2 This file is part of GNUnet.
3 (C) 2006, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file include/gnunet_common.h
23 * @brief commonly used definitions; globals in this file
24 * are exempt from the rule that the module name ("common")
25 * must be part of the symbol name.
27 * @author Christian Grothoff
30 #ifndef GNUNET_COMMON_H
31 #define GNUNET_COMMON_H
34 #include <sys/socket.h>
37 #include <netinet/in.h>
50 * Version of the API (for entire gnunetutil.so library).
52 #define GNUNET_UTIL_VERSION 0x00090100
55 * Named constants for return values. The following
56 * invariants hold: "GNUNET_NO == 0" (to allow "if (GNUNET_NO)")
57 * "GNUNET_OK != GNUNET_SYSERR", "GNUNET_OK != GNUNET_NO", "GNUNET_NO != GNUNET_SYSERR"
58 * and finally "GNUNET_YES != GNUNET_NO".
61 #define GNUNET_SYSERR -1
65 #define GNUNET_MIN(a,b) (((a) < (b)) ? (a) : (b))
67 #define GNUNET_MAX(a,b) (((a) > (b)) ? (a) : (b))
69 /* some systems use one underscore only, and mingw uses no underscore... */
72 #define __BYTE_ORDER _BYTE_ORDER
75 #define __BYTE_ORDER BYTE_ORDER
81 #define __BIG_ENDIAN _BIG_ENDIAN
84 #define __BIG_ENDIAN BIG_ENDIAN
88 #ifndef __LITTLE_ENDIAN
90 #define __LITTLE_ENDIAN _LITTLE_ENDIAN
93 #define __LITTLE_ENDIAN LITTLE_ENDIAN
102 # if __BYTE_ORDER == __LITTLE_ENDIAN
103 # define GNUNET_htobe16(x) __bswap_16 (x)
104 # define GNUNET_htole16(x) (x)
105 # define GNUNET_be16toh(x) __bswap_16 (x)
106 # define GNUNET_le16toh(x) (x)
108 # define GNUNET_htobe32(x) __bswap_32 (x)
109 # define GNUNET_htole32(x) (x)
110 # define GNUNET_be32toh(x) __bswap_32 (x)
111 # define GNUNET_le32toh(x) (x)
113 # define GNUNET_htobe64(x) __bswap_64 (x)
114 # define GNUNET_htole64(x) (x)
115 # define GNUNET_be64toh(x) __bswap_64 (x)
116 # define GNUNET_le64toh(x) (x)
118 # if __BYTE_ORDER == __BIG_ENDIAN
119 # define GNUNET_htobe16(x) (x)
120 # define GNUNET_htole16(x) __bswap_16 (x)
121 # define GNUNET_be16toh(x) (x)
122 # define GNUNET_le16toh(x) __bswap_16 (x)
124 # define GNUNET_htobe32(x) (x)
125 # define GNUNET_htole32(x) __bswap_32 (x)
126 # define GNUNET_be32toh(x) (x)
127 # define GNUNET_le32toh(x) __bswap_32 (x)
129 # define GNUNET_htobe64(x) (x)
130 # define GNUNET_htole64(x) __bswap_64 (x)
131 # define GNUNET_be64toh(x) (x)
132 # define GNUNET_le64toh(x) __bswap_64 (x)
139 * gcc-ism to get packed structs.
141 #define GNUNET_PACKED __attribute__((packed))
144 * gcc-ism to document unused arguments
146 #define GNUNET_UNUSED __attribute__((unused))
149 * gcc-ism to document functions that don't return
151 #define GNUNET_NORETURN __attribute__((noreturn))
155 * gcc 4.x-ism to pack structures even on W32 (to be used before structs)
157 #define GNUNET_NETWORK_STRUCT_BEGIN \
158 _Pragma("pack(push)") \
162 * gcc 4.x-ism to pack structures even on W32 (to be used after structs)
164 #define GNUNET_NETWORK_STRUCT_END _Pragma("pack(pop)")
167 #error gcc 4.x or higher required on W32 systems
170 * Good luck, GNUNET_PACKED should suffice, but this won't work on W32
172 #define GNUNET_NETWORK_STRUCT_BEGIN
175 * Good luck, GNUNET_PACKED should suffice, but this won't work on W32
177 #define GNUNET_NETWORK_STRUCT_END
180 /* ************************ super-general types *********************** */
182 GNUNET_NETWORK_STRUCT_BEGIN
185 * Header for all communications.
187 struct GNUNET_MessageHeader
191 * The length of the struct (in bytes, including the length field itself),
192 * in big-endian format.
194 uint16_t size GNUNET_PACKED;
197 * The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
199 uint16_t type GNUNET_PACKED;
202 GNUNET_NETWORK_STRUCT_END
205 * @brief 512-bit hashcode
209 uint32_t bits[512 / 8 / sizeof (uint32_t)]; /* = 16 */
214 GNUNET_NETWORK_STRUCT_BEGIN
217 * The identity of the host (basically the SHA-512 hashcode of
220 struct GNUNET_PeerIdentity
222 GNUNET_HashCode hashPubKey GNUNET_PACKED;
224 GNUNET_NETWORK_STRUCT_END
227 * Function called with a filename.
230 * @param filename complete filename (absolute path)
231 * @return GNUNET_OK to continue to iterate,
232 * GNUNET_SYSERR to abort iteration with error!
234 typedef int (*GNUNET_FileNameCallback) (void *cls, const char *filename);
237 /* ****************************** logging ***************************** */
242 enum GNUNET_ErrorType
244 GNUNET_ERROR_TYPE_UNSPECIFIED = -1,
245 GNUNET_ERROR_TYPE_NONE = 0,
246 GNUNET_ERROR_TYPE_ERROR = 1,
247 GNUNET_ERROR_TYPE_WARNING = 2,
248 GNUNET_ERROR_TYPE_INFO = 4,
249 GNUNET_ERROR_TYPE_DEBUG = 8,
250 GNUNET_ERROR_TYPE_INVALID = 16,
251 GNUNET_ERROR_TYPE_BULK = 32
256 * User-defined handler for log messages.
259 * @param kind severeity
260 * @param component what component is issuing the message?
261 * @param date when was the message logged?
262 * @param message what is the message
264 typedef void (*GNUNET_Logger) (void *cls, enum GNUNET_ErrorType kind,
265 const char *component, const char *date,
266 const char *message);
270 * Number of log calls to ignore.
272 extern unsigned int skip_log;
274 #if !defined(GNUNET_CULL_LOGGING)
276 GNUNET_get_log_call_status (int caller_level, const char *comp,
277 const char *file, const char *function, int line);
282 * @param kind how serious is the error?
283 * @param message what is the message (format string)
284 * @param ... arguments for format string
287 GNUNET_log_nocheck (enum GNUNET_ErrorType kind, const char *message, ...);
290 #if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
291 #define _GNUNET_BOOLEAN_EXPR(expr) \
293 int _gnunet_boolean_var_; \
295 _gnunet_boolean_var_ = 1; \
297 _gnunet_boolean_var_ = 0; \
298 _gnunet_boolean_var_; \
300 #define GN_LIKELY(expr) (__builtin_expect (_GNUNET_BOOLEAN_EXPR(expr), 1))
301 #define GN_UNLIKELY(expr) (__builtin_expect (_GNUNET_BOOLEAN_EXPR(expr), 0))
303 #define GN_LIKELY(expr) (expr)
304 #define GN_UNLIKELY(expr) (expr)
307 #if !defined(GNUNET_LOG_CALL_STATUS)
308 #define GNUNET_LOG_CALL_STATUS -1
312 * Log function that specifies an alternative component.
313 * This function should be used by plugins.
315 * @param kind how serious is the error?
316 * @param comp component responsible for generating the message
317 * @param message what is the message (format string)
318 * @param ... arguments for format string
321 GNUNET_log_from_nocheck (enum GNUNET_ErrorType kind, const char *comp,
322 const char *message, ...);
324 #if !defined(GNUNET_CULL_LOGGING)
325 #define GNUNET_log_from(kind,comp,...) do { int log_line = __LINE__;\
326 static int log_call_enabled = GNUNET_LOG_CALL_STATUS;\
327 if ((GNUNET_EXTRA_LOGGING > 0) || ((GNUNET_ERROR_TYPE_DEBUG & kind) == 0)) {\
328 if (GN_UNLIKELY(log_call_enabled == -1))\
329 log_call_enabled = GNUNET_get_log_call_status ((kind) & (~GNUNET_ERROR_TYPE_BULK), comp, __FILE__, __FUNCTION__, log_line);\
330 if (GN_UNLIKELY(skip_log > 0)) {skip_log--;}\
332 if (GN_UNLIKELY(log_call_enabled))\
333 GNUNET_log_from_nocheck (kind, comp, __VA_ARGS__);\
338 #define GNUNET_log(kind,...) do { int log_line = __LINE__;\
339 static int log_call_enabled = GNUNET_LOG_CALL_STATUS;\
340 if ((GNUNET_EXTRA_LOGGING > 0) || ((GNUNET_ERROR_TYPE_DEBUG & kind) == 0)) {\
341 if (GN_UNLIKELY(log_call_enabled == -1))\
342 log_call_enabled = GNUNET_get_log_call_status ((kind) & (~GNUNET_ERROR_TYPE_BULK), NULL, __FILE__, __FUNCTION__, log_line);\
343 if (GN_UNLIKELY(skip_log > 0)) {skip_log--;}\
345 if (GN_UNLIKELY(log_call_enabled))\
346 GNUNET_log_nocheck (kind, __VA_ARGS__);\
351 #define GNUNET_log(...)
352 #define GNUNET_log_from(...)
357 * Abort the process, generate a core dump if possible.
360 GNUNET_abort (void) GNUNET_NORETURN;
363 * Ignore the next n calls to the log function.
365 * @param n number of log calls to ignore
366 * @param check_reset GNUNET_YES to assert that the log skip counter is currently zero
369 GNUNET_log_skip (unsigned int n, int check_reset);
375 * @param comp default component to use
376 * @param loglevel what types of messages should be logged
377 * @param logfile change logging to logfile (use NULL to keep stderr)
378 * @return GNUNET_OK on success, GNUNET_SYSERR if logfile could not be opened
381 GNUNET_log_setup (const char *comp, const char *loglevel, const char *logfile);
385 * Add a custom logger.
387 * @param logger log function
388 * @param logger_cls closure for logger
391 GNUNET_logger_add (GNUNET_Logger logger, void *logger_cls);
395 * Remove a custom logger.
397 * @param logger log function
398 * @param logger_cls closure for logger
401 GNUNET_logger_remove (GNUNET_Logger logger, void *logger_cls);
405 * Convert a hash value to a string (for printing debug messages).
406 * This is one of the very few calls in the entire API that is
409 * @param hc the hash code
413 GNUNET_h2s (const GNUNET_HashCode * hc);
417 * Convert a hash value to a string (for printing debug messages).
418 * This prints all 104 characters of a hashcode!
419 * This is one of the very few calls in the entire API that is
422 * @param hc the hash code
426 GNUNET_h2s_full (const GNUNET_HashCode * hc);
430 * Convert a peer identity to a string (for printing debug messages).
431 * This is one of the very few calls in the entire API that is
434 * @param pid the peer identity
435 * @return string form of the pid; will be overwritten by next
436 * call to GNUNET_i2s.
439 GNUNET_i2s (const struct GNUNET_PeerIdentity *pid);
443 * Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string
444 * (for printing debug messages). This is one of the very few calls
445 * in the entire API that is NOT reentrant!
447 * @param addr the address
448 * @param addrlen the length of the address
449 * @return nicely formatted string for the address
450 * will be overwritten by next call to GNUNET_a2s.
453 GNUNET_a2s (const struct sockaddr *addr, socklen_t addrlen);
456 * Convert error type to string.
458 * @param kind type to convert
459 * @return string corresponding to the type
462 GNUNET_error_type_to_string (enum GNUNET_ErrorType kind);
466 * Use this for fatal errors that cannot be handled
468 #define GNUNET_assert(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); GNUNET_abort(); } } while(0)
471 * Use this for fatal errors that cannot be handled
473 #define GNUNET_assert_at(cond, f, l) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), f, l); GNUNET_abort(); } } while(0)
476 * Use this for internal assertion violations that are
477 * not fatal (can be handled) but should not occur.
479 #define GNUNET_break(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("Assertion failed at %s:%d.\n"), __FILE__, __LINE__); } } while(0)
482 * Use this for assertion violations caused by other
483 * peers (i.e. protocol violations). We do not want to
484 * confuse end-users (say, some other peer runs an
485 * older, broken or incompatible GNUnet version), but
486 * we still want to see these problems during
487 * development and testing. "OP == other peer".
489 #define GNUNET_break_op(cond) do { if (! (cond)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK, _("External protocol violation detected at %s:%d.\n"), __FILE__, __LINE__); } } while(0)
492 * Log an error message at log-level 'level' that indicates
493 * a failure of the command 'cmd' with the message given
494 * by strerror(errno).
496 #define GNUNET_log_strerror(level, cmd) do { GNUNET_log(level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, STRERROR(errno)); } while(0)
499 * Log an error message at log-level 'level' that indicates
500 * a failure of the command 'cmd' with the message given
501 * by strerror(errno).
503 #define GNUNET_log_from_strerror(level, component, cmd) do { GNUNET_log_from (level, component, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, STRERROR(errno)); } while(0)
506 * Log an error message at log-level 'level' that indicates
507 * a failure of the command 'cmd' with the message given
508 * by strerror(errno).
510 #define GNUNET_log_strerror_file(level, cmd, filename) do { GNUNET_log(level, _("`%s' failed on file `%s' at %s:%d with error: %s\n"), cmd, filename,__FILE__, __LINE__, STRERROR(errno)); } while(0)
513 * Log an error message at log-level 'level' that indicates
514 * a failure of the command 'cmd' with the message given
515 * by strerror(errno).
517 #define GNUNET_log_from_strerror_file(level, component, cmd, filename) do { GNUNET_log_from (level, component, _("`%s' failed on file `%s' at %s:%d with error: %s\n"), cmd, filename,__FILE__, __LINE__, STRERROR(errno)); } while(0)
519 /* ************************* endianess conversion ****************** */
522 * Convert unsigned 64-bit integer to host-byte-order.
523 * @param n the value in network byte order
524 * @return the same value in host byte order
527 GNUNET_ntohll (uint64_t n);
530 * Convert unsigned 64-bit integer to network-byte-order.
531 * @param n the value in host byte order
532 * @return the same value in network byte order
535 GNUNET_htonll (uint64_t n);
538 * Convert double to network-byte-order.
539 * @param d the value in network byte order
540 * @return the same value in host byte order
543 GNUNET_hton_double (double d);
546 * Convert double to host-byte-order
547 * @param d the value in network byte order
548 * @return the same value in host byte order
551 GNUNET_ntoh_double (double d);
553 /* ************************* allocation functions ****************** */
556 * Maximum allocation with GNUNET_malloc macro.
558 #define GNUNET_MAX_MALLOC_CHECKED (1024 * 1024 * 40)
561 * Wrapper around malloc. Allocates size bytes of memory.
562 * The memory will be zero'ed out.
564 * @param size the number of bytes to allocate, must be
565 * smaller than 40 MB.
566 * @return pointer to size bytes of memory, never NULL (!)
568 #define GNUNET_malloc(size) GNUNET_xmalloc_(size, __FILE__, __LINE__)
571 * Allocate and initialize a block of memory.
573 * @param buf data to initalize the block with
574 * @param size the number of bytes in buf (and size of the allocation)
575 * @return pointer to size bytes of memory, never NULL (!)
577 #define GNUNET_memdup(buf,size) GNUNET_xmemdup_(buf, size, __FILE__, __LINE__)
580 * Wrapper around malloc. Allocates size bytes of memory.
581 * The memory will be zero'ed out.
583 * @param size the number of bytes to allocate
584 * @return pointer to size bytes of memory, NULL if we do not have enough memory
586 #define GNUNET_malloc_large(size) GNUNET_xmalloc_unchecked_(size, __FILE__, __LINE__)
589 * Wrapper around realloc. Rellocates size bytes of memory.
591 * @param ptr the pointer to reallocate
592 * @param size the number of bytes to reallocate
593 * @return pointer to size bytes of memory
595 #define GNUNET_realloc(ptr, size) GNUNET_xrealloc_(ptr, size, __FILE__, __LINE__)
598 * Wrapper around free. Frees the memory referred to by ptr.
599 * Note that is is generally better to free memory that was
600 * allocated with GNUNET_array_grow using GNUNET_array_grow(mem, size, 0) instead of GNUNET_free.
602 * @param ptr location where to free the memory. ptr must have
603 * been returned by GNUNET_strdup, GNUNET_strndup, GNUNET_malloc or GNUNET_array_grow earlier.
605 #define GNUNET_free(ptr) GNUNET_xfree_(ptr, __FILE__, __LINE__)
608 * Free the memory pointed to by ptr if ptr is not NULL.
609 * Equivalent to if (ptr!=null)GNUNET_free(ptr).
611 * @param ptr the location in memory to free
613 #define GNUNET_free_non_null(ptr) do { void * __x__ = ptr; if (__x__ != NULL) { GNUNET_free(__x__); } } while(0)
616 * Wrapper around GNUNET_strdup. Makes a copy of the zero-terminated string
619 * @param a pointer to a zero-terminated string
620 * @return a copy of the string including zero-termination
622 #define GNUNET_strdup(a) GNUNET_xstrdup_(a,__FILE__,__LINE__)
625 * Wrapper around GNUNET_strndup. Makes a partial copy of the string
628 * @param a pointer to a string
629 * @param length of the string to duplicate
630 * @return a partial copy of the string including zero-termination
632 #define GNUNET_strndup(a,length) GNUNET_xstrndup_(a,length,__FILE__,__LINE__)
635 * Grow a well-typed (!) array. This is a convenience
636 * method to grow a vector <tt>arr</tt> of size <tt>size</tt>
637 * to the new (target) size <tt>tsize</tt>.
640 * Example (simple, well-typed stack):
643 * static struct foo * myVector = NULL;
644 * static int myVecLen = 0;
646 * static void push(struct foo * elem) {
647 * GNUNET_array_grow(myVector, myVecLen, myVecLen+1);
648 * memcpy(&myVector[myVecLen-1], elem, sizeof(struct foo));
651 * static void pop(struct foo * elem) {
652 * if (myVecLen == 0) die();
653 * memcpy(elem, myVector[myVecLen-1], sizeof(struct foo));
654 * GNUNET_array_grow(myVector, myVecLen, myVecLen-1);
658 * @param arr base-pointer of the vector, may be NULL if size is 0;
659 * will be updated to reflect the new address. The TYPE of
660 * arr is important since size is the number of elements and
661 * not the size in bytes
662 * @param size the number of elements in the existing vector (number
663 * of elements to copy over)
664 * @param tsize the target size for the resulting vector, use 0 to
665 * free the vector (then, arr will be NULL afterwards).
667 #define GNUNET_array_grow(arr,size,tsize) GNUNET_xgrow_((void**)&arr, sizeof(arr[0]), &size, tsize, __FILE__, __LINE__)
670 * Append an element to a list (growing the
673 #define GNUNET_array_append(arr,size,element) do { GNUNET_array_grow(arr,size,size+1); arr[size-1] = element; } while(0)
676 * Like snprintf, just aborts if the buffer is of insufficient size.
678 * @param buf pointer to buffer that is written to
679 * @param size number of bytes in buf
680 * @param format format strings
681 * @param ... data for format string
682 * @return number of bytes written to buf or negative value on error
685 GNUNET_snprintf (char *buf, size_t size, const char *format, ...);
689 * Like asprintf, just portable.
691 * @param buf set to a buffer of sufficient size (allocated, caller must free)
692 * @param format format string (see printf, fprintf, etc.)
693 * @param ... data for format string
694 * @return number of bytes in "*buf" excluding 0-termination
697 GNUNET_asprintf (char **buf, const char *format, ...);
700 /* ************** internal implementations, use macros above! ************** */
703 * Allocate memory. Checks the return value, aborts if no more
704 * memory is available. Don't use GNUNET_xmalloc_ directly. Use the
705 * GNUNET_malloc macro.
706 * The memory will be zero'ed out.
708 * @param size number of bytes to allocate
709 * @param filename where is this call being made (for debugging)
710 * @param linenumber line where this call is being made (for debugging)
711 * @return allocated memory, never NULL
714 GNUNET_xmalloc_ (size_t size, const char *filename, int linenumber);
718 * Allocate and initialize memory. Checks the return value, aborts if no more
719 * memory is available. Don't use GNUNET_xmemdup_ directly. Use the
720 * GNUNET_memdup macro.
722 * @param buf buffer to initialize from (must contain size bytes)
723 * @param size number of bytes to allocate
724 * @param filename where is this call being made (for debugging)
725 * @param linenumber line where this call is being made (for debugging)
726 * @return allocated memory, never NULL
729 GNUNET_xmemdup_ (const void *buf, size_t size, const char *filename,
734 * Allocate memory. This function does not check if the allocation
735 * request is within reasonable bounds, allowing allocations larger
736 * than 40 MB. If you don't expect the possibility of very large
737 * allocations, use GNUNET_malloc instead. The memory will be zero'ed
740 * @param size number of bytes to allocate
741 * @param filename where is this call being made (for debugging)
742 * @param linenumber line where this call is being made (for debugging)
743 * @return pointer to size bytes of memory, NULL if we do not have enough memory
746 GNUNET_xmalloc_unchecked_ (size_t size, const char *filename, int linenumber);
749 * Reallocate memory. Checks the return value, aborts if no more
750 * memory is available.
753 GNUNET_xrealloc_ (void *ptr, size_t n, const char *filename, int linenumber);
756 * Free memory. Merely a wrapper for the case that we
757 * want to keep track of allocations. Don't use GNUNET_xfree_
758 * directly. Use the GNUNET_free macro.
760 * @param ptr pointer to memory to free
761 * @param filename where is this call being made (for debugging)
762 * @param linenumber line where this call is being made (for debugging)
765 GNUNET_xfree_ (void *ptr, const char *filename, int linenumber);
769 * Dup a string. Don't call GNUNET_xstrdup_ directly. Use the GNUNET_strdup macro.
770 * @param str string to duplicate
771 * @param filename where is this call being made (for debugging)
772 * @param linenumber line where this call is being made (for debugging)
773 * @return the duplicated string
776 GNUNET_xstrdup_ (const char *str, const char *filename, int linenumber);
779 * Dup partially a string. Don't call GNUNET_xstrndup_ directly. Use the GNUNET_strndup macro.
781 * @param str string to duplicate
782 * @param len length of the string to duplicate
783 * @param filename where is this call being made (for debugging)
784 * @param linenumber line where this call is being made (for debugging)
785 * @return the duplicated string
788 GNUNET_xstrndup_ (const char *str, size_t len, const char *filename,
792 * Grow an array, the new elements are zeroed out.
793 * Grows old by (*oldCount-newCount)*elementSize
794 * bytes and sets *oldCount to newCount.
796 * Don't call GNUNET_xgrow_ directly. Use the GNUNET_array_grow macro.
798 * @param old address of the pointer to the array
800 * @param elementSize the size of the elements of the array
801 * @param oldCount address of the number of elements in the *old array
802 * @param newCount number of elements in the new array, may be 0 (then *old will be NULL afterwards)
803 * @param filename where is this call being made (for debugging)
804 * @param linenumber line where this call is being made (for debugging)
807 GNUNET_xgrow_ (void **old, size_t elementSize, unsigned int *oldCount,
808 unsigned int newCount, const char *filename, int linenumber);
812 * Create a copy of the given message.
814 * @param msg message to copy
815 * @return duplicate of the message
817 struct GNUNET_MessageHeader *
818 GNUNET_copy_message (const struct GNUNET_MessageHeader *msg);
821 #if __STDC_VERSION__ < 199901L
823 #define __func__ __FUNCTION__
825 #define __func__ "<unknown>"
829 #endif /*GNUNET_COMMON_H_ */