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// SPDX-License-Identifier: GPL-2.0
#include <unistd.h>
/* As a regular read(2), but allows to specify a timeout in micro-seconds.
* Returns -EAGAIN on timeout.
*/
int read_with_timeout(int fd, char *buf, size_t count, long usec);
於是可以不回頭的逆風飛翔 不怕心頭有雨 眼底有霜