explain_mmap_or_die(3)

map file or device into memory and report errors

Section 3 libexplain-dev bookworm source

Description

explain_mmap_or_die

NAME

explain_mmap_or_die - map file or device into memory and report errors

SYNOPSIS

#include <libexplain/mmap.h>
void *explain_mmap_or_die(void *data, size_t data_size, int prot, int flags, int fildes, off_t offset);
void *explain_mmap_on_error(void *data, size_t data_size, int prot, int flags, int fildes, off_t offset);

DESCRIPTION

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

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

data

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

data_size

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

	prot		The prot, exactly as to be passed to the mmap(2) system call.
	flags		The flags, exactly as to be passed to the mmap(2) system call.
	fildes		The fildes, exactly as to be passed to the mmap(2) system call.
	offset		The offset, exactly as to be passed to the mmap(2) system call.

RETURN VALUE

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

The explain_mmap_on_error function always returns the value return by the wrapped mmap(2) system call.

EXAMPLE

The explain_mmap_or_die function is intended to be used in a fashion similar to the following example:

explain_mmap_or_die(data, data_size, prot, flags, fildes, offset);