libexplain  1.4.D001
libexplain/iocontrol/vt_setmode.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2009-2011, 2013 Peter Miller
00004  *
00005  * This program is free software; you can redistribute it and/or modify it
00006  * under the terms of the GNU Lesser General Public License as published by
00007  * the Free Software Foundation; either version 3 of the License, or (at your
00008  * option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,but WITHOUT
00011  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
00013  * for more details.
00014  *
00015  * You should have received a copy of the GNU Lesser General Public License
00016  * along with this program. If not, see <http://www.gnu.org/licenses/>.
00017  */
00018 
00019 #include <libexplain/ac/sys/ioctl.h>
00020 #include <libexplain/ac/errno.h>
00021 #include <libexplain/ac/linux/vt.h>
00022 
00023 #include <libexplain/buffer/einval.h>
00024 #include <libexplain/buffer/eperm.h>
00025 #include <libexplain/buffer/vt_mode.h>
00026 #include <libexplain/capability.h>
00027 #include <libexplain/iocontrol/generic.h>
00028 #include <libexplain/iocontrol/vt_setmode.h>
00029 #include <libexplain/is_efault.h>
00030 
00031 #ifdef VT_SETMODE
00032 
00033 
00034 static void
00035 print_data(const explain_iocontrol_t *p, explain_string_buffer_t *sb, int
00036     errnum, int fildes, int request, const void *data)
00037 {
00038     (void)p;
00039     (void)errnum;
00040     (void)fildes;
00041     (void)request;
00042     explain_buffer_vt_mode(sb, data);
00043 }
00044 
00045 
00046 static void
00047 print_explanation(const explain_iocontrol_t *p, explain_string_buffer_t *sb, int
00048     errnum, int fildes, int request, const void *data)
00049 {
00050     switch (errnum)
00051     {
00052     case EPERM:
00053         if (!explain_capability_sys_tty_config())
00054         {
00055             explain_buffer_eperm_sys_tty_config(sb, "ioctl VT_SETMODE");
00056             break;
00057         }
00058         goto generic;
00059 
00060     case EINVAL:
00061         {
00062             const struct vt_mode *arg;
00063 
00064             arg = data;
00065             if (!explain_is_efault_pointer(arg, sizeof(*arg)))
00066             {
00067                 if (arg->mode != VT_AUTO && arg->mode != VT_PROCESS)
00068                 {
00069                     explain_buffer_einval_vague(sb, "data.mode");
00070                     break;
00071                 }
00072             }
00073         }
00074         goto generic;
00075 
00076     default:
00077         generic:
00078         explain_iocontrol_generic_print_explanation
00079         (
00080             p,
00081             sb,
00082             errnum,
00083             fildes,
00084             request,
00085             data
00086         );
00087         break;
00088     }
00089 }
00090 
00091 
00092 const explain_iocontrol_t explain_iocontrol_vt_setmode =
00093 {
00094     "VT_SETMODE", /* name */
00095     VT_SETMODE, /* value */
00096     0, /* disambiguate */
00097     0, /* print_name */
00098     print_data,
00099     print_explanation,
00100     0, /* print_data_returned */
00101     sizeof(struct vt_mode), /* data_size */
00102     "struct vt_mode *", /* data_type */
00103     IOCONTROL_FLAG_SIZE_DOES_NOT_AGREE, /* flags */
00104     __FILE__,
00105     __LINE__,
00106 };
00107 
00108 #else /* ndef VT_SETMODE */
00109 
00110 const explain_iocontrol_t explain_iocontrol_vt_setmode =
00111 {
00112     0, /* name */
00113     0, /* value */
00114     0, /* disambiguate */
00115     0, /* print_name */
00116     0, /* print_data */
00117     0, /* print_explanation */
00118     0, /* print_data_returned */
00119     0, /* data_size */
00120     0, /* data_type */
00121     0, /* flags */
00122     __FILE__,
00123     __LINE__,
00124 };
00125 
00126 #endif /* VT_SETMODE */
00127 
00128 
00129 /* vim: set ts=8 sw=4 et : */