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--- |
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c: Copyright (C) Daniel Stenberg, <[email protected]>, et al. |
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SPDX-License-Identifier: curl |
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Title: curl_global_init_mem |
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Section: 3 |
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Source: libcurl |
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See-also: |
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- curl_global_cleanup (3) |
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- curl_global_init (3) |
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Protocol: |
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- All |
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Added-in: 7.12.0 |
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--- |
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# NAME |
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curl_global_init_mem - global libcurl initialization with memory callbacks |
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# SYNOPSIS |
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~~~c |
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#include <curl/curl.h> |
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CURLcode curl_global_init_mem(long flags, |
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curl_malloc_callback m, |
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curl_free_callback f, |
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curl_realloc_callback r, |
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curl_strdup_callback s, |
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curl_calloc_callback c); |
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~~~ |
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# DESCRIPTION |
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This function works exactly as curl_global_init(3) with one addition: it |
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allows the application to set callbacks to replace the otherwise used internal |
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memory functions. |
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If you are using libcurl from multiple threads or libcurl was built with the |
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threaded resolver option then the callback functions must be thread safe. The |
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threaded resolver is a common build option to enable (and in some cases the |
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default) so we strongly urge you to make your callback functions thread safe. |
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All callback arguments must be set to valid function pointers. The |
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prototypes for the given callbacks must match these: |
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## `void *malloc_callback(size_t size);` |
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To replace malloc() |
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## `void free_callback(void *ptr);` |
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To replace free() |
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## `void *realloc_callback(void *ptr, size_t size);` |
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To replace realloc() |
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## `char *strdup_callback(const char *str);` |
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To replace strdup() |
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## `void *calloc_callback(size_t nmemb, size_t size);` |
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To replace calloc() |
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This function is otherwise the same as curl_global_init(3), please refer |
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to that man page for documentation. |
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# CAUTION |
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Manipulating these gives considerable powers to the application to severely |
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screw things up for libcurl. Take care. |
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# %PROTOCOLS% |
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# EXAMPLE |
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~~~c |
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extern void *malloc_cb(size_t); |
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extern void free_cb(void *); |
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extern void *realloc_cb(void *, size_t); |
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extern char *strdup_cb(const char *); |
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extern void *calloc_cb(size_t, size_t); |
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int main(void) |
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{ |
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curl_global_init_mem(CURL_GLOBAL_DEFAULT, malloc_cb, |
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free_cb, realloc_cb, |
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strdup_cb, calloc_cb); |
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} |
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~~~ |
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# %AVAILABILITY% |
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# RETURN VALUE |
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CURLE_OK (0) means everything was OK, non-zero means an error occurred as |
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*\<curl/curl.h\>* defines - see libcurl-errors(3). |
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