Package libc provides run time support for programs generated by the ccgo C to Go transpiler, version 4 or later. Many C libc functions are not thread safe. Such functions are not safe for concurrent use by multiple goroutines in the Go translation as well. C threads are modeled as Go goroutines. Every such C thread, ie. a Go goroutine, must use its own Thread Local Storage instance implemented by the TLS type. Signal handling in translated C code is not coordinated with the Go runtime. This is probably the same as when running C code via CGo. This package synchronizes its environ with the current Go environ lazily and only once. From Linux man-pages Copyleft