/usr/include/purelibc.h is in libpurelibc-dev 0.4.1-1.
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 | #ifndef _PURELIBC_H
#define _PURELIBC_H
typedef long int (*sfun)(long int __sysno, ...);
#define PUREFLAG_STDIN (1<<STDIN_FILENO)
#define PUREFLAG_STDOUT (1<<STDOUT_FILENO)
#define PUREFLAG_STDERR (1<<STDERR_FILENO)
#define PUREFLAG_STDALL (PUREFLAG_STDIN|PUREFLAG_STDOUT|PUREFLAG_STDERR)
sfun _pure_start(sfun pure_syscall,sfun pure_socketcall,int flags);
long _pure_debug_printf(const char *format, ...);
#endif
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