1curl_global_init_mem(3) libcurl Manual curl_global_init_mem(3)
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6 curl_global_init_mem - Global libcurl initialization with memory call‐
7 backs
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10 #include <curl/curl.h>
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12 CURLcode curl_global_init_mem(long flags,
13 curl_malloc_callback m,
14 curl_free_callback f,
15 curl_realloc_callback r,
16 curl_strdup_callback s,
17 curl_calloc_callback c);
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20 This function works exactly as curl_global_init(3) with one addition:
21 it allows the application to set callbacks to replace the otherwise
22 used internal memory functions.
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24 If you are using libcurl from multiple threads or libcurl was built
25 with the threaded resolver option then the callback functions must be
26 thread safe. The threaded resolver is a common build option to enable
27 (and in some cases the default) so we strongly urge you to make your
28 callback functions thread safe.
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30 All callback arguments must be set to valid function pointers. The pro‐
31 totypes for the given callbacks must match these:
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33 void *malloc_callback(size_t size);
34 To replace malloc()
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36 void free_callback(void *ptr);
37 To replace free()
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39 void *realloc_callback(void *ptr, size_t size);
40 To replace realloc()
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42 char *strdup_callback(const char *str);
43 To replace strdup()
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45 void *calloc_callback(size_t nmemb, size_t size);
46 To replace calloc()
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48 This function is otherwise the same as curl_global_init(3), please re‐
49 fer to that man page for documentation.
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52 Manipulating these gives considerable powers to the application to se‐
53 verely screw things up for libcurl. Take care!
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56 curl_global_init_mem(CURL_GLOBAL_DEFAULT, curl_malloc_cb,
57 curl_free_cb, curl_realloc_cb,
58 curl_strdup_cb, curl_calloc_cb);
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61 Added in 7.12.0
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64 CURLE_OK (0) means everything was ok, non-zero means an error occurred
65 as <curl/curl.h> defines - see libcurl-errors(3).
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68 curl_global_init(3), curl_global_cleanup(3),
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72libcurl 7.85.0 May 17, 2022 curl_global_init_mem(3)