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curl_global_init_mem(3)

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curl_global_init_mem(3)    Library Functions Manual    curl_global_init_mem(3)

NAME
       curl_global_init_mem  - global libcurl initialization with memory call‐
       backs

SYNOPSIS
       #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);

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

       If you are using libcurl from multiple threads  or  libcurl  was  built
       with  the  threaded resolver option then the callback functions must be
       thread safe. The threaded resolver is a common build option  to  enable
       (and  in  some  cases the default) so we strongly urge you to make your
       callback functions thread safe.

       All callback arguments must be set to valid function pointers. The pro‐
       totypes for the given callbacks must 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()

              This function is  otherwise  the  same  as  curl_global_init(3),
              please refer to that man page for documentation.

CAUTION
       Manipulating  these gives considerable powers to the application to se‐
       verely screw things up for libcurl. Take care.

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       extern void *malloc_cb(size_t);
       extern void free_cb(void *);
       extern void *realloc_cb(void *, size_t);
       extern char *strdup_cb(const char *);
       extern void *calloc_cb(size_t, size_t);

       int main(void)
       {
         curl_global_init_mem(CURL_GLOBAL_DEFAULT, malloc_cb,
                              free_cb, realloc_cb,
                              strdup_cb, calloc_cb);
       }

AVAILABILITY
       Added in curl 7.12.0

RETURN VALUE
       This function returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see  libcurl-errors(3).  If   CURLOPT_ERRORBUFFER(3)   was   set   with
       curl_easy_setopt(3)  there  can be an error message stored in the error
       buffer when non-zero is returned.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   web/curl = Stability Uncommitted

SEE ALSO
       curl_global_cleanup(3), curl_global_init(3)



NOTES
       Source code for open source software components in Oracle  Solaris  can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at:
       https://github.com/oracle/solaris-userland

       The original community source was downloaded from:
       https://curl.se/download/curl-8.17.0.tar.bz2

       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.

libcurl                           2025-12-01           curl_global_init_mem(3)
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