NAME

       explain_pread_or_die - seek and read from a file descriptor and report errors

SYNOPSIS

       #include <libexplain/pread.h>
       ssize_t explain_pread_or_die(int fildes, void *data, size_t data_size, off_t offset);
       ssize_t explain_pread_on_error(int fildes, void *data, size_t data_size, off_t offset))

DESCRIPTION

       The  explain_pread_or_die function is used to call the pread(2) system call. On failure an
       explanation will be printed to stderr, obtained from the  explain_pread(3)  function,  and
       then the process terminates by calling exit(EXIT_FAILURE).

       The  explain_pread_on_error  function is used to call the pread(2) system call. On failure
       an explanation will be printed to stderr, obtained from the explain_pread(3) function, but
       still returns to the caller.

       fildes  The fildes, exactly as to be passed to the pread(2) system call.

       data    The data, exactly as to be passed to the pread(2) system call.

       data_size
               The data_size, exactly as to be passed to the pread(2) system call.

       offset  The offset, exactly as to be passed to the pread(2) system call.

RETURN VALUE

       The  explain_pread_or_die  function  only  returns  on  success,  see  pread(2)  for  more
       information. On failure, prints an explanation and exits, it does not return.

       The explain_pread_on_error function  always  returns  the  value  return  by  the  wrapped
       pread(2) system call.

EXAMPLE

       The  explain_pread_or_die  function  is  intended  to  be used in a fashion similar to the
       following example:
              ssize_t result = explain_pread_or_die(fildes, data, data_size, offset);

SEE ALSO

       pread(2)
               read from a file descriptor at a given offset

       explain_pread(3)
               explain pread(2) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2009 Peter Miller

                                                                          explain_pread_or_die(3)