/usr/include/diet/sys/uio.h is in dietlibc-dev 0.33~cvs20120325-4.
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 | #ifndef _SYS_UIO
#define _SYS_UIO 1
#include <sys/socket.h>
__BEGIN_DECLS
/* I have no idea why susv3 specifies count as int instead of size_t */
ssize_t readv(int filedes, const struct iovec *vector, int count);
ssize_t writev(int filedes, const struct iovec *vector, int count);
__END_DECLS
#endif
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