cc_t

Type used for terminal special characters.

clock_t

Integer or real-floating type used for processor times, as defined in the ISO C standard.

clockid_t

Used for clock ID type in some timer functions.

dev_t

Arithmetic type used for device numbers.

DIR

Type representing a directory stream.

div_t

Structure type returned by the div() function.

FILE

Structure containing information about a file.

glob_t

Structure type used in pathname pattern matching.

fpos_t

Type containing all information needed to specify uniquely every position within a file.

gid_t

Integer type used for group IDs.

iconv_t

Type used for conversion descriptors.

id_t

Integer type used as a general identifier; can be used to contain at least the largest of a pid_t, uid_t, or gid_t.

ino_t

Unsigned integer type used for file serial numbers.

key_t

Arithmetic type used for XSI interprocess communication.

ldiv_t

Structure type returned by the ldiv() function.

mode_t

Integer type used for file attributes.

mqd_t

Used for message queue descriptors.

nfds_t

Integer type used for the number of file descriptors.

nlink_t

Integer type used for link counts.

off_t

Signed integer type used for file sizes.

pid_t

Signed integer type used for process and process group IDs.

pthread_attr_t

Used to identify a thread attribute object.

pthread_cond_t

Used for condition variables.

pthread_condattr_t

Used to identify a condition attribute object.

pthread_key_t

Used for thread-specific data keys.

pthread_mutex_t

Used for mutexes.

pthread_mutexattr_t

Used to identify a mutex attribute object.

pthread_once_t

Used for dynamic package initialization.

pthread_rwlock_t

Used for read-write locks.

pthread_rwlockattr_t

Used for read-write lock attributes.

pthread_t

Used to identify a thread.

ptrdiff_t

Signed integer type of the result of subtracting two pointers.

regex_t

Structure type used in regular expression matching.

regmatch_t

Structure type used in regular expression matching.

rlim_t

Unsigned integer type used for limit values, to which objects of type int and off_t can be cast without loss of value.

sem_t

Type used in performing semaphore operations.

sig_atomic_t

Integer type of an object that can be accessed as an atomic entity, even in the presence of asynchronous interrupts.

sigset_t

Integer or structure type of an object used to represent sets of signals.

size_t

Unsigned integer type used for size of objects.

speed_t

Type used for terminal baud rates.

ssize_t

Signed integer type used for a count of bytes or an error indication.

suseconds_t

Signed integer type used for time in microseconds.

tcflag_t

Type used for terminal modes.

time_t

Integer or real-floating type used for time in seconds, as defined in the ISO C standard.

timer_t

Used for timer ID returned by the timer_create() function.

uid_t

Integer type used for user IDs.

useconds_t

Unsigned integer type used for time in microseconds.

va_list

Type used for traversing variable argument lists.

wchar_t

Integer type whose range of values can represent distinct codes for all members of the largest extended character set specified by the supported locales

wctype_t

Scalar type which represents a character class descriptor.

wint_t

Integer type capable of storing any valid value of wchar_t or WEOF.

wordexp_t

Structure type used in word expansion.