---
name: "syscallbysysc.d"
section: "1m"
platform: "macos"
package: "dtrace"
version: "413"
release: "macOS 26.5"
platforms: ["macos"]
url: "https://new.carta.tech/syscallbysysc.d"
---

# syscallbysysc.d(1m)

syscalls by syscall. Uses DTrace.

## NAME

syscallbysysc.d - syscalls by syscall. Uses DTrace.

## SYNOPSIS

**syscallbysysc.d**

## DESCRIPTION

syscallbysysc.d is a DTrace OneLiner to a report of the number of  each type of system call made.

This is useful to identify which system call is the most common.

Docs/oneliners.txt and Docs/Examples/oneliners\_examples.txt in the DTraceToolkit contain this as a oneliner that can be cut-n-paste to run.

Since this uses DTrace, only users with root privileges can run this command.

## EXAMPLES

- This samples until Ctrl-C is hit.

  \#  **syscallbysysc.d**

## FIELDS

- first field

  This is the system call type. Most have man pages in section 2.

- second field

  This is the count, the number of occurrances for this system call.

## DOCUMENTATION

See the DTraceToolkit for further documentation under the  Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output.

## EXIT

syscallbysysc.d will sample until Ctrl-C is hit.

## AUTHOR

Brendan Gregg \[Sydney, Australia\]

## SEE ALSO

procsystime(1M), dtrace(1M), [truss(1)](/truss/1.md)