/usr/include/x86_64-linux-musl/stdio_ext.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 27 28 29 30 31 32 33 34 | #ifndef _STDIO_EXT_H
#define _STDIO_EXT_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdio.h>
#define FSETLOCKING_QUERY 0
#define FSETLOCKING_INTERNAL 1
#define FSETLOCKING_BYCALLER 2
void _flushlbf(void);
int __fsetlocking(FILE *, int);
int __fwriting(FILE *);
int __freading(FILE *);
int __freadable(FILE *);
int __fwritable(FILE *);
int __flbf(FILE *);
size_t __fbufsize(FILE *);
size_t __fpending(FILE *);
int __fpurge(FILE *);
size_t __freadahead(FILE *);
const char *__freadptr(FILE *, size_t *);
void __freadptrinc(FILE *, size_t);
void __fseterr(FILE *);
#ifdef __cplusplus
}
#endif
#endif
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