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1 MEMSET_S(3C) Standard C Library Functions MEMSET_S(3C)
2
3 NAME
4 memset_s - copy a value to all bytes of a memory buffer
5
6 LIBRARY
7 Standard C Library (libc, -lc)
8
9 SYNOPSIS
10 #define __STDC_WANT_LIB_EXT1__ 1
11
12 #include <string.h>
13
14 errno_t
15 memset_s(void *s, rsize_t smax, int c, rsize_t n);
16
17 DESCRIPTION
18 The memset_s() function copies the value of c (converted to an unsigned
19 char) into each of the first n bytes of the memory buffer pointed to by
20 s.
21
22 Unlike the memset(3C), memset_s() is guaranteed to never be optimized
23 away by the compiler.
24
25 The memset_s() function detects the following runtime-constraint
26 violations:
27
28 1. s is a NULL pointer.
29
30 2. smax or n is greater than RSIZE_MAX.
31
32 3. n is greater than smax (buffer overflow).
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34 If runtime-constraint violation is detected, and if s and smax are valid,
35 the memset_s() function copies the value of c (converted to an unsigned
36 char) into each of the first smax bytes of the memory buffer pointed to
37 by s before calling the runtime-constraint handler.
38
39 RETURN VALUES
40 The memset_s() function returns 0 if there was no runtime-constraint
41 violation. Otherwise, a non-zero value is returned.
42
43 INTERFACE STABILITY
44 Standard
45
46 MT-LEVEL
47 Safe
48
49 SEE ALSO
50 memset(3C), set_constraint_handler(3C)
51
52 STANDARDS
53 The memset_s() function conforms to ISO/IEC 9899:2011 (``ISO C11'').
54
55 illumos August 12, 2017 illumos
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