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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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size_t(3type) size_t(3type)
size_t, ssize_t - count of bytes
Standard C library (libc)
#include <stddef.h>
typedef /* ... */ size_t;
#include <sys/types.h>
typedef /* ... */ ssize_t;
size_t Used for a count of bytes. It is the result of the
sizeof() operator. It is an unsigned integer type capable
of storing values in the range [0, SIZE_MAX].
ssize_t
Used for a count of bytes or an error indication. It is a
signed integer type capable of storing values at least in
the range [-1, SSIZE_MAX].
Use with printf(3) and scanf(3)
size_t The length modifier for size_t for the printf(3) and the
scanf(3) families of functions is z, resulting commonly in
%zu or %zx for printing size_t values.
ssize_t
glibc and most other implementations provide a length
modifier for ssize_t for the printf(3) and the scanf(3)
families of functions, which is z; resulting commonly in
%zd or %zi for printing ssize_t values. Although z works
for ssize_t on most implementations, portable POSIX
programs should avoid using it—for example, by converting
the value to intmax_t and using its length modifier (j).
size_t C11, POSIX.1-2008.
ssize_t
POSIX.1-2008.
size_t C89, POSIX.1-2001.
ssize_t
POSIX.1-2001.
<aio.h>, <glob.h>, <grp.h>, <iconv.h>, <mqueue.h>, <pwd.h>,
<signal.h>, and <sys/socket.h> define size_t since POSIX.1-2008.
<aio.h>, <mqueue.h>, and <sys/socket.h> define ssize_t since
POSIX.1-2008.
size_t The following headers also provide size_t: <aio.h>,
<glob.h>, <grp.h>, <iconv.h>, <monetary.h>, <mqueue.h>,
<ndbm.h>, <pwd.h>, <regex.h>, <search.h>, <signal.h>,
<stdio.h>, <stdlib.h>, <string.h>, <strings.h>,
<sys/mman.h>, <sys/msg.h>, <sys/sem.h>, <sys/shm.h>,
<sys/socket.h>, <sys/types.h>, <sys/uio.h>, <time.h>,
<unistd.h>, <wchar.h>, and <wordexp.h>.
ssize_t
The following headers also provide ssize_t: <aio.h>,
<monetary.h>, <mqueue.h>, <stdio.h>, <sys/msg.h>,
<sys/socket.h>, <sys/uio.h>, and <unistd.h>.
read(2), readlink(2), readv(2), recv(2), send(2), write(2),
fread(3), fwrite(3), memcmp(3), memcpy(3), memset(3),
offsetof(3), ptrdiff_t(3type)
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-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. 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 6.9.1 2024-05-02 size_t(3type)
Pages that refer to this page: ptrdiff_t(3type)
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HTML rendering created 2024-06-26 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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