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explain_getdomainname(3)   Library Functions Manual   explain_getdomainname(3)

NAME
       explain_getdomainname - explain getdomainname(2)	errors

SYNOPSIS
       #include	<libexplain/getdomainname.h>
       const char *explain_getdomainname(char *data, size_t data_size);
       const char *explain_errno_getdomainname(int errnum, char	*data, size_t
       data_size);
       void explain_message_getdomainname(char *message, int message_size,
       char *data, size_t data_size);
       void explain_message_errno_getdomainname(char *message, int mes-
       sage_size, int errnum, char *data, size_t data_size);

DESCRIPTION
       These functions may be used to obtain explanations for errors  returned
       by the getdomainname(2) system call.

   explain_getdomainname
       const char *explain_getdomainname(char *data, size_t data_size);

       The  explain_getdomainname function is used to obtain an	explanation of
       an error	returned by the	getdomainname(2) system	call.  The  least  the
       message	will  contain  is the value of strerror(errno),	but usually it
       will do much better, and	indicate the underlying	cause in more detail.

       The errno global	variable will be used to obtain	the error value	to  be
       decoded.

       data    The  original  data,  exactly as	passed to the getdomainname(2)
	       system call.

       data_size
	       The original data_size, exactly as  passed  to  the  getdomain-
	       name(2) system call.

       Returns:
	       The message explaining the error. This message buffer is	shared
	       by all libexplain functions which do not	 supply	 a  buffer  in
	       their argument list.  This will be overwritten by the next call
	       to any libexplain function which	shares this buffer,  including
	       other threads.

       Note: This function is not thread safe, because it shares a return buf-
       fer across all threads, and many	other functions	in this	library.

       Example:	This function is intended to be	used in	a fashion  similar  to
       the following example:
	      if (getdomainname(data, data_size) < 0)
	      {
		  fprintf(stderr, "%s\n", explain_getdomainname(data,
		  data_size));
		  exit(EXIT_FAILURE);
	      }

       The above code example is available pre-packaged	as the	explain_getdo-
       mainname_or_die(3) function.

   explain_errno_getdomainname
       const char *explain_errno_getdomainname(int errnum, char	*data, size_t
       data_size);

       The explain_errno_getdomainname function	is used	to obtain an  explana-
       tion  of	 an  error  returned  by the getdomainname(2) system call. The
       least the message will contain is the  value  of	 strerror(errno),  but
       usually	it  will  do much better, and indicate the underlying cause in
       more detail.

       errnum  The error value to be decoded, usually obtained from the	 errno
	       global  variable	 just  before this function is called. This is
	       necessary if you	need to	call any code between the system  call
	       to  be explained	and this function, because many	libc functions
	       will alter the value of errno.

       data    The original data, exactly as passed  to	 the  getdomainname(2)
	       system call.

       data_size
	       The  original  data_size,  exactly  as passed to	the getdomain-
	       name(2) system call.

       Returns:
	       The message explaining the error. This message buffer is	shared
	       by  all	libexplain  functions  which do	not supply a buffer in
	       their argument list.  This will be overwritten by the next call
	       to  any libexplain function which shares	this buffer, including
	       other threads.

       Note: This function is not thread safe, because it shares a return buf-
       fer across all threads, and many	other functions	in this	library.

       Example:	 This  function	is intended to be used in a fashion similar to
       the following example:
	      if (getdomainname(data, data_size) < 0)
	      {
		  int err = errno;
		  fprintf(stderr, "%s\n", explain_errno_getdomainname(err,
		  data,	data_size));
		  exit(EXIT_FAILURE);
	      }

       The  above code example is available pre-packaged as the	explain_getdo-
       mainname_or_die(3) function.

   explain_message_getdomainname
       void explain_message_getdomainname(char *message, int message_size,
       char *data, size_t data_size);

       The  explain_message_getdomainname function is used to obtain an	expla-
       nation of an error returned by the getdomainname(2)  system  call.  The
       least  the  message  will  contain is the value of strerror(errno), but
       usually it will do much better, and indicate the	 underlying  cause  in
       more detail.

       The  errno global variable will be used to obtain the error value to be
       decoded.

       message The location in which to	store the returned message. If a suit-
	       able message return buffer is supplied, this function is	thread
	       safe.

       message_size
	       The size	in bytes of the	location in which  to  store  the  re-
	       turned message.

       data    The  original  data,  exactly as	passed to the getdomainname(2)
	       system call.

       data_size
	       The original data_size, exactly as  passed  to  the  getdomain-
	       name(2) system call.

       Example:	 This  function	is intended to be used in a fashion similar to
       the following example:
	      if (getdomainname(data, data_size) < 0)
	      {
		  char message[3000];
		  explain_message_getdomainname(message, sizeof(message),
		  data,	data_size);
		  fprintf(stderr, "%s\n", message);
		  exit(EXIT_FAILURE);
	      }

       The  above code example is available pre-packaged as the	explain_getdo-
       mainname_or_die(3) function.

   explain_message_errno_getdomainname
       void explain_message_errno_getdomainname(char *message, int mes-
       sage_size, int errnum, char *data, size_t data_size);

       The  explain_message_errno_getdomainname	 function is used to obtain an
       explanation of an error returned	by the getdomainname(2)	 system	 call.
       The least the message will contain is the value of strerror(errno), but
       usually it will do much better, and indicate the	 underlying  cause  in
       more detail.

       message The location in which to	store the returned message. If a suit-
	       able message return buffer is supplied, this function is	thread
	       safe.

       message_size
	       The  size  in  bytes  of	the location in	which to store the re-
	       turned message.

       errnum  The error value to be decoded, usually obtained from the	 errno
	       global  variable	 just  before this function is called. This is
	       necessary if you	need to	call any code between the system  call
	       to  be explained	and this function, because many	libc functions
	       will alter the value of errno.

       data    The original data, exactly as passed  to	 the  getdomainname(2)
	       system call.

       data_size
	       The  original  data_size,  exactly  as passed to	the getdomain-
	       name(2) system call.

       Example:	This function is intended to be	used in	a fashion  similar  to
       the following example:
	      if (getdomainname(data, data_size) < 0)
	      {
		  int err = errno;
		  char message[3000];
		  explain_message_errno_getdomainname(message, sizeof(mes-
		  sage), err, data, data_size);
		  fprintf(stderr, "%s\n", message);
		  exit(EXIT_FAILURE);
	      }

       The above code example is available pre-packaged	as the	explain_getdo-
       mainname_or_die(3) function.

SEE ALSO
       getdomainname(2)
	       get domain name

       explain_getdomainname_or_die(3)
	       get domain name and report errors

COPYRIGHT
       libexplain version 1.3
       Copyright (C) 2009 Peter	Miller

						      explain_getdomainname(3)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COPYRIGHT

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