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; 34 35 if (snprintf(path, sizeof path, "/proc/%ld/fd/*", (long)getpid()) < 0) 36 fatal("snprintf overflow"); 37 switch (glob(path, 0, NULL, &g)) { 38 case GLOB_NOMATCH: 39 return (0); 40 case 0: 41 break; 42 default: 43 fatal("glob(\"%s\") failed", path); 44 } 45 n = g.gl_pathc; 46 globfree(&g); 47 return (n); 48 } 49 #else 50 int 51 getdtablecount(void) 52 { 53 return (0); 54 } 55 #endif 56