dalloc

A simple, thread safe, drop-in memory allocation debugging lib in C89

Usage

dalloc.c and dalloc.h should be dropped into an existing project and compiled with the -DDALLOC flag to define the macro that enables dalloc. dalloc will replace free(), malloc(), calloc(), realloc(), reallocarray(), strdup() and strndup() by a more secure version that will check for buffer overflow and memory leak.

dalloc will also output a recap at the end of the program if the compiler supports the destructor attribute.

vasprintf() and asprintf() are also supported when compiling for C99+.

_DEFAULT_SOURCE or other feature test macros may be needed to use these functions outside of dalloc.

Functions

All functions do nothing when DALLOC is not defined.

dalloc_check_overflow(void)

Output all memory overflow to stderr and return the sum of all overflow.

dalloc_check_free(void)

Output all allocation that were not freed to stderr.

dalloc_check_all(void)

Run both dalloc_check_free() and dalloc_check_overflow() on program's exit.

dalloc_ignore(void *p)

Ignore the pointer in argument for memory leak check. This can be useful when developing an application that never stop.

dalloc_comment(void p, char comment)

Add a comment to a pointer so it is more easy to know what the pointer stands for just by looking at the error message from dalloc.

dalloc_query(void *p)

Output informations about p to stderr.

Notes

An error with "Unknown pointer" is may caused by a use after free or when using free or realloc on a pointer allocated with a function not supported by dalloc.