#include <sys/uio.h>int uwritec(uio_t *uio_p);
Architecture independent level 1 (DDI/DKI).
Pointer to the uio(9S) structure.
uwritec() returns a character from the uio structure pointed to by uio_p and updates the uio structure as for uiomove(9F).
The next character for processing is returned on success, and -1 is returned if uio is empty or there is an error.
uwritec() can be called from user or interrupt context.