size_t(3type) - BetterMan

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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].
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.
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>.

NAME

size_t, ssize_t - count of bytes

Standard C library (libc)

bash

#include <stddef.h>

bash

typedef\n /* ... */  \nsize_t;

bash

#include <sys/types.h>

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typedef\n /* ... */  \nssize_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].

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).

<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>.