| USRP Hardware Driver and USRP Manual Version: 4.9.0.makepkg-0-g9ec1f582 UHD and USRP Manual |

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subdev_spec.h File Reference
`#include <uhd/config.h>`
`#include <uhd/error.h>`
`#include <stdbool.h>`

Go to the source code of this file.

## Classes
struct | uhd_subdev_spec_pair_t
| Subdevice specification. More...

## Typedefs
typedef struct uhd_subdev_spec_t * | uhd_subdev_spec_handle
| A C-level interface for working with a list of subdevice specifications.

## Functions
UHD_API uhd_error | uhd_subdev_spec_pair_free (uhd_subdev_spec_pair_t *subdev_spec_pair)
| Safely destroy any memory created in the generation of a uhd_subdev_spec_pair_t.
UHD_API uhd_error | uhd_subdev_spec_pairs_equal (const uhd_subdev_spec_pair_t *first, const uhd_subdev_spec_pair_t *second, bool *result_out)
| Check to see if two subdevice specifications are equal.
UHD_API uhd_error | uhd_subdev_spec_make (uhd_subdev_spec_handle *h, const char *markup)
| Create a handle for a list of subdevice specifications.
UHD_API uhd_error | uhd_subdev_spec_free (uhd_subdev_spec_handle *h)
| Safely destroy a subdevice specification handle.
UHD_API uhd_error | uhd_subdev_spec_size (uhd_subdev_spec_handle h, size_t *size_out)
| Check how many subdevice specifications are in this list.
UHD_API uhd_error | uhd_subdev_spec_push_back (uhd_subdev_spec_handle h, const char *markup)
| Add a subdevice specification to this list.
UHD_API uhd_error | uhd_subdev_spec_at (uhd_subdev_spec_handle h, size_t num, uhd_subdev_spec_pair_t *subdev_spec_pair_out)
| Get the subdevice specification at the given index.
UHD_API uhd_error | uhd_subdev_spec_to_pp_string (uhd_subdev_spec_handle h, char *pp_string_out, size_t strbuffer_len)
| Get a string representation of the given list.
UHD_API uhd_error | uhd_subdev_spec_to_string (uhd_subdev_spec_handle h, char *string_out, size_t strbuffer_len)
| Get a markup string representation of the given list.
UHD_API uhd_error | uhd_subdev_spec_last_error (uhd_subdev_spec_handle h, char *error_out, size_t strbuffer_len)
| Get the last error recorded by the given handle.

## Typedef Documentation

## ◆ uhd_subdev_spec_handle

typedef struct uhd_subdev_spec_t* uhd_subdev_spec_handle

A C-level interface for working with a list of subdevice specifications.

See uhd::usrp::subdev_spec_t for more details.

NOTE: Using a handle before passing it into uhd_subdev_spec_make() will result in undefined behavior.

## Function Documentation

## ◆ uhd_subdev_spec_at()

UHD_API uhd_error uhd_subdev_spec_at | ( | uhd_subdev_spec_handle | h,
|  | size_t | num,
|  | uhd_subdev_spec_pair_t * | subdev_spec_pair_out )

Get the subdevice specification at the given index.

## ◆ uhd_subdev_spec_free()

UHD_API uhd_error uhd_subdev_spec_free | ( | uhd_subdev_spec_handle * | h | ) |

Safely destroy a subdevice specification handle.

NOTE: Using a handle after passing it into this function will result in a segmentation fault.

## ◆ uhd_subdev_spec_last_error()

UHD_API uhd_error uhd_subdev_spec_last_error | ( | uhd_subdev_spec_handle | h,
|  | char * | error_out,
|  | size_t | strbuffer_len )

Get the last error recorded by the given handle.

## ◆ uhd_subdev_spec_make()

UHD_API uhd_error uhd_subdev_spec_make | ( | uhd_subdev_spec_handle * | h,
|  | const char * | markup )

Create a handle for a list of subdevice specifications.

## ◆ uhd_subdev_spec_pair_free()

UHD_API uhd_error uhd_subdev_spec_pair_free | ( | uhd_subdev_spec_pair_t * | subdev_spec_pair | ) |

Safely destroy any memory created in the generation of a uhd_subdev_spec_pair_t.

## ◆ uhd_subdev_spec_pairs_equal()

UHD_API uhd_error uhd_subdev_spec_pairs_equal | ( | const uhd_subdev_spec_pair_t * | first,
|  | const uhd_subdev_spec_pair_t * | second,
|  | bool * | result_out )

Check to see if two subdevice specifications are equal.

## ◆ uhd_subdev_spec_push_back()

UHD_API uhd_error uhd_subdev_spec_push_back | ( | uhd_subdev_spec_handle | h,
|  | const char * | markup )

Add a subdevice specification to this list.

## ◆ uhd_subdev_spec_size()

UHD_API uhd_error uhd_subdev_spec_size | ( | uhd_subdev_spec_handle | h,
|  | size_t * | size_out )

Check how many subdevice specifications are in this list.

## ◆ uhd_subdev_spec_to_pp_string()

UHD_API uhd_error uhd_subdev_spec_to_pp_string | ( | uhd_subdev_spec_handle | h,
|  | char * | pp_string_out,
|  | size_t | strbuffer_len )

Get a string representation of the given list.

## ◆ uhd_subdev_spec_to_string()

UHD_API uhd_error uhd_subdev_spec_to_string | ( | uhd_subdev_spec_handle | h,
|  | char * | string_out,
|  | size_t | strbuffer_len )

Get a markup string representation of the given list.