size_t
Section: Misc. Reference Manual Pages (3type)
Updated: 2023-02-05
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NAME
size_t, ssize_t - count of bytes
LIBRARY
Standard C library
(libc)
SYNOPSIS
#include <stddef.h>
typedef /* ... */ size_t;
#include <sys/types.h>
typedef /* ... */ ssize_t;
DESCRIPTION
- 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 al least in the range
[-1,
SSIZE_MAX].
- 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).
VERSIONS
- size_t
-
<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.
- ssize_t
-
<aio.h>,
<mqueue.h>,
and
<sys/socket.h>
define
ssize_t
since POSIX.1-2008.
STANDARDS
size_t:
C99 and later;
POSIX.1-2001 and later.
ssize_t:
POSIX.1-2001 and later.
NOTES
- 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>.
SEE ALSO
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)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- Use with printf(3) and scanf(3)
-
- VERSIONS
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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Time: 10:11:31 GMT, May 18, 2024