PSX
The Linux specific Go package,
"kernel.org/pub/linux/libs/security/libcap/psx", provides an API for
invoking system calls in a way that each system call is mirrored on
all OS threads of the combined Go/CGo runtime. Since the Go runtime
treats OS threads as interchangeable, a feature like this is needed to
meaningfully change process privilege (including dropping privilege)
in a Go program running on Linux. This package is required by:
"kernel.org/pub/linux/libs/security/libcap/cap"
When compiled CGO_ENABLED=0, the functionality requires go1.16+ to
build. That release of Go introduced syscall.AllThreadsSyscall*()
APIs. When compiled this way, the PSX package functions
psx.Syscall3() and psx.Syscall6() are aliased to
syscall.AllThreadsSyscall() and syscall.AllThreadsSyscall6()
respectively.
When compiled CGO_ENABLED=1, the functionality is implemented by C
code, [lib]psx, which is distributed with libcap.
The official release announcements for libcap and libpsx are on the Fully Capable site.
Like libcap/libpsx, the "psx" package is distributed with a "you
choose" License. Specifically: BSD 3-clause, or GPL2. See the License
file.
Andrew G. Morgan morgan@kernel.org