kc3-lang/gnulib/lib/xgethostname.c

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• Hash : 9de26050
  Author :
  Date : 2009-09-02T17:06:43
  

  errno: use consistently
  
  * lib/c-stack.c (ENOTSUP): <errno.h> guarantees a definition.
  * lib/canonicalize-lgpl.c (ENAMETOOLONG): Likewise.
  * lib/canonicalize.c (ELOOP): Likewise.
  * lib/inet_ntop.c (EAFNOSUPPORT): Likewise.
  * lib/inet_pton.c (EAFNOSUPPORT): Likewise.
  * lib/lchown.c (EOPNOTSUPP): Likewise.
  * lib/openat-priv.h (ENOSYS, EOPNOTSUPP): Likewise.
  * lib/savewd.c (ESTALE): Likewise.
  * lib/settime.c (ENOSYS): Likewise.
  * lib/utimens.c (ENOSYS): Likewise.
  * lib/xgethostname.c (ENAMETOOLONG): Likewise.
  * lib/chdir-safer.c (ELOOP): Likewise.
  (chdir_no_follow): Use HAVE_READLINK, not ELOOP, as witness.
  * modules/c-stack (Depends-on): Add errno.
  * modules/canonicalize (Depends-on): Likewise.
  * modules/chdir-safer (Depends-on): Likewise.
  * modules/fdopendir (Depends-on): Likewise.
  * modules/inet_ntop (Depends-on): Likewise.
  * modules/inet_pton (Depends-on): Likewise.
  * modules/lchown (Depends-on): Likewise.
  * modules/openat (Depends-on): Likewise.
  * modules/savewd (Depends-on): Likewise.
  * modules/settime (Depends-on): Likewise.
  * m4/chdir-safer.m4 (gl_CHDIR_SAFER): Check for readlink.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• lib/xgethostname.c

• /* xgethostname.c -- return current hostname with unlimited length
  
     Copyright (C) 1992, 1996, 2000, 2001, 2003, 2004, 2005, 2006, 2009
     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 <http://www.gnu.org/licenses/>.  */
  
  /* written by Jim Meyering */
  
  #include <config.h>
  
  /* Specification.  */
  #include "xgethostname.h"
  
  #include <stdlib.h>
  #include <errno.h>
  #include <unistd.h>
  
  #include "xalloc.h"
  
  #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 and set errno.  */
  char *
  xgethostname (void)
  {
    char *hostname = NULL;
    size_t size = INITIAL_HOSTNAME_LENGTH;
  
    while (1)
      {
        /* Use SIZE_1 here rather than SIZE to work around the bug in
  	 SunOS 5.5's gethostname whereby it NUL-terminates HOSTNAME
  	 even when the name is as long as the supplied buffer.  */
        size_t size_1;
  
        hostname = x2realloc (hostname, &size);
        size_1 = size - 1;
        hostname[size_1 - 1] = '\0';
        errno = 0;
  
        if (gethostname (hostname, size_1) == 0)
  	{
  	  if (! hostname[size_1 - 1])
  	    break;
  	}
        else if (errno != 0 && errno != ENAMETOOLONG && errno != EINVAL
  	       /* OSX/Darwin does this when the buffer is not large enough */
  	       && errno != ENOMEM)
  	{
  	  int saved_errno = errno;
  	  free (hostname);
  	  errno = saved_errno;
  	  return NULL;
  	}
      }
  
    return hostname;
  }
  

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