libexplain  1.4.D001
libexplain/buffer/errno/getpgid.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 
00021 #include <libexplain/buffer/einval.h>
00022 #include <libexplain/buffer/errno/generic.h>
00023 #include <libexplain/buffer/errno/getpgid.h>
00024 #include <libexplain/buffer/esrch.h>
00025 #include <libexplain/buffer/pid_t_star.h>
00026 #include <libexplain/explanation.h>
00027 
00028 
00029 static void
00030 explain_buffer_errno_getpgid_system_call(explain_string_buffer_t *sb, int
00031     errnum, pid_t pid)
00032 {
00033     (void)errnum;
00034     explain_string_buffer_puts(sb, "getpgid(pid = ");
00035     explain_buffer_pid_t(sb, pid);
00036     explain_string_buffer_putc(sb, ')');
00037 }
00038 
00039 
00040 void
00041 explain_buffer_errno_getpgid_explanation(explain_string_buffer_t *sb,
00042     int errnum, const char *syscall_name, pid_t pid)
00043 {
00044     /*
00045      * http://www.opengroup.org/onlinepubs/009695399/functions/getpgid.html
00046      */
00047     switch (errnum)
00048     {
00049     case EINVAL:
00050         too_small:
00051         explain_buffer_einval_too_small(sb, "pid", pid);
00052         break;
00053 
00054     case ESRCH:
00055         if (pid < 0)
00056             goto too_small;
00057         explain_buffer_esrch(sb, "pid", pid);
00058         break;
00059 
00060     default:
00061         explain_buffer_errno_generic(sb, errnum, syscall_name);
00062         break;
00063     }
00064 }
00065 
00066 
00067 void
00068 explain_buffer_errno_getpgid(explain_string_buffer_t *sb, int errnum, pid_t pid)
00069 {
00070     explain_explanation_t exp;
00071 
00072     explain_explanation_init(&exp, errnum);
00073     explain_buffer_errno_getpgid_system_call(&exp.system_call_sb, errnum, pid);
00074     explain_buffer_errno_getpgid_explanation(&exp.explanation_sb, errnum,
00075         "getpgid", pid);
00076     explain_explanation_assemble(&exp, sb);
00077 }
00078 
00079 
00080 /* vim: set ts=8 sw=4 et : */