MEMSET(3) Linux Programmers Manual MEMSET(3)
memset - fill memory with a constant byte
void *memset(void *s, int c, size_t n);
The memset() function fills the first n bytes of the memory area
pointed to by s with the constant byte c.
The memset() function returns a pointer to the memory area s.
SVr4, 4.3BSD, C89, C99, POSIX.1-2001.
bzero(3), swab(3), wmemset(3)
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GNU 1993-04-11 MEMSET(3)