| MEMSET(3) | Library Functions Manual | MEMSET(3) | 
memset —
#include <string.h>
void *
  
  memset(void
    *b, int c,
    size_t len);
memset() function writes len
  bytes of value c (converted to an unsigned char) to the
  string b.
memset() function returns the original value of
  b.
Note that the compiler may optimize away a call to
    memset() if it can prove that the string will not be
    used by the program again, for example if it is allocated on the stack and
    about to go out of scope. If you want to guarantee that zeros are written to
    memory, for example to sanitize a buffer holding a cryptographic secret, use
    explicit_memset(3).
memset() function conforms to ANSI
  X3.159-1989 (“ANSI C89”).
| June 23, 2013 | NetBSD 9.4 |