dtrace_syscall4
A dtrace provider for system calls
Usage
syscall:abi:syscall:entry
syscall:abi:syscall:return
Overview
The syscall provider provides entry and return probes for system calls.
The module in the probe's description is abi, which indicates what system call ABI a syscall belongs to. dtrace_syscall supports the following system call ABIs:
freebsd-
Native ABI.
freebsd32-
Non-native, 32-bit ABI.
linux-
Refer to linux(4).
linux32-
Refer to linux(4).
The arguments to the entry probes are the arguments passed to the system call.
The return probe stores the system call's return value in both arg0 and arg1.
Inspect the d(7)'s errno variable to check if a system call failed.
Examples
Example 1 : Count Up System Calls
The following script traces all system calls and counts them for every process on the system.
syscall:::entry {
@[execname, pid] = count();
}