llvm-project

3d6b79fc - [libc] Create syslog.h header and add several symbolic constants. (#216776)

[libc] Create syslog.h header and add several symbolic constants. (#216776) Add the `<syslog.h>` public header. For now, just define the constants used for options/priority for `openlog` and for severity in `syslog` functions, but don't implement the functions yet (some client code uses these constants in a different, application-specific context, without relying on OS-level syslog facilities). Since the values of all `LOG_` macros are identical across POSIX systems, we can define them in a shared llvm-libc-macros/syslog-macros.h file instead of using OS-specific ones. Assisted by Gemini, human-reviewed.