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The strace command lets you observe a given process in detail, printing its system calls as they occur. It expands all arguments, return values, and errors (if any) for the system calls, showing all information passed between the process and the kernel. (It can also trace signals.)

To attach strace to a running process, we can use the flag -p followed by the PID.

It is used to monitor and tamper with interactions between processes and the Linux kernel, which include system calls, signal deliveries, and changes of process state. The operation of strace is made possible by the kernel feature known as ptrace.

If a process is already running, you can trace it by simply passing its PID as follows; this will fill your screen with continues output that shows system calls being made by the process, to end it, press [Ctrl + C] . $ sudo strace -p 3569 strace: Process 3569 attached restart_syscall(<...

Trace Linux Command System Calls You can simply run a command with strace like this, here we are tracing of all system calls made by the df command. $ strace df -h execve("/bin/df", ["df", "-h"], [/* 50 vars */]) = 0 brk(NULL) = 0x136e000 access("/etc/ld.

The command strace is used to trace system calls and signals. It is a great tool to use when debugging an application and is often requested by Red Hat support engineers to examine certain issues which may arise within the operating system and its programs.

The command strace is used to trace system calls and signals. It is a great tool to use when debugging an application and is often requested by Red Hat support engineers to examine certain issues which may arise within the operating system and its programs.