external/bsd/tmux/dist/osdep-dragonfly.c

   1 /* Id */
   2
   3 /*
   4  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
   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 <event.h>
  27 #include <stdint.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31
  32 struct kinfo_proc       *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
  33 char                    *osdep_get_name(int, char *);
  34 char                    *osdep_get_cwd(int);
  35 struct event_base       *osdep_event_init(void);
  36
  37 #ifndef nitems
  38 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
  39 #endif
  40
  41 #define is_runnable(p) \
  42         ((p)->kp_stat == SACTIVE || (p)->kp_stat == SIDL)
  43 #define is_stopped(p) \
  44         ((p)->kp_stat == SSTOP || (p)->kp_stat == SZOMB)
  45
  46 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 (strcmp(p1->kp_comm, p2->kp_comm) < 0)
  60                 return (p1);
  61         if (strcmp(p1->kp_comm, p2->kp_comm) > 0)
  62                 return (p2);
  63
  64         if (p1->kp_pid > p2->kp_pid)
  65                 return (p1);
  66         return (p2);
  67 }
  68
  69 char *
  70 osdep_get_name(int fd, char *tty)
  71 {
  72         int              mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
  73         struct stat      sb;
  74         size_t           len;
  75         struct kinfo_proc *buf, *newbuf, *bestp;
  76         u_int            i;
  77         char            *name;
  78
  79         buf = NULL;
  80
  81         if (stat(tty, &sb) == -1)
  82                 return (NULL);
  83         if ((mib[3] = tcgetpgrp(fd)) == -1)
  84                 return (NULL);
  85
  86 retry:
  87         if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
  88                 return (NULL);
  89         len = (len * 5) / 4;
  90
  91         if ((newbuf = realloc(buf, len)) == NULL)
  92                 goto error;
  93         buf = newbuf;
  94
  95         if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
  96                 if (errno == ENOMEM)
  97                         goto retry;
  98                 goto error;
  99         }
 100
 101         bestp = NULL;
 102         for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
 103                 if (buf[i].kp_tdev != sb.st_rdev)
 104                         continue;
 105                 if (bestp == NULL)
 106                         bestp = &buf[i];
 107                 else
 108                         bestp = cmp_procs(&buf[i], bestp);
 109         }
 110
 111         name = NULL;
 112         if (bestp != NULL)
 113                 name = strdup(bestp->kp_comm);
 114
 115         free(buf);
 116         return (name);
 117
 118 error:
 119         free(buf);
 120         return (NULL);
 121 }
 122
 123 char *
 124 osdep_get_cwd(int fd)
 125 {
 126         return (NULL);
 127 }
 128
 129 struct event_base *
 130 osdep_event_init(void)
 131 {
 132         return (event_init());
 133 }