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serial: return error on unexpected empty read

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fixes vsergeev/lua-periphery#20.
This commit is contained in:
Vanya A. Sergeev
2019-10-08 22:30:25 -05:00
parent 04329dd5f1
commit 2b5f6e1935
1 changed files with 4 additions and 0 deletions
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src/serial.c
+4
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@@ -263,6 +263,10 @@ int serial_read(serial_t *serial, uint8_t *buf, size_t len, int timeout_ms) {
if ((ret = read(serial->fd, buf + bytes_read, bytes_left)) < 0)
return _serial_error(serial, SERIAL_ERROR_IO, errno, "Reading serial port");
/* Empty read */
if (ret == 0 && len != 0)
return _serial_error(serial, SERIAL_ERROR_IO, 0, "Reading serial port: unexpected empty read");
bytes_read += ret;
bytes_left -= ret;
} while (bytes_left > 0);