96 lines
2.3 KiB
Markdown
96 lines
2.3 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, 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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---
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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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# 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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Added in 7.12.0
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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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