libexplain  1.4.D001
libexplain/buffer/errno/getpeername.c
Go to the documentation of this file.
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
00008  * your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Lesser General Public License 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/errno.h>
00020 
00021 #include <libexplain/buffer/ebadf.h>
00022 #include <libexplain/buffer/efault.h>
00023 #include <libexplain/buffer/einval.h>
00024 #include <libexplain/buffer/enobufs.h>
00025 #include <libexplain/buffer/enotconn.h>
00026 #include <libexplain/buffer/enotsock.h>
00027 #include <libexplain/buffer/errno/generic.h>
00028 #include <libexplain/buffer/errno/getpeername.h>
00029 #include <libexplain/buffer/fildes_to_pathname.h>
00030 #include <libexplain/buffer/gettext.h>
00031 #include <libexplain/buffer/pointer.h>
00032 #include <libexplain/buffer/socklen.h>
00033 #include <libexplain/explanation.h>
00034 #include <libexplain/is_efault.h>
00035 
00036 
00037 static void
00038 explain_buffer_errno_getpeername_system_call(explain_string_buffer_t *sb,
00039     int errnum, int fildes, struct sockaddr *sock_addr,
00040     socklen_t *sock_addr_size)
00041 {
00042     (void)errnum;
00043     explain_string_buffer_printf(sb, "getpeername(fildes = %d", fildes);
00044     explain_buffer_fildes_to_pathname(sb, fildes);
00045     explain_string_buffer_puts(sb, ", sock_addr = ");
00046     explain_buffer_pointer(sb, sock_addr);
00047     explain_string_buffer_puts(sb, ", sock_addr_size = ");
00048     explain_buffer_socklen_star(sb, sock_addr_size);
00049     explain_string_buffer_putc(sb, ')');
00050 }
00051 
00052 
00053 static void
00054 explain_buffer_errno_getpeername_explanation(explain_string_buffer_t *sb,
00055     int errnum, int fildes, struct sockaddr *sock_addr,
00056     socklen_t *sock_addr_size)
00057 {
00058     /*
00059      * http://www.opengroup.org/onlinepubs/009695399/functions/getpeername.html
00060      */
00061     switch (errnum)
00062     {
00063     case EBADF:
00064         explain_buffer_ebadf(sb, fildes, "fildes");
00065         break;
00066 
00067     case EFAULT:
00068         if
00069         (
00070             explain_is_efault_pointer
00071             (
00072                 sock_addr_size,
00073                 sizeof(*sock_addr_size)
00074             )
00075         )
00076         {
00077             explain_buffer_efault(sb, "sock_addr_size");
00078             break;
00079         }
00080         if
00081         (
00082             (int)*sock_addr_size > 0
00083         &&
00084             explain_is_efault_pointer(sock_addr, *sock_addr_size)
00085         )
00086         {
00087             explain_buffer_efault(sb, "sock_addr");
00088             break;
00089         }
00090         goto dunno;
00091 
00092     case EINVAL:
00093         if
00094         (
00095             explain_is_efault_pointer
00096             (
00097                 sock_addr_size,
00098                 sizeof(*sock_addr_size)
00099             )
00100         )
00101             goto dunno;
00102         explain_buffer_einval_too_small
00103         (
00104             sb,
00105             "sock_addr_size",
00106             (int)*sock_addr_size
00107         );
00108         break;
00109 
00110     case ENOBUFS:
00111         explain_buffer_enobufs(sb);
00112         break;
00113 
00114     case ENOTCONN:
00115         explain_buffer_enotconn(sb, "fildes");
00116         break;
00117 
00118     case ENOTSOCK:
00119         explain_buffer_enotsock(sb, fildes, "fildes");
00120         break;
00121 
00122     default:
00123         dunno:
00124         explain_buffer_errno_generic(sb, errnum, "getpeername");
00125         break;
00126     }
00127 }
00128 
00129 
00130 void
00131 explain_buffer_errno_getpeername(explain_string_buffer_t *sb, int errnum,
00132     int fildes, struct sockaddr *sock_addr, socklen_t *sock_addr_size)
00133 {
00134     explain_explanation_t exp;
00135 
00136     explain_explanation_init(&exp, errnum);
00137     explain_buffer_errno_getpeername_system_call
00138     (
00139         &exp.system_call_sb,
00140         errnum,
00141         fildes,
00142         sock_addr,
00143         sock_addr_size
00144     );
00145     explain_buffer_errno_getpeername_explanation
00146     (
00147         &exp.explanation_sb,
00148         errnum,
00149         fildes,
00150         sock_addr,
00151         sock_addr_size
00152     );
00153     explain_explanation_assemble(&exp, sb);
00154 }
00155 
00156 /* vim: set ts=8 sw=4 et : */