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#ifndef _ERRNO_H #define _ERRNO_H #ifdef __cplusplus extern "C" { #endif #include <features.h> #include <bits/errno.h> int *__errno_location(void); #define errno (*__errno_location()) #ifdef _GNU_SOURCE extern char *program_invocation_short_name, *program_invocation_name; #endif #ifdef __cplusplus } #endif #endif