NAME

memset — set bytes in memory

SYNOPSIS

#include <string.h>

void *memset(void *s, int c, size_t n);


DESCRIPTION

^[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.

The memset() function shall copy c (converted to an unsigned char) into each of the first n bytes of the object pointed to by s.

^[CX] The memset() function shall not change the setting of errno on valid input.

RETURN VALUE

The memset() function shall return s; no return value is reserved to indicate an error.

ERRORS

No errors are defined.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

XBD <string.h>

CHANGE HISTORY

First released in Issue 1. Derived from Issue 1 of the SVID.

Issue 8

Austin Group Defect 448 is applied, adding a requirement that memset() does not change the setting of errno on valid input.