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49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* Pi-hole: A black hole for Internet advertisements
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* (c) 2020 Pi-hole, LLC (https://pi-hole.net)
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* Network-wide ad blocking via your own hardware.
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*
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* FTL Engine
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* Pi-hole syscall implementation for realloc
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*
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* This file is copyright under the latest version of the EUPL.
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* Please see LICENSE file for your rights under this license. */
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#include "../FTL.h"
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//#include "syscalls.h" is implicitly done in FTL.h
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#include "../log.h"
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#undef realloc
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void __attribute__((alloc_size(2))) *FTLrealloc(void *ptr_in, const size_t size, const char * file, const char * func, const int line)
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{
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// The FTLrealloc() function changes the size of the memory block pointed to
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// by ptr to size bytes. The contents will be unchanged in the range from
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// the start of the region up to the minimum of the old and new sizes. If
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// the new size is larger than the old size, the added memory will not be
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// initialized. If ptr is NULL, then the call is equivalent to malloc(size),
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// for all values of size; if size is equal to zero, and ptr is not NULL,
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// then the call is equivalent to free(ptr). Unless ptr is NULL, it must
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// have been returned by an earlier call to malloc(), calloc() or realloc().
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// If the area pointed to was moved, a free(ptr) is done implicitly.
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void *ptr_out = NULL;
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do
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{
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errno = 0;
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ptr_out = realloc(ptr_in, size);
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}
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// Try again to allocate memory if this failed due to an interruption by
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// an incoming signal
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while(ptr_out == NULL && errno == EINTR);
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// Backup errno value
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const int _errno = errno;
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// Handle other errors than EINTR
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if(ptr_out == NULL)
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logg("FATAL: Memory reallocation (%p -> %zu) failed in %s() (%s:%i)",
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ptr_in, size, func, file, line);
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// Restore errno value
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errno = _errno;
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return ptr_out;
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} |