explain_lseek_or_die(3) [debian man page]

explain_lseek_or_die(3) 				     Library Functions Manual					   explain_lseek_or_die(3)

NAME

       explain_lseek_or_die - reposition file offset and report errors

SYNOPSIS

       #include <libexplain/lseek.h>
       long long explain_lseek_or_die(int fildes, long long offset, int whence);

DESCRIPTION

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

       This function is intended to be used in a fashion similar to the following example:
	      long long result = explain_lseek_or_die(fildes, offset, whence);

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

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

       whence  The whence, exactly as to be passed to the lseek(2) system call.

       Returns:
	       On successful, returns the resulting offset location as measured in bytes from the beginning of the file.  On  failure,	prints	an
	       explanation and exits.

SEE ALSO

       lseek(2)
	       reposition file offset

       explain_lseek(3)
	       explain lseek(2) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2008 Peter Miller

															   explain_lseek_or_die(3)

explain_pread_or_die(3) 				     Library Functions Manual					   explain_pread_or_die(3)

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)