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HTML rendering created 2026-09-09 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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memory.h(3head) memory.h(3head)
memory.h - memory operations
Standard C library (libc, -lc)
#include <memory.h>
Write
bzero(3)
explicit_bzero(3)
memset(3)
memset_explicit(3)
Copy
memmove(3)
memcpy(3)
mempcpy(3)
memccpy(3)
strncpy(3)
stpncpy(3)
Catenate
strncat(3)
Duplicate
strndup(3)
strndupa(3)
Compare
memeq(3)
memcmp(3)
strncmp(3)
strncasecmp(3)
Search
memchr(3)
memrchr(3)
memmem(3)
In some systems (Illumos), <memory.h> contains only a few of these
functions, and thus <string.h> is needed.
BSD.
These functions are also provided in <string.h>, as specified by
ISO C. This is a historic mistake maintained for compatibility
reasons; these functions aren't string APIs.
SVr1, 4.3BSD.
System V (1983) introduced an initial set of mem* functions in a
<memory.h> header file. 4.3BSD (1986) adopted them.
SVID Issue 1 (1985) standardized this header file, but stated that
the functions would be moved to <string.h>.
XPG Issue 3 (1989) listed <memory.h> as WITHDRAWN, and stated that
the functions had been moved to <string.h>.
C89 didn't standardize this header file and instead specified all
these functions in <string.h>.
This merge of header files has historically confused programmers
about the real purpose of these functions.
Most C libraries, including the BSDs, glibc, musl, Bionic, and
Illumos continue to provide <memory.h>.
gnulib doesn't provide it, though, and instead uses <string.h>.
string(3), string_copying(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.19.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2026-09-09. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.19 2026-08-10 memory.h(3head)
Pages that refer to this page: bcopy(3), bzero(3), explicit_bzero(3), memccpy(3), memchr(3), memcmp(3), memcpy(3), memfrob(3), memmem(3), memmove(3), mempcpy(3), memrchr(3), memset(3), memset_explicit(3), stpncpy(3), string(3), strncasecmp(3), strncat(3), strncmp(3), strncpy(3), strndup(3), strndupa(3), strnlen(3), swab(3)
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HTML rendering created 2026-09-09 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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