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bzero(3c)
Standard C Library Functions bstring(3C)
NAME
bstring, bcopy, bcmp, bzero, explicit_bzero - memory operations
SYNOPSIS
#include <strings.h>
void bcopy(const void *s1, void *s2, size_t n);
int bcmp(const void *s1, const void *s2, size_t n);
void bzero(void *s, size_t n);
void explicit_bzero(void *s, size_t n);
DESCRIPTION
The bcopy(), bcmp(), bzero(), and explicit_bzero() functions operate as
efficiently as possible on memory areas (arrays of bytes bounded by a
count, not terminated by a null character). They do not check for the
overflow of any receiving memory area. These functions are similar to
the memcpy(), memcmp(), memset(), and explicit_memset() functions
described on the memory(3C) manual page.
The bcopy() function copies n bytes from memory area s1 to s2. Copying
between objects that overlap will take place correctly.
The bcmp() function compares the first n bytes of its arguments,
returning 0 if they are identical and 1 otherwise. The bcmp() function
always returns 0 when n is 0.
The bzero() function sets the first n bytes in memory area s to 0.
The explicit_bzero() function performs the same operation as bzero().
It differs from bzero() in that it will not be removed by compiler dead
store analysis. The explicit_bzero() function is useful for clearing no
longer needed sensitive data to ensure that it does not remain accessi‐
ble in process memory.
WARNINGS
The bcopy() function takes parameters backwards from memcpy(). See mem‐
ory(3C).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee standards(7).
SEE ALSO
timingsafe_bcmp(3C), memory(3C), attributes(7), standards(7)
Oracle Solaris 11.4 16 April 2019 bstring(3C)