/* xgethostname.c -- return current hostname with unlimited length
- Copyright (C) 1992, 1996, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1992, 1996, 2000, 2001, 2003 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
# include <config.h>
#endif
+#include <stdlib.h>
#include <sys/types.h>
#include <errno.h>
#endif
#include "error.h"
+#include "xalloc.h"
+
+#ifndef ENAMETOOLONG
+# define ENAMETOOLONG 9999
+#endif
#ifndef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif
int gethostname ();
-char *xmalloc ();
-char *xrealloc ();
#ifndef INITIAL_HOSTNAME_LENGTH
# define INITIAL_HOSTNAME_LENGTH 34
#endif
+/* Return the current hostname in malloc'd storage.
+ If malloc fails, exit.
+ Upon any other failure, return NULL. */
char *
xgethostname ()
{
char *hostname;
size_t size;
- int err;
size = INITIAL_HOSTNAME_LENGTH;
/* Use size + 1 here rather than size to work around the bug
- in SunOS5.5's gethostname whereby it NUL-terminates HOSTNAME
+ in SunOS 5.5's gethostname whereby it NUL-terminates HOSTNAME
even when the name is longer than the supplied buffer. */
hostname = xmalloc (size + 1);
while (1)
{
int k = size - 1;
+ int err;
errno = 0;
hostname[k] = '\0';
err = gethostname (hostname, size);
if (err >= 0 && hostname[k] == '\0')
break;
-#ifdef ENAMETOOLONG
else if (err < 0 && errno != ENAMETOOLONG && errno != 0)
-#else
- else if (err < 0 && errno != 0)
-#endif
- error (EXIT_FAILURE, errno, "gethostname");
+ {
+ int saved_errno = errno;
+ free (hostname);
+ errno = saved_errno;
+ return NULL;
+ }
size *= 2;
hostname = xrealloc (hostname, size + 1);
}