MEM_OPEN(3debug)
NAME
mem_open, mem_check, mem_alloc, mem_realloc, mem_free, mem_close - memory allocation routines for debugging
LIBRARIES
Debug Library (-ldebug)
SYNOPSIS
#include <debug/memory.h> void mem_open(void (*fail)(const char *fmt, ...)); void mem_check(void); void *mem_alloc(size_t size); void *mem_realloc(void *ptr, size_t size); void mem_free(void *ptr); void mem_close(void);
DESCRIPTION
mem_open() initializes the memory debugging system. It should be called
before any of the other routines. You can specify a callback function
which should be called whenever something bad happens, or NULL in which
case the default error handler will be used. The default error handler
logs error messages using the debug logging routines and exit.
mem_check() check all the allocated memory areas. This is called every
time memory is allocated or freed. You can also call it anytime you
think memory might be corrupted.
mem_alloc() allocates size bytes and returns a pointer to the allocated
memory. The memory is not cleared.
mem_realloc() changes the size of the memory block pointed to by ptr to
size bytes. The contents will be unchanged to the minimum of the old
and new sizes; newly allocated memory will be uninitialized. If ptr is
NULL, the call is equivalent to mem_alloc(size); if size is equal to
zero, the call is equivalent to mem_free(ptr). Unless ptr is NULL, it
must have been returned by an earlier call to mem_alloc() or mem_realloc().
mem_free() frees the memory space pointed to by ptr, which must have
been returned by a previous call to mem_alloc() or mem_realloc(). If
ptr is NULL, no operation is performed.
mem_close() checks for leaks and possible memory corruptions.
RETURN VALUE
For mem_alloc(), the value returned is a pointer to the allocated memory, which is suitably aligned for any kind of variable, or NULL if the
request fails.
mem_realloc() returns a pointer to the newly allocated memory, which is
suitably aligned for any kind of variable and may be different from
ptr, or NULL if the request fails or if size was equal to 0. If
mem_realloc() fails the original block is left untouched - it is not
freed or moved.
All other functions returns no value.
NOTES
- If the default fail callback is used or if this routines are combined
with the log routines, care should be taken to call open and close
functions in the right order. The correct order is as follows:
- mem_open (NULL);
log_open (NULL,LOG_NORMAL,LOG_HAVE_COLORS | LOG_PRINT_FUNCTION);
atexit (mem_close);
atexit (log_close); - Of course, atexit(3) should only be used if the program will not forked.
- None of the libdebug routines are thread-safe. I'm not planning to change this either! For more information, please see http://threading.2038bug.com/
SEE ALSO
AUTHOR
- Written by Abraham vd Merwe <abz@blio.com>