This is strace - a diagnostic, debugging and instructional userspace utility with a traditional command-line interface for Linux. 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. strace is released under the terms of the GNU Lesser General Public License version 2.1 or later; see the file COPYING for details. strace test suite is released under the terms of the GNU General Public License version 2 or later; see the file tests/COPYING for details. See the file CREDITS for a list of authors and other contributors. See the file INSTALL for compilation and installation instructions. See the file NEWS for information on what has changed in recent versions. See the file README-hacking for information related to strace development. The project's homepage is at https://strace.io The GIT repository of strace is available at https://github.com/strace/strace/ and https://gitlab.com/strace/strace/ strace has a mailing list: strace-devel@lists.strace.io Everyone is welcome to post bug reports, feature requests, comments and patches to the list. The mailing list archives are available at https://lists.strace.io/pipermail/strace-devel/ System requirements: * Linux kernel >= 2.6.18 is recommended. Older versions might still work but they haven't been thoroughly tested with this release. * Linux kernel >= 2.5.46 is required. Older versions without a decent PTRACE_SETOPTIONS support will not work. * On mips, Linux kernel >= 2.6.15 is required. Older versions without a decent PTRACE_GETREGS support will not work. * On s390 and s390x, Linux kernel >= 2.6.27 is required. Older versions without a decent PTRACE_GETREGSET support will not work.