memset(3) - NetBSD Manual Pages

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MEMSET(3)               NetBSD Library Functions Manual              MEMSET(3)


NAME

     memset -- write a byte to byte string


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <string.h>

     void *
     memset(void *b, int c, size_t len);


DESCRIPTION

     The memset() function writes len bytes of value c (converted to an
     unsigned char) to the string b.


RETURN VALUES

     The 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 sani-
     tize a buffer holding a cryptographic secret, use explicit_memset(3).


SEE ALSO

     bzero(3), explicit_memset(3), swab(3)


STANDARDS

     The memset() function conforms to ANSI X3.159-1989 (``ANSI C89'').

NetBSD 10.0                      June 23, 2013                     NetBSD 10.0