libexplain  1.4.D001
libexplain/utimensat_or_die.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/ac/errno.h>
00020 #include <libexplain/ac/sys/stat.h>
00021 
00022 #include <libexplain/option.h>
00023 #include <libexplain/output.h>
00024 #include <libexplain/utimensat.h>
00025 
00026 
00027 void
00028 explain_utimensat_or_die(int fildes, const char *pathname,
00029     const struct timespec *data, int flags)
00030 {
00031     if (explain_utimensat_on_error(fildes, pathname, data, flags) < 0)
00032     {
00033         explain_output_exit_failure();
00034     }
00035 }
00036 
00037 
00038 #ifndef HAVE_UTIMENSAT
00039 
00040 static int
00041 utimensat(int fildes, const char *pathname, const struct timespec *data,
00042     int flags)
00043 {
00044     (void)fildes;
00045     (void)pathname;
00046     (void)data;
00047     (void)flags;
00048     errno = ENOSYS;
00049     return -1;
00050 }
00051 
00052 #endif
00053 
00054 
00055 int
00056 explain_utimensat_on_error(int fildes, const char *pathname, const struct
00057     timespec *data, int flags)
00058 {
00059     int             result;
00060 
00061     result = utimensat(fildes, pathname, data, flags);
00062 
00063 #ifdef __linux__
00064     /*
00065      * Work around a kernel bug:
00066      * http://bugzilla.redhat.com/442352
00067      * http://bugzilla.redhat.com/449910
00068      * It appears that utimensat can mistakenly return 280 rather
00069      * than -1 upon ENOSYS failure.
00070      */
00071     if (result > 0 && errno == ENOSYS)
00072         result = -1;
00073 #endif
00074 
00075     if (result < 0)
00076     {
00077         int             hold_errno;
00078 
00079         hold_errno = errno;
00080         explain_output_message(explain_errno_utimensat(hold_errno, fildes,
00081             pathname, data, flags));
00082         errno = hold_errno;
00083     }
00084     return result;
00085 }
00086 
00087 
00088 /* vim: set ts=8 sw=4 et : */