/usr/include/x86_64-linux-musl/errno.h is in musl-dev 0.9.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #ifndef _ERRNO_H
#define _ERRNO_H
#ifdef __cplusplus
extern "C" {
#endif
#include <features.h>
#include <bits/errno.h>
#ifdef __GNUC__
__attribute__((const))
#endif
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
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