libexplain  1.4.D001
libexplain/shmat_or_die.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 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, 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/ac/errno.h>
00020 #include <libexplain/ac/sys/shm.h>
00021 
00022 #include <libexplain/output.h>
00023 #include <libexplain/shmat.h>
00024 
00025 
00026 #ifndef HAVE_SHMAT
00027 
00028 static void *
00029 shmat(int shmid, const void *shmaddr, int shmflg)
00030 {
00031     (void)shmid;
00032     (void)shmaddr;
00033     (void)shmflg;
00034     errno = ENOSYS;
00035     return NULL;
00036 }
00037 
00038 #endif
00039 
00040 
00041 void *
00042 explain_shmat_or_die(int shmid, const void *shmaddr, int shmflg)
00043 {
00044     void            *result;
00045 
00046     result = explain_shmat_on_error(shmid, shmaddr, shmflg);
00047     if (!result || result == (void *)(-1))
00048     {
00049         explain_output_exit_failure();
00050     }
00051     return result;
00052 }
00053 
00054 
00055 void *
00056 explain_shmat_on_error(int shmid, const void *shmaddr, int shmflg)
00057 {
00058     void            *result;
00059 
00060     result = shmat(shmid, shmaddr, shmflg);
00061     if (!result || result == (void *)(-1))
00062     {
00063         int             hold_errno;
00064 
00065         hold_errno = errno;
00066         explain_output_error
00067         (
00068             "%s",
00069             explain_errno_shmat(hold_errno, shmid, shmaddr, shmflg)
00070         );
00071         errno = hold_errno;
00072     }
00073     return result;
00074 }
00075 
00076 
00077 /* vim: set ts=8 sw=4 et : */