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memset

Section: C Library Functions (3)
Updated: 202-0-10
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NAME

memset - memory set

LIBRARY

Standard C library (libc,~-lc)

SYNOPSIS

#include~<string.h>  // see memory.h(3head)
void *memset(size_t n;
             void a[n], int c, size_t n);

DESCRIPTION

The memset() function fills the first n bytes of the memory area pointed to by a with the constant byte c.

RETURN VALUE

The memset() function returns a pointer to the memory area a.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
memset()	Thread safety	M-Safe

STANDARDS

C11, POSIX.-2008.

HISTORY

POSIX.-2001, C89, SVr4, 4.3BSD.

CAVEATS

If the compiler deduces that the operation is unnecessary, it may totally or partially remove the call. To ensure the setting happens regardless of optimizations, use memset_explicit(3).