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94 lines (84 loc) · 3.57 KB
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#ifndef LIBSSH2_SESSION_H
#define LIBSSH2_SESSION_H
/* Copyright (C) Sara Golemon <sarag@libssh2.org>
* Copyright (C) Daniel Stenberg
* Copyright (C) Simon Josefsson <simon@josefsson.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/* Conveniance-macros to allow code like this;
int rc = BLOCK_ADJUST(rc, session, session_startup(session, sock));
int rc = BLOCK_ADJUST_ERRNO(ptr, session, session_startup(session, sock));
The point being to make sure that while in non-blocking mode these always
return no matter what the return code is, but in blocking mode it blocks
if EAGAIN is the reason for the return from the underlying function.
*/
#define BLOCK_ADJUST(rc, sess, x) \
do { \
time_t entry_time = time(NULL); \
do { \
rc = x; \
/* the order of the check below is important to properly \
deal with the case when the 'sess' is freed */ \
if((rc != LIBSSH2_ERROR_EAGAIN) || !sess->api_block_mode) \
break; \
rc = _libssh2_wait_socket(sess, entry_time); \
} while(!rc); \
} while(0)
/*
* For functions that returns a pointer, we need to check if the API is
* non-blocking and return immediately. If the pointer is non-NULL we return
* immediately. If the API is blocking and we get a NULL we check the errno
* and *only* if that is EAGAIN we loop and wait for socket action.
*/
#define BLOCK_ADJUST_ERRNO(ptr, sess, x) \
do { \
time_t entry_time = time(NULL); \
int rc; \
do { \
ptr = x; \
if(!sess->api_block_mode || \
(ptr != NULL) || \
(libssh2_session_last_errno(sess) != LIBSSH2_ERROR_EAGAIN)) \
break; \
rc = _libssh2_wait_socket(sess, entry_time); \
} while(!rc); \
} while(0)
int _libssh2_wait_socket(LIBSSH2_SESSION *session, time_t entry_time);
/* this is the lib-internal set blocking function */
int _libssh2_session_set_blocking(LIBSSH2_SESSION * session, int blocking);
#endif /* LIBSSH2_SESSION_H */