explain_pwrite_or_die − seek and write to a file descriptor and report errors
#include <libexplain/pwrite.h>
ssize_t explain_pwrite_or_die(int fildes, const void *data, size_t data_size, off_t offset);
ssize_t explain_pwrite_on_error(int fildes, const void *data, size_t data_size, off_t offset))
The explain_pwrite_or_die function is used to call the pwrite(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_pwrite(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_pwrite_on_error function is used to call the pwrite(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_pwrite(3) function, but still returns to the caller.
fildes |
The fildes, exactly as to be passed to the pwrite(2) system call. |
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data |
The data, exactly as to be passed to the pwrite(2) system call. |
data_size
The data_size, exactly as to be passed to the pwrite(2) system call.
offset |
The offset, exactly as to be passed to the pwrite(2) system call. |
The explain_pwrite_or_die function only returns on success, see pwrite(2) for more information. On failure, prints an explanation and exits, it does not return.
The explain_pwrite_on_error function always returns the value return by the wrapped pwrite(2) system call.
The explain_pwrite_or_die function is intended to be used in a fashion similar to the following example:
ssize_t result = explain_pwrite_or_die(fildes, data, data_size, offset);
read from or write to a file descriptor at a given offset
explain pwrite(2) errors
terminate the calling process |
libexplain version 1.4
Copyright (C) 2009 Peter Miller