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77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* xgethostname.c -- return current hostname with unlimited length
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Copyright (C) 1992, 1996, 2000, 2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* written by Jim Meyering */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include "error.h"
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#include "xalloc.h"
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#ifndef ENAMETOOLONG
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# define ENAMETOOLONG 9999
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#endif
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#ifndef EXIT_FAILURE
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# define EXIT_FAILURE 1
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#endif
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int gethostname ();
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#ifndef INITIAL_HOSTNAME_LENGTH
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# define INITIAL_HOSTNAME_LENGTH 34
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#endif
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char *
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xgethostname ()
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{
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char *hostname;
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size_t size;
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size = INITIAL_HOSTNAME_LENGTH;
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/* Use size + 1 here rather than size to work around the bug
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in SunOS5.5's gethostname whereby it NUL-terminates HOSTNAME
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even when the name is longer than the supplied buffer. */
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hostname = xmalloc (size + 1);
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while (1)
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{
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int k = size - 1;
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int err;
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errno = 0;
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hostname[k] = '\0';
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err = gethostname (hostname, size);
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if (err >= 0 && hostname[k] == '\0')
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break;
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else if (err < 0 && errno != ENAMETOOLONG && errno != 0)
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error (EXIT_FAILURE, errno, "gethostname");
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size *= 2;
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hostname = xrealloc (hostname, size + 1);
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}
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return hostname;
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}
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