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03066ed310
int read_with_timeout(int fd, char *buf, size_t count, long usec) As a regular read(2), but allows to specify a timeout in micro-seconds. Returns -EAGAIN on timeout. Implemented using select(). Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20241112110906.3045278-3-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
21 lines
450 B
C
21 lines
450 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <sys/select.h>
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#include <unistd.h>
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#include <errno.h>
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int read_with_timeout(int fd, char *buf, size_t count, long usec)
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{
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const long M = 1000 * 1000;
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struct timeval tv = { usec / M, usec % M };
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fd_set fds;
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int err;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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err = select(fd + 1, &fds, NULL, NULL, &tv);
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if (err < 0)
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return err;
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if (FD_ISSET(fd, &fds))
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return read(fd, buf, count);
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return -EAGAIN;
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}
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