C and C++ Libraries and Floating-Point Support Reference

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C and C++ Libraries and Floating-Point Support Reference

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The C and C++ libraries

__aeabi_errno_addr()

__default_signal_handler()

lconv structure

_membitcpybl(), _membitcpybb(), _membitcpyhl(), _m

posix_memalign()

#pragma import(_main_redirection)

__rt_errno_addr()

__rt_fp_status_addr()

__rt_heap_extend()

__rt_lib_init()

__rt_lib_shutdown()

__rt_stackheap_init()

_sys_command_string()

_sys_istty()

__user_heap_extend()

__user_heap_extent()

__user_setup_stackheap()

__vectab_stack_and_reset

Thread-safe C library functions

C library functions that are not thread-safe

Legacy function __user_initial_stackheap()

Floating-point support

_sys_istty()

ARM Compiler toolchain v5.02 for µVision ARM C and C++ Libraries and Floating-Point Support Reference

Home > The C and C++ libraries > _sys_istty()

`_sys_istty()`

Defined in rt_sys.h, this function determines if a file handle identifies a terminal.

Syntax

int _sys_istty(FILEHANDLE fh);

Usage

When a file is connected to a terminal device, this function is used to provide unbuffered behavior by default (in the absence of a call to set(v)buf) and to prohibit seeking.

Returns

The return value is one of the following values:

0: There is no interactive device.
1: There is an interactive device.
other: An error occurred.

See also

Reference

_fisatty().

Using ARM C and C++ Libraries and Floating-Point Support:

Direct semihosting C library function dependencies.

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