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Document that returning 0 from the recv callback means EOF

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Signed-off-by: Hanno Becker <hanno.becker@arm.com>
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Hanno Becker 2021-07-23 07:23:47 +01:00 committed by Manuel Pégourié-Gonnard
parent f87422f019
commit c8ac785fc3
1 changed files with 4 additions and 3 deletions
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7
include/mbedtls/ssl.h
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@ -600,10 +600,11 @@ typedef int mbedtls_ssl_send_t( void *ctx,
* \param buf Buffer to write the received data to
* \param len Length of the receive buffer
*
* \return The callback must return the number of bytes received,
* or a non-zero error code.
* If performing non-blocking I/O, \c MBEDTLS_ERR_SSL_WANT_READ
* \returns If data has been received, the positive number of bytes received.
* \returns \c 0 if the connection has been closed.
* \returns If performing non-blocking I/O, \c MBEDTLS_ERR_SSL_WANT_READ
* must be returned when the operation would block.
* \returns Another negative error code on other kinds of failures.
*
* \note The callback may receive fewer bytes than the length of the
* buffer. It must always return the number of bytes actually