cerrno.h

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#pragma once
 
#include "fl/stl/noexcept.h"
 
// IWYU pragma: begin_keep
#include <errno.h>
// IWYU pragma: end_keep  // okay banned header (STL wrapper requires standard header)
// Use C header <errno.h> instead of C++ <cerrno> for AVR platform compatibility
 
// Bring errno functionality into fl:: namespace
// Note: errno is a macro that expands to a thread-local lvalue.
// Error constants (EEXIST, ENOENT, etc.) are also macros, so we access them
// directly rather than trying to redefine them (which would cause macro expansion conflicts).
 
namespace fl {
 
// Inline function to get current errno value
// Use this instead of accessing ::errno directly for cleaner code
inline int get_errno() FL_NO_EXCEPT {
    return errno;
}
 
// Inline function to set errno value
inline void set_errno(int value) FL_NO_EXCEPT {
    errno = value;
}
 
// Inline function to clear errno
inline void clear_errno() FL_NO_EXCEPT {
    errno = 0;
}
 
// Error constants are available as global macros (EEXIST, ENOENT, etc.)
// They can be used directly: if (errno == EEXIST) { ... }
// We provide them in the fl:: namespace for documentation purposes
 
// Note: We do NOT redefine these as they are macros and will cause conflicts.
// Instead, users can access them directly: EEXIST, ENOENT, etc.
// Or use qualified access if needed, though the macros are global.
 
} // namespace fl