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 0.19
Copyright (C) 2009 Peter Miller
explain_pread_or_die(3)