) == NULL)
  91                 goto error;
  92         buf = newbuf;
  93
  94         if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
  95                 if (errno == ENOMEM)
  96                         goto retry;
  97                 goto error;
  98         }
  99
 100         bestp = NULL;
 101         for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
 102                 if (buf[i].kp_tdev != sb.st_rdev)
 103                         continue;
 104                 if (bestp == NULL)
 105                         bestp = &buf[i];
 106                 else
 107                         bestp = cmp_procs(&buf[i], bestp);
 108         }
 109
 110         name = NULL;
 111         if (bestp != NULL)
 112                 name = strdup(bestp->kp_comm);
 113
 114         free(buf);
 115         return (name);
 116
 117 error:
 118         free(buf);
 119         return (NULL);
 120 }
 121
 122 char *
 123 osdep_get_cwd(int fd)
 124 {
 125         return (NULL);
 126 }
 127
 128 struct event_base *
 129 osdep_event_init(void)
 130 {
 131         return (event_init());
 132 }