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int s390_runtime_instr(int command, int signum);
The s390_runtime_instr() system call starts or stops CPU run-time
instrumentation for the calling thread.
The command argument controls whether run-time instrumentation is
started (S390_RUNTIME_INSTR_START, 1) or stopped (S390_RUN-
TIME_INSTR_STOP, 2) for the calling thread.
The signum argument specifies the number of a real-time signal. The
real-time signal is sent to the thread if the run-time instrumentation
buffer is full or if the run-time-instrumentation-halted interrupt
On success, s390_runtime_instr() returns 0 and enables the thread for
run-time instrumentation by assigning the thread a default run-time
instrumentation control block. The caller can then read and modify the
control block and start the run-time instrumentation. On error, -1 is
returned and errno is set to one of the error codes listed below.
EINVAL The value specified in command is not a valid command or the
value specified in signum is not a real-time signal number.
ENOMEM Allocating memory for the run-time instrumentation control block
The run-time instrumentation facility is not available.
This system call is available since Linux 3.7.
This Linux-specific system call is available only on the s390 architec-
ture. The run-time instrumentation facility is available beginning
with System z EC12.
Glibc does not provide a wrapper for this system call, use syscall(2)
to call it.