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Obtains errno from the return value of a system function call.
For some systems this will obtain the value directly from the syscall return value; for others it will use a thread-local errno variable. Therefore, this function only returns a well-defined value when it is called directly after the system function call whose errno value is intended to be observed.
Obtains errno from the return value of a system function call.
For some systems this will obtain the value directly from the syscall return value; for others it will use a thread-local errno variable. Therefore, this function only returns a well-defined value when it is called directly after the system function call whose errno value is intended to be observed.