trace_logf()

Insert a user string trace event

Synopsis:

#include <sys/neutrino.h>
#include <sys/trace.h>

int trace_logf( int code,
                const char *fmt, ...);

Arguments:

code
The event code, which must be in the range from _NTO_TRACE_USERFIRST through _NTO_TRACE_USERLAST.
fmt
A printf() -style formatting string. This must be followed by additional arguments that provide the items required by the fmt string.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The trace_logf() function calls TraceEvent() to insert a user string event of class _NTO_TRACE_USER, and of the type specified by code.

Returns:

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

Errors:

ECANCELED
The requested action has been canceled.
EFAULT
Bad internal trace buffer address. The requested action has been specified out of order.
ENOMEM
Insufficient memory to allocate the trace buffers.
ENOTSUP
The requested action isn't supported.
EPERM
The application doesn't have permission to perform the action.

Classification:

QNX Neutrino

Safety:  
Cancellation point No
Interrupt handler Read the Caveats
Signal handler Yes
Thread Yes

Caveats:

It isn't safe to call this function from an interrupt handler if the formatting codes or parameters include floating-point elements.

Last modified: 2013-12-23

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