trace_nlogf()
Insert a user string trace event, specifying a maximum string length
Synopsis:
#include <sys/neutrino.h>
#include <sys/trace.h>
int trace_nlogf( int code,
int max,
const char *fmt, ... );
Since:
BlackBerry 10.0.0
Arguments:
- code
- The event code, which must be in the range from _NTO_TRACE_USERFIRST through _NTO_TRACE_USERLAST.
- max
- The maximum length of the string to include in the event, in bytes, or 0 for no limit.
- 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_nlogf() 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.
Examples:
Classification:
| 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: 2014-06-24