libexplain  1.4.D001
libexplain/capability.c
Go to the documentation of this file.
00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2008, 2009, 2013 Peter Miller
00004  * Written by Peter Miller <pmiller@opensource.org.au>
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU Lesser General Public License as
00008  * published by the Free Software Foundation; either version 3 of the
00009  * License, or (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public License
00017  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
00018  */
00019 
00020 #include <libexplain/ac/sys/capability.h>
00021 #include <libexplain/ac/unistd.h>
00022 
00023 #include <libexplain/capability.h>
00024 
00025 
00026 int
00027 explain_capability(int cap)
00028 {
00029 #ifdef HAVE_CAP_GET_PROC
00030     cap_t           cap_p;
00031 
00032     cap_p = cap_get_proc();
00033     if (cap_p)
00034     {
00035         cap_flag_t           set;
00036         cap_flag_value_t     value;
00037         int                  result;
00038 
00039         set = CAP_EFFECTIVE;
00040         if (cap_get_flag(cap_p, cap, set, &value) < 0)
00041             value = CAP_CLEAR;
00042 
00043         /*
00044          * using a temp variable 'result' in case cap_flag_value_t is
00045          * implemented as a pointer that is invalid after cap_free()
00046          */
00047         result = (value != CAP_CLEAR);
00048 
00049         cap_free(cap_p);
00050         return result;
00051     }
00052 #else
00053     (void)cap;
00054 #endif
00055     return (geteuid() == 0);
00056 }
00057 
00058 
00059 /* vim: set ts=8 sw=4 et : */