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curl_global_init_mem(3)         libcurl Manual         curl_global_init_mem(3)

       curl_global_init_mem - Global libcurl initialisation with memory callbacks

       #include <curl/curl.h>
       CURLcode curl_global_init_mem(long  flags,
        curl_malloc_callback  m,
        curl_free_callback  f,
        curl_realloc_callback  r,
        curl_strdup_callback  s,
        curl_calloc_callback  c );

       This  function  works  exactly as curl_global_init(3) with one addition: it allows the application to set call-
       backs to replace the otherwise used internal memory functions.

       This man page only adds documentation for the callbacks, see the curl_global_init(3) man page for all the rest.
       When you use this function, all callback arguments must be set to valid function pointers.

       The prototypes for the given callbacks should match these:

       void *malloc_callback(size_t size);
              To replace malloc()

       void free_callback(void *ptr);
              To replace free()

       void *realloc_callback(void *ptr, size_t size);
              To replace realloc()

       char *strdup_callback(const char *str);
              To replace strdup()

       void *calloc_callback(size_t nmemb, size_t size);
              To replace calloc()

       Manipulating  these  gives  considerable powers to the application to severly screw things up for libcurl. Take

       curl_global_init(3), curl_global_cleanup(3),

libcurl 7.12.0                    10 May 2004          curl_global_init_mem(3)