Could someone explain what the following line, which is taken from /usr/include/errno.h, means :
extern void perror __P ((__const char* __s));
As I understand it, it means that perror is defined in an external file and
returns a void type. But what are the __P, and __const ? And why there are 2
sets of brackets, and not only 1 ?
Where does these constructs being documented ?
Thank you.
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