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explain_pathconf(3)	   Library Functions Manual	   explain_pathconf(3)

NAME
       explain_pathconf	- explain pathconf(3) errors

SYNOPSIS
       #include	<libexplain/pathconf.h>
       const char *explain_pathconf(const char *pathname, int name);
       const  char  *explain_errno_pathconf(int	 errnum, const char *pathname,
       int name);
       void explain_message_pathconf(char *message,  int  message_size,	 const
       char *pathname, int name);
       void  explain_message_errno_pathconf(char  *message,  int message_size,
       int errnum, const char *pathname, int name);

DESCRIPTION
       These functions may be used to obtain explanations for errors  returned
       by the pathconf(3) system call.

   explain_pathconf
       const char *explain_pathconf(const char *pathname, int name);

       The  explain_pathconf  function	is used	to obtain an explanation of an
       error returned by the pathconf(3) 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.

       This  function  is intended to be used in a fashion similar to the fol-
       lowing example:
	      if (pathconf(pathname, name) < 0)
	      {
		  fprintf(stderr, "%s\n", explain_pathconf(pathname, name));
		  exit(EXIT_FAILURE);
	      }

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

       pathname
	       The  original  pathname,	 exactly  as passed to the pathconf(3)
	       system call.

       name    The original name, exactly as passed to the pathconf(3)	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,  in-
	       cluding 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.

   explain_errno_pathconf
       const char *explain_errno_pathconf(int errnum,  const  char  *pathname,
       int name);

       The explain_errno_pathconf function is used to obtain an	explanation of
       an error	returned by the	pathconf(3) system call.  The least  the  mes-
       sage will contain is the	value of strerror(errnum), but usually it will
       do much better, and indicate the	underlying cause in more detail.

       This function is	intended to be used in a fashion similar to  the  fol-
       lowing example:
	      if (pathconf(pathname, name) < 0)
	      {
		  int err = errno;
		  fprintf(stderr, "%s\n", explain_errno_pathconf(err, pathname,	name));
		  exit(EXIT_FAILURE);
	      }

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

       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.

       pathname
	       The original pathname, exactly as  passed  to  the  pathconf(3)
	       system call.

       name    The  original name, exactly as passed to	the pathconf(3)	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, in-
	       cluding 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.

   explain_message_pathconf
       void  explain_message_pathconf(char  *message,  int message_size, const
       char *pathname, int name);

       The explain_message_pathconf function may be used to  obtain an	expla-
       nation  of an error returned by the pathconf(3) 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 de-
       tail.

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

       This  function  is intended to be used in a fashion similar to the fol-
       lowing example:
	      if (pathconf(pathname, name) < 0)
	      {
		  char message[3000];
		  explain_message_pathconf(message, sizeof(message), pathname, name);
		  fprintf(stderr, "%s\n", message);
		  exit(EXIT_FAILURE);
	      }

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

       message The  location  in  which	 to  store the returned	message.  If a
	       suitable	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.

       pathname
	       The original pathname, exactly as  passed  to  the  pathconf(3)
	       system call.

       name    The  original name, exactly as passed to	the pathconf(3)	system
	       call.

   explain_message_errno_pathconf
       void explain_message_errno_pathconf(char	 *message,  int	 message_size,
       int errnum, const char *pathname, int name);

       The  explain_message_errno_pathconf  function  may be used to obtain an
       explanation of an error returned	by the pathconf(3) system  call.   The
       least  the  message  will contain is the	value of strerror(errnum), but
       usually it will do much better, and indicate the	 underlying  cause  in
       more detail.

       This  function  is intended to be used in a fashion similar to the fol-
       lowing example:
	      if (pathconf(pathname, name) < 0)
	      {
		  int err = errno;
		  char message[3000];
		  explain_message_errno_pathconf(message, sizeof(message), err,
		      pathname,	name);
		  fprintf(stderr, "%s\n", message);
		  exit(EXIT_FAILURE);
	      }

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

       message The  location  in  which	 to  store the returned	message.  If a
	       suitable	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.

       pathname
	       The original pathname, exactly as  passed  to  the  pathconf(3)
	       system call.

       name    The  original name, exactly as passed to	the pathconf(3)	system
	       call.

SEE ALSO
       pathconf(3)
	       get configuration values	for files

       explain_pathconf_or_die(3)
	       get configuration values	for files and report errors

COPYRIGHT
       libexplain version 1.3
       Copyright (C) 2008 Peter	Miller

							   explain_pathconf(3)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COPYRIGHT

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