external/bsd/tmux/dist/osdep-linux.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/types.h>
  20 #include <sys/stat.h>
  21
  22 #include <event.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26
  27 #include "tmux.h"
  28
  29 char *
  30 osdep_get_name(int fd, unused char *tty)
  31 {
  32         FILE    *f;
  33         char    *path, *buf;
  34         size_t   len;
  35         int      ch;
  36         pid_t    pgrp;
  37
  38         if ((pgrp = tcgetpgrp(fd)) == -1)
  39                 return (NULL);
  40
  41         xasprintf(&path, "/proc/%lld/cmdline", (long long) pgrp);
  42         if ((f = fopen(path, "r")) == NULL) {
  43                 free(path);
  44                 return (NULL);
  45         }
  46         free(path);
  47
  48         len = 0;
  49         buf = NULL;
  50         while ((ch = fgetc(f)) != EOF) {
  51                 if (ch == '\0')
  52                         break;
  53                 buf = xrealloc(buf, 1, len + 2);
  54                 buf[len++] = ch;
  55         }
  56         if (buf != NULL)
  57                 buf[len] = '\0';
  58
  59         fclose(f);
  60         return (buf);
  61 }
  62
  63 char *
  64 osdep_get_cwd(int fd)
  65 {
  66         static char      target[MAXPATHLEN + 1];
  67         char            *path;
  68         pid_t            pgrp;
  69         ssize_t          n;
  70
  71         if ((pgrp = tcgetpgrp(fd)) == -1)
  72                 return (NULL);
  73
  74         xasprintf(&path, "/proc/%lld/cwd", (long long) pgrp);
  75         n = readlink(path, target, MAXPATHLEN);
  76         free(path);
  77         if (n > 0) {
  78                 target[n] = '\0';
  79                 return (target);
  80         }
  81         return (NULL);
  82 }
  83
  84 struct event_base *
  85 osdep_event_init(void)
  86 {
  87         /* On Linux, epoll doesn't work on /dev/null (yes, really). */
  88         setenv("EVENT_NOEPOLL", "1", 1);
  89         return (event_init());
  90 }