bt_init_accessor()

Updated: October 26, 2022

Initialize a backtrace accessor

Note: The backtrace library is an unsupported feature, due to its fragility. For more information, see Backtraces in the QNX Neutrino technotes.

Synopsis:

#include <backtrace.h>

int bt_init_accessor( bt_accessor_t *acc,
                      bt_acc_type_t type, ...);

Arguments:

acc
A pointer to a bt_accessor_t structure. This is an opaque structure that holds the identity of the thread to backtrace.
type
The type of backtrace to perform; one of:
  • BT_SELF — backtrace the calling thread.
  • BT_THREAD — backtrace a specified thread in the current process.
  • BT_PROCESS — backtrace a specified thread in another process.

Additional arguments are required for BT_THREAD and BT_PROCESS, as described below.

Library:

libbacktrace

Use the -l backtrace option to qcc to link against this library.

Description:

The bt_init_accessor() function initializes the accessor with the identity of the thread to backtrace:

Note: The bt_acc_self global variable is a preinitialized accessor used to backtrace the current thread. Don't call bt_init_accessor() or bt_release_accessor() for this variable.

Returns:

0
Success.
-1
An error occurred (errno is set).

Errors:

EINVAL
The acc argument is NULL, or the type is invalid.

Classification:

QNX Neutrino

Safety:  
Cancellation point No
Interrupt handler No
Signal handler Yes
Thread Yes