mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-09-04 12:41:58 +00:00
Paul Eggert
276416a1ae
The explicit_bzero function has been added to glibc. This module is intended to supports its use in GNU programs. * doc/glibc-functions/explicit_bzero.texi, lib/explicit_bzero.c: * m4/explicit_bzero.m4, modules/explicit_bzero: New files. * doc/gnulib.texi (Glibc string.h): Link to new doc. * lib/string.in.h (explicit_bzero): Declare. * m4/string_h.m4 (gl_HEADER_STRING_H_DEFAULTS): Add defaults for it. * modules/string (string.h): Substitute its vars.
30 lines
993 B
Plaintext
30 lines
993 B
Plaintext
@node explicit_bzero
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@subsection @code{explicit_bzero}
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@findex explicit_bzero
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Gnulib module: explicit_bzero
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The @code{explicit_bzero} function is an approximation to what is
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needed, and does not suffice in general to erase information.
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Although calling @code{explicit_bzero} should clear the memory in
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question, the information that was in memory may still be available
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elsewhere on the machine. Proper implementation of information
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erasure requires support from levels below C code.
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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glibc 2.24, FreeBSD 10, NetBSD 7.1, OpenBSD 5.4, macOS 10.12, Solaris 11.3,
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and many other systems.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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Although the module's implementation should clear the memory on
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platforms compatible with GCC and on platforms using traditional
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linkers, it may not clear the memory on non-GCC platforms that use
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whole-program optimization.
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@end itemize
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