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#define _GNU_SOURCE /* See feature_test_macros(7) */
void *memfrob(void *s, size_t n);
The memfrob() function encrypts the first n bytes of the memory area s
by exclusive-ORing each character with the number 42. The effect can
be reversed by using memfrob() on the encrypted memory area.
Note that this function is not a proper encryption routine as the XOR
constant is fixed, and is suitable only for hiding strings.
The memfrob() function returns a pointer to the encrypted memory area.
Multithreading (see pthreads(7))
The memfrob() function is thread-safe.
The memfrob() function is unique to the GNU C Library.
GNU 2014-03-17 MEMFROB(3)