proxy.golang.org : kernel.org/pub/linux/libs/security/libcap/psx

Package psx provides support for system calls that are run simultaneously on all threads under Linux. It supports tool chains after go1.16. Earlier toolchains had no reliable way to support this because of Bug 219478. The package works differently depending on whether or not CGO_ENABLED is 0 or 1. In the former case, psx is a low overhead wrapper for the two native go calls: syscall.AllThreadsSyscall() and syscall.AllThreadsSyscall6() introduced in go1.16. We provide this package wrapping to minimize client source code changes when compiling with or without CGo enabled. In the latter case it works via CGo wrappers for system call functions that call the C [lib]psx functions of these names. This ensures that the system calls execute simultaneously on all the threads of the Go (and CGo) combined runtime. With CGo, the psx support works in the following way: the thread that is first asked to execute the syscall does so, and determines if it succeeds or fails. If it fails, it returns immediately without attempting the syscall on other threads. If the initial attempt succeeds, however, then the runtime is stopped in order for the same system call to be performed on all the remaining threads of the runtime. Once all threads have completed the syscall, the return codes are those obtained by the first thread's invocation of the syscall. Note, there is no need to use this variant of syscall where the syscalls only read state from the kernel. However, since Go's runtime freely migrates code execution between threads, support of this type is required for any successful attempt to fully drop or modify the privilege of a running Go program under Linux. More info on how Linux privilege works and examples of using this package can be found on the Fully Capable site. WARNING: For older go toolchains (prior to go1.16), the code should mostly work as far back as go1.11. However, like support for C.setuid(), this support is fragile and may hang. See the above bug for details. Copyright (c) 2019,20,24 Andrew G. Morgan <[email protected]> The psx package is licensed with a (you choose) BSD 3-clause or GPL2. See LICENSE file for details.

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purl: pkg:golang/kernel.org/pub/linux/libs/security/libcap/psx
License: GPL-2.0
Latest release: 21 days ago
First release: almost 5 years ago
Namespace: kernel.org/pub/linux/libs/security/libcap
Dependent packages: 104
Dependent repositories: 170
Docker dependents: 269
Docker downloads: 303,532,576
Last synced: about 1 hour ago

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