compat/getdtablecount.c

   1 /*
   2  * Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  13  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  14  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <sys/types.h>
  18
  19 #include <glob.h>
  20 #include <unistd.h>
  21
  22 #include "compat.h"
  23
  24 void fatal(const char *, ...);
  25 void fatalx(const char *, ...);
  26
  27 #ifdef HAVE_PROC_PID
  28 int
  29 getdtablecount(void)
  30 {
  31         char    path[PATH_MAX];
  32         glob_t  g;
  33         int     n = 0;
  34
  35         if (snprintf(path, sizeof path, "/proc/%ld/fd/*", (long)getpid()) < 0)
  36                 fatal("snprintf overflow");
  37         if (glob(path, 0, NULL, &g) == 0)
  38                 n = g.gl_pathc;
  39         globfree(&g);
  40         return (n);
  41 }
  42 #else
  43 int
  44 getdtablecount(void)
  45 {
  46         return (0);
  47 }
  48 #endif