libexplain  1.4.D001
libexplain/iocontrol/tiocinq.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2009-2011, 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 it
00007  * under the terms of the GNU Lesser General Public License as published by
00008  * the Free Software Foundation; either version 3 of the License, or (at your
00009  * option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful, but WITHOUT
00012  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00013  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00014  * 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/ioctl.h>
00021 #include <libexplain/ac/sys/stat.h>
00022 
00023 #include <libexplain/iocontrol/generic.h>
00024 #include <libexplain/iocontrol/tiocinq.h>
00025 
00026 #ifdef TIOCINQ
00027 
00028 
00029 static int
00030 disambiguate(int fildes, int request, const void *data)
00031 {
00032     struct stat     st;
00033 
00034     /* success = 0, failure = -1 */
00035     (void)request;
00036     (void)data;
00037     if (fstat(fildes, &st) >= 0 && S_ISCHR(st.st_mode))
00038         return 0;
00039     return -1;
00040 }
00041 
00042 
00043 /*
00044  * We have conflicts...
00045  * SIOCINQ - sockets only
00046  * TIOCINQ - terminals only
00047  * FIONREAD - everything else
00048  */
00049 const explain_iocontrol_t explain_iocontrol_tiocinq =
00050 {
00051     "TIOCINQ", /* name */
00052     TIOCINQ, /* value */
00053     disambiguate,
00054     0, /* print_name */
00055     explain_iocontrol_generic_print_data_pointer, /* print_data */
00056     0, /* print_explanation */
00057     explain_iocontrol_generic_print_data_int_star, /* print_data_returned */
00058     sizeof(int), /* data_size */
00059     "int *", /* data_type */
00060     IOCONTROL_FLAG_SIZE_DOES_NOT_AGREE, /* flags */
00061     __FILE__,
00062     __LINE__,
00063 };
00064 
00065 #else
00066 
00067 const explain_iocontrol_t explain_iocontrol_tiocinq =
00068 {
00069     0, /* name */
00070     0, /* value */
00071     0, /* disambiguate */
00072     0, /* print_name */
00073     0, /* print_data */
00074     0, /* print_explanation */
00075     0, /* print_data_returned */
00076     0, /* data_size */
00077     0, /* data_type */
00078     0, /* flags */
00079     __FILE__,
00080     __LINE__,
00081 };
00082 
00083 #endif
00084 
00085 
00086 /* vim: set ts=8 sw=4 et : */