explain_close(3)					     Library Functions Manual						  explain_close(3)

NAME

       explain_close - explain close(2) errors

SYNOPSIS

       #include <libexplain/close.h>
       const char *explain_close(int fildes);
       const char *explain_errno_close(int errnum, int fildes);
       void explain_message_close(char *message, int message_size, int fildes);
       void explain_message_errno_close(char *message, int message_size, int errnum, int fildes);

DESCRIPTION

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

   explain_close
       const char *explain_close(int fildes);

       The  explain_close  function is used to obtain an explanation of an error returned by the close(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.

       This function is intended to be used in a fashion similar to the following example:
	      if (close(fildes) < 0)
	      {
		  fprintf(stderr, "%s
", explain_close(fildes));
		  exit(EXIT_FAILURE);
	      }

       fildes  The original fildes, exactly as passed to the close(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 buffer across all threads, and many other functions in this library.

   explain_errno_close
       const char *explain_errno_close(int errnum, int fildes);

       The explain_errno_close function is used to obtain an explanation of an error returned by the close(2) 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 following example:
	      if (close(fildes) < 0)
	      {
		  int err = errno;
		  fprintf(stderr, "%s
", explain_close(err, fildes));
		  exit(EXIT_FAILURE);
	      }

       errnum  The error value to be decoded, usually obtained from the errno global variable just before this function is called.  This is neces-
	       sary 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.

       fildes  The original fildes, exactly as passed to the close(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 buffer across all threads, and many other functions in this library.

   explain_message_close
       void explain_message_close(char *message, int message_size, int fildes);

       The  explain_message_close  function is used to obtain an explanation of an error returned by the close(2) system call.	The least the mes-
       sage 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 following example:
	      if (close(fildes) < 0)
	      {
		  char message[3000];
		  explain_message_close(message, sizeof(message), fildes);
		  fprintf(stderr, "%s
", message);
		  exit(EXIT_FAILURE);
	      }

       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 returned message.

       fildes  The original fildes, exactly as passed to the close(2) system call.

   explain_message_errno_close
       void explain_message_errno_close(char *message, int message_size, int errnum, int fildes);

       The  explain_message_errno_close function is used to obtain an explanation of an error returned by the close(2) 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 following example:
	      if (close(fildes) < 0)
	      {
		  int err = errno;
		  char message[3000];
		  explain_message_errno_close(message, sizeof(message), err, fildes);
		  fprintf(stderr, "%s
", message);
		  exit(EXIT_FAILURE);
	      }

       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 returned message.

       errnum  The error value to be decoded, usually obtained from the errno global variable just before this function is called.  This is neces-
	       sary 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.

       fildes  The original fildes, exactly as passed to the close(2) system call.

SEE ALSO

       close   close a file descriptor

       explain_close_or_die
	       close a file descriptor and report errors

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2008 Peter Miller

																  explain_close(3)