libexplain  1.4.D001
libexplain/buffer/errno/setreuid.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2012, 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, but
00011  * WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
00013  * 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/buffer/errno/setresuid.h>
00020 #include <libexplain/buffer/errno/setreuid.h>
00021 #include <libexplain/buffer/uid.h>
00022 #include <libexplain/explanation.h>
00023 
00024 
00025 static void
00026 explain_buffer_errno_setreuid_system_call(explain_string_buffer_t *sb, int
00027     errnum, uid_t ruid, uid_t euid)
00028 {
00029     (void)errnum;
00030     explain_string_buffer_puts(sb, "setreuid(ruid = ");
00031     explain_buffer_uid(sb, ruid);
00032     explain_string_buffer_puts(sb, ", euid = ");
00033     explain_buffer_uid(sb, euid);
00034     explain_string_buffer_putc(sb, ')');
00035 }
00036 
00037 
00038 void
00039 explain_buffer_errno_setreuid_explanation(explain_string_buffer_t *sb,
00040     int errnum, const char *syscall_name, uid_t ruid, uid_t euid)
00041 {
00042     /*
00043      * Note that this isn't strictly correct.  On Linux, at least, the
00044      * two functions are actually asymmetric, with setresuid permitting
00045      * things that setreuid does not.
00046      */
00047     explain_buffer_errno_setresuid_explanation(sb, errnum, syscall_name, ruid,
00048         euid, -1);
00049 }
00050 
00051 
00052 void
00053 explain_buffer_errno_setreuid(explain_string_buffer_t *sb, int errnum,
00054     uid_t ruid, uid_t euid)
00055 {
00056     explain_explanation_t exp;
00057 
00058     explain_explanation_init(&exp, errnum);
00059     explain_buffer_errno_setreuid_system_call(&exp.system_call_sb, errnum, ruid,
00060         euid);
00061     explain_buffer_errno_setreuid_explanation(&exp.explanation_sb, errnum,
00062         "setreuid", ruid, euid);
00063     explain_explanation_assemble(&exp, sb);
00064 }
00065 
00066 
00067 /* vim: set ts=8 sw=4 et : */