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Top Forums Programming how to round up a memory address(memory alignment problem) Post 84082 by nj302 on Wednesday 21st of September 2005 04:29:46 PM
Old 09-21-2005
Still I got same bus error. The problem is that the dev is not at the address where keybuff + s_docname is

Some processors are not able to load an integer, unsigned etc, from an address which is not a multiple of the size of that integer. For 4-byte integers, the address it is loaded from, looking at the lowest two bit only, must be 00. It is called 4-byte alignment.

I need to "round up" my s_docname by some suitable calculation, leaving what is called 'padding' between docname and dev.

I need some advice on how to round this up. Thanks a lot.
 

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htonl(3)						     Library Functions Manual							  htonl(3)

NAME
htonl - Converts an unsigned 32-bit integer from host byte order to Internet network-byte order LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <arpa/inet.h> in_addr_t htonl ( in_addr_t hostint) ; STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: htonl(): XNS4.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies a 32-bit integer in host byte order. DESCRIPTION
The htonl() (host-to-network long) function converts an unsigned 32-bit integer from host byte order to Internet network-byte order. The Internet network requires address and port reference data in network-byte order. Use the htonl() function to convert address and port integers from Internet host byte order to Internet network-byte ordered integers. RETURN VALUES
Upon successful completion, the htonl() function returns a 32-bit integer in Internet network-byte order. ERRORS
Current industry standards do not define error values for the htonl() function. RELATED INFORMATION
Functions: endhostent(3), endservent(3), htons(3), ntohl(3), ntohs(3) Standards: standards(5) Network Programmer's Guide delim off htonl(3)
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