libexplain  1.4.D001
libexplain/setsid_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/unistd.h>
00021 
00022 #include <libexplain/output.h>
00023 #include <libexplain/setsid.h>
00024 
00025 
00026 #ifndef HAVE_SETSID
00027 
00028 static int
00029 setsid(void)
00030 {
00031     errno = ENOSYS;
00032     return -1;
00033 }
00034 
00035 #endif
00036 
00037 
00038 pid_t
00039 explain_setsid_or_die(void)
00040 {
00041     pid_t           result;
00042 
00043     result = explain_setsid_on_error();
00044     if (result < 0)
00045     {
00046         explain_output_exit_failure();
00047     }
00048     return result;
00049 }
00050 
00051 
00052 pid_t
00053 explain_setsid_on_error(void)
00054 {
00055     pid_t           result;
00056 
00057     result = setsid();
00058     if (result < 0)
00059     {
00060         int             hold_errno;
00061 
00062         hold_errno = errno;
00063         explain_output_error("%s", explain_errno_setsid(hold_errno));
00064         errno = hold_errno;
00065     }
00066     return result;
00067 }
00068 
00069 
00070 /* vim: set ts=8 sw=4 et : */