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| tan Subroutine | Computes the trigonometric functions. |
| tanh Subroutine | Computes hyperbolic functions. |
| tanhl Subroutine | Computes hyperbolic functions. |
| tanl Subroutine | Computes the trigonometric functions. |
| tcb Subroutine | Alters the Trusted Computing Base (TCB) status of a file. |
| tcdrain Subroutine | Waits for output to complete. |
| tcflow Subroutine | Performs flow control functions. |
| tcflush Subroutine | Discards data from the specified queue. |
| tcgetattr Subroutine | Gets terminal state. |
| tcgetpgrp Subroutine | Gets foreground process group ID. |
| tcsendbreak Subroutine | Sends a break on an asynchronous serial data line. |
| tcsetattr Subroutine | Sets terminal state. |
| tcsetpgrp Subroutine | Sets foreground process group ID. |
| tdelete Subroutine | Manages binary search trees. |
| telldir Subroutine | Performs operations on directories. |
| tempnam Subroutine | Constructs the name for a temporary file. |
| termdef Subroutine | Queries terminal characteristics. |
| tfind Subroutine | Manages binary search trees. |
| tgetent Subroutine | Termcap database emulation. |
| tgetflag Subroutine | Termcap database emulation. |
| tgetnum Subroutine | Termcap database emulation. |
| tgetstr Subroutine | Termcap database emulation. |
| tgoto Subroutine | Termcap database emulation. |
| thread_self Subroutine | Returns the caller's kernel thread ID. |
| thread_setsched Subroutine | Changes the scheduling policy and priority of a kernel thread. |
| tigetflag Subroutine | Retrieves capabilities from the terminfo database. |
| tigetnum Subroutine | Retrieves capabilities from the terminfo database. |
| tigetstr Subroutine | Retrieves capabilities from the terminfo database. |
| time Subroutine | Gets or sets the current value for the specified systemwide timer. |
| time_base_to_time Subroutine | Read the processor real time clock or time base registers to obtain high-resolution elapsed time. |
| timeout Subroutine | Controls blocking on input. |
| times Subroutine | Displays information about resource use. |
| timezone Subroutine | Returns the name of the timezone associated with the first argument. |
| tmpfile Subroutine | Creates a temporary file. |
| tmpnam Subroutine | Constructs the name for a temporary file. |
| tolower Subroutine | Translates characters. |
| touchline Subroutine | Window refresh control functions. |
| touchoverlap Subroutine | Marks the overlap of two windows as changed and makes arrangements for their refresh. |
| touchwin Subroutine | Window refresh control functions. |
| touchwin Subroutine | Forces every character in a window's buffer to be refreshed at the next call to the wrefresh subroutine. |
| toupper Subroutine | Translates characters. |
| towctrans Subroutine | Character transliteration. |
| towlower Subroutine | Converts an uppercase wide character to a lowercase wide character. |
| towupper Subroutine | Converts a lowercase wide character to an uppercase wide character. |
| tparm Subroutine | Retrieves capabilities from the terminfo database. |
| tparm Subroutine | Applies parameters (padding) to a terminal capability. |
| tputs Subroutine | Outputs commands to the terminal. |
| trcgen Subroutine | Records a trace event for a generic trace channel. |
| trcgent Subroutine | Records a trace event for a generic trace channel. |
| trchook Subroutine | Records a trace event. |
| trcoff Subroutine | Halts the collection of trace data from within a process. |
| trcon Subroutine | Starts the collection of trace data. |
| trcstart Subroutine | Starts a trace session. |
| trcstop Subroutine | Stops a trace session. |
| t_rcvreldata Subroutine | Receive an orderly release indication or confirmation containing user data. |
| t_rcvv Subroutine | Receive data or expedited data sent over a connection and put the data into one or more non-contiguous buffers. |
| t_rcvvudata Subroutine | Receive a data unit into one or more noncontiguous buffers. |
| trunc Subroutine | Rounds floating-point numbers to floating-point integer values. |
| truncate Subroutine | Changes the length of regular files. |
| truncate64 Subroutine | Changes the length of regular files. |
| tsearch Subroutine | Manages binary search trees. |
| t_sndreldata Subroutine | Initiate/respond to an orderly release with user data. |
| t_sndv Subroutine | Send data or expedited data, from one or more non-contiguous buffers, on a connection. |
| t_sndvudata Subroutine | Send a data unit from one or more noncontiguous buffers. |
| t_sysconf Subroutine | Get configurable XTI variables. |
| ttylock Subroutine | Controls tty locking functions. |
| ttylocked Subroutine | Controls tty locking functions. |
| ttyname Subroutine | Gets the name of a terminal or determines if the device is a terminal. |
| ttyslot Subroutine | Finds the slot in the utmp file for the current user. |
| ttyunlock Subroutine | Controls tty locking functions. |
| ttywait Subroutine | Controls tty locking functions. |
| twalk Subroutine | Manages binary search trees. |
| typeahead Subroutine | Controls checking for typeahead. |
| tzset Subroutine | Converts the formats of date and time representations. |
| ualarm Subroutine | Manipulates the expiration time of interval timers. |
| uitrunc Subroutine | Rounds floating-point numbers to unsigned integers. |
| ulimit Subroutine | Sets and gets user limits. |
| umask Subroutine | Sets and gets the value of the file creation mask. |
| umount Subroutine | Removes a virtual file system from the file tree. |
| umul_dbl Subroutine | Computes absolute value, division, and double precision multiplication of integers. |
| uname Subroutine | Gets the name of the current operating system. |
| unamex Subroutine | Gets the name of the current operating system. |
| unctrl Subroutine | Generates a printable representation of a character. |
| ungetc Subroutine | Pushes a character back into the input stream. |
| ungetch Subroutine | Pushes a character onto the input queue. |
| ungetwc Subroutine | Pushes a character back into the input stream. |
| unget_wch Subroutine | Pushes a character onto the input queue. |
| unlink Subroutine | Removes a directory entry. |
| unload Subroutine | Unloads a module. |
| unlockpt Subroutine | Unlocks a pseudo-terminal device. |
| unordered Subroutine | Determines classifications of floating-point numbers. |
| untouchwin Subroutine | Window refresh control functions. |
| usleep Subroutine | Suspends a current process from execution. |
| usrinfo Subroutine | Gets and sets user information about the owner of the current process. |
| ustat Subroutine | Gets file system statistics. |
| utime Subroutine | Sets file-access and modification times. |
| utimes Subroutine | Sets file-access and modification times. |
| utmpname Subroutine | Accesses utmp file entries. |
| utrchook Subroutine | Records a trace event. |
| uvmount Subroutine | Removes a virtual file system from the file tree. |
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