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/usr/include/diet/sys/uio.h is in dietlibc-dev 0.33~cvs20120325-6+deb8u1.

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#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