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Full Discussion: Memory allocation in C
Top Forums Programming Memory allocation in C Post 302438057 by unx_freak on Sunday 18th of July 2010 05:14:07 AM
Old 07-18-2010
Memory allocation in C

Hi Experts
I need some help in static memory allocation in C. I have a program in which I declared 2 variables, one char array and one integer. I was little surprised to see the addresses of the variables.

First:

Code:
int x;
char a[2];
printf("%u %u\n', &x, a);

I got the addresses displayed as : 3219437172 3219437170
The above result is straight forward wherein the array a got 2 bytes allocated.

Second:

When I changed the program as below:
Code:
int x;
char a[3];
printf("%u %u\n', &x, a);

I got the addresses displayed as : 3219437172 3219437144
The array a got allocated 28 bytes when the declaration is for 3 bytes.

Why so?
 

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NE_MALLOC(3)							neon API reference						      NE_MALLOC(3)

NAME
ne_malloc, ne_calloc, ne_realloc, ne_strdup, ne_strndup, ne_oom_callback - memory allocation wrappers SYNOPSIS
#include <ne_alloc.h> void *ne_malloc (size_t size); void *ne_calloc (size_t size); void *ne_realloc (void *size, size_t len); char *ne_strdup (const char *s, size_t size); char *ne_strndup (const char *s, size_t size); void ne_oom_callback (void (*callback)(void)); DESCRIPTION
The functions ne_malloc, ne_calloc, ne_realloc, ne_strdup and ne_strdnup provide wrappers for the equivalent functions in the standard C library. The wrappers provide the extra guarantee that if the C library equivalent returns NULL when no memory is available, an optional callback will be called, and the library will then call abort(). ne_oom_callback registers a callback which will be invoked if an out of memory error is detected. NOTES
If the operating system uses optimistic memory allocation, the C library memory allocation routines will not return NULL, so it is not pos- sible to gracefully handle memory allocation failures. AUTHOR
Joe Orton <neon@webdav.org>. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWneon | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for Neon is available on http://opensolaris.org. neon 0.25.5 20 January 2006 NE_MALLOC(3)
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