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kernel.org/pub/linux/libs/security/libcap/psx
Package "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 announcement site for libcap and libpsx is:
https://sites.google.com/site/fullycapable/
Like libcap/libpsx itself, the "psx" package is distributed with a "you choose" License. Specifically: BSD three clause, or GPL2. See the License file.
Andrew G. Morgan morgan@kernel.org
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