explain_pwrite_or_die3
Seek and write to a file descriptor and report errors
Usage
#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))
Overview
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. |
|---|---|
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. |
Return value
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.
Examples
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);Releases
6 releases since Debian 7 (Wheezy); the text changed 1 time.