Mercurial > gnulib
view lib/xgetdomainname.c @ 40086:d6de7c427079
stdopen: modernize and simplify
* lib/stdopen.c: Update copyright date
Do not include sys/types.h; no longer needed these days.
(stdopen): Use C99-style decl in loop. Return int errno
value, rather than just a bool. Do not worry about fd mismatches,
since the caller cares only if 0, 1, 2 are occupied.
* lib/stdopen.h: No need to include <stdbool.h>.
* m4/stdopen.m4: Remove.
* modules/stdopen: New file.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 05 Jan 2019 18:02:32 -0800 |
parents | b06060465f09 |
children |
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/* xgetdomainname.c -- Return the NIS domain name, without size limitations. Copyright (C) 1992, 1996, 2000-2001, 2003-2004, 2006, 2008-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* Based on xgethostname.c, written by Jim Meyering. */ #include <config.h> /* Specification. */ #include "xgetdomainname.h" /* Get getdomainname. */ #include <unistd.h> /* Get errno. */ #include <errno.h> /* Get free. */ #include <stdlib.h> #include "xalloc.h" #ifndef INITIAL_DOMAINNAME_LENGTH # define INITIAL_DOMAINNAME_LENGTH 34 #endif /* Return the NIS domain name of the machine, in malloc'd storage. WARNING! The NIS domain name is unrelated to the fully qualified host name of the machine. It is also unrelated to email addresses. WARNING! The NIS domain name is usually the empty string or "(none)" when not using NIS. If malloc fails, exit. Upon any other failure, set errno and return NULL. */ char * xgetdomainname (void) { char *domainname; size_t size; size = INITIAL_DOMAINNAME_LENGTH; domainname = xmalloc (size); while (1) { int k = size - 1; int err; errno = 0; domainname[k] = '\0'; err = getdomainname (domainname, size); if (err >= 0 && domainname[k] == '\0') break; else if (err < 0 && errno != EINVAL) { int saved_errno = errno; free (domainname); errno = saved_errno; return NULL; } size *= 2; domainname = xrealloc (domainname, size); } return domainname; }