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roadmap update
[lttv.git]
/
ltt
/
branches
/
poly
/
doc
/
developer
/
lttng-userspace-tracing.txt
diff --git
a/ltt/branches/poly/doc/developer/lttng-userspace-tracing.txt
b/ltt/branches/poly/doc/developer/lttng-userspace-tracing.txt
index 4bf221c3e0ef5fec2a53cce2ca03e85e08f4f9c4..beb56cac516239b2583a7c649ffffe1b6d701a6a 100644
(file)
--- a/
ltt/branches/poly/doc/developer/lttng-userspace-tracing.txt
+++ b/
ltt/branches/poly/doc/developer/lttng-userspace-tracing.txt
@@
-49,7
+49,7
@@
status.
My suggestion is to go for a system call, but only call it :
- when the thread starts
My suggestion is to go for a system call, but only call it :
- when the thread starts
-- when receiving a SIG
_UPDTRACING
(multithread ?)
+- when receiving a SIG
RTMIN+3
(multithread ?)
Note : save the thread ID (process ID) in the logging function and the update
handler. Use it as a comparison to check if we are a forked child thread.
Note : save the thread ID (process ID) in the logging function and the update
handler. Use it as a comparison to check if we are a forked child thread.
@@
-192,18
+192,30
@@
API :
syscall 1 :
syscall 1 :
-int update_tracing_info(void *buffer, int *active, int *filter);
+in :
+buffer : NULL means get new traces
+ non NULL means to get the information for the specified buffer
+out :
+buffer : returns the address of the trace buffer
+active : is the trace active ?
+filter : 32 bits filter mask
+return : 0 on success, 1 on error.
+
+int ltt_update(void **buffer, int *active, int *filter);
syscall 2 :
syscall 2 :
-int tracing_buffer_switch(void *buffer);
+in :
+buffer : Switch the specified buffer.
+return : 0 on success, 1 on error.
+
+int ltt_switch(void *buffer);
Signal :
Signal :
-UPD_TRACING
-Default : SIG IGNORE
+SIGRTMIN+3
(like hardware fault and expiring timer : to the thread, see p. 413 of Advances
prog. in the UNIX env.)
(like hardware fault and expiring timer : to the thread, see p. 413 of Advances
prog. in the UNIX env.)
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