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dotnet cross-platform interop with C via Environment.ProcessId system call
- System call is a mechanism that allows user-level applications to request services from the operating system’s kernel.
- Environment.ProcessId retrieves the unique identifier for the current process in dotnet.
- Windows and Unix-like operating systems have different implementations for the Environment.ProcessId call.
- Windows uses DllImport to connect managed and unmanaged code, while Unix-like systems rely on Libraries.SystemNative for interop.
- During dotnet runtime build process, platform-specific implementations are substituted for Environment class.
- Interoperability between managed and unmanaged worlds in dotnet is facilitated through DllImport (or LibraryImport).
- In Unix-like systems, the libSystem.Native dynamic library bridges the gap between managed and native code.
- Platform Abstraction Layer (PAL) in dotnet enables running on multiple operating systems, providing a consistent interface.
- getpid() function in Unix-like systems retrieves the current process id.
- Each operating system implements its own version of libc, the C standard library for functions like getpid().
- POSIX API defines common APIs for Unix-like systems, while Windows uses WinAPI for system calls.
- Understanding where system calls like getpid() reside in different operating systems provides insights into low-level interop in dotnet.
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