forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
454 lines
17 KiB
Groff
454 lines
17 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "ASYNC_START_JOB 3"
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.TH ASYNC_START_JOB 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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ASYNC_get_wait_ctx, ASYNC_init_thread, ASYNC_cleanup_thread, ASYNC_start_job, ASYNC_pause_job, ASYNC_get_current_job, ASYNC_block_pause, ASYNC_unblock_pause, ASYNC_is_capable \&\- asynchronous job management functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/async.h>
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\&
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\& int ASYNC_init_thread(size_t max_size, size_t init_size);
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\& void ASYNC_cleanup_thread(void);
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\&
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\& int ASYNC_start_job(ASYNC_JOB **job, ASYNC_WAIT_CTX *ctx, int *ret,
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\& int (*func)(void *), void *args, size_t size);
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\& int ASYNC_pause_job(void);
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\&
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\& ASYNC_JOB *ASYNC_get_current_job(void);
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\& ASYNC_WAIT_CTX *ASYNC_get_wait_ctx(ASYNC_JOB *job);
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\& void ASYNC_block_pause(void);
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\& void ASYNC_unblock_pause(void);
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\&
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\& int ASYNC_is_capable(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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OpenSSL implements asynchronous capabilities through an \s-1ASYNC_JOB.\s0 This
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represents code that can be started and executes until some event occurs. At
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that point the code can be paused and control returns to user code until some
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subsequent event indicates that the job can be resumed.
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.PP
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The creation of an \s-1ASYNC_JOB\s0 is a relatively expensive operation. Therefore, for
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efficiency reasons, jobs can be created up front and reused many times. They are
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held in a pool until they are needed, at which point they are removed from the
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pool, used, and then returned to the pool when the job completes. If the user
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application is multi-threaded, then \fBASYNC_init_thread()\fR may be called for each
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thread that will initiate asynchronous jobs. Before
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user code exits per-thread resources need to be cleaned up. This will normally
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occur automatically (see \fBOPENSSL_init_crypto\fR\|(3)) but may be explicitly
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initiated by using \fBASYNC_cleanup_thread()\fR. No asynchronous jobs must be
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outstanding for the thread when \fBASYNC_cleanup_thread()\fR is called. Failing to
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ensure this will result in memory leaks.
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.PP
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The \fBmax_size\fR argument limits the number of ASYNC_JOBs that will be held in
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the pool. If \fBmax_size\fR is set to 0 then no upper limit is set. When an
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\&\s-1ASYNC_JOB\s0 is needed but there are none available in the pool already then one
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will be automatically created, as long as the total of ASYNC_JOBs managed by the
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pool does not exceed \fBmax_size\fR. When the pool is first initialised
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\&\fBinit_size\fR ASYNC_JOBs will be created immediately. If \fBASYNC_init_thread()\fR is
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not called before the pool is first used then it will be called automatically
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with a \fBmax_size\fR of 0 (no upper limit) and an \fBinit_size\fR of 0 (no ASYNC_JOBs
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created up front).
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.PP
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An asynchronous job is started by calling the \fBASYNC_start_job()\fR function.
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Initially \fB*job\fR should be \s-1NULL.\s0 \fBctx\fR should point to an \s-1ASYNC_WAIT_CTX\s0
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object created through the \fBASYNC_WAIT_CTX_new\fR\|(3) function. \fBret\fR should
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point to a location where the return value of the asynchronous function should
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be stored on completion of the job. \fBfunc\fR represents the function that should
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be started asynchronously. The data pointed to by \fBargs\fR and of size \fBsize\fR
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will be copied and then passed as an argument to \fBfunc\fR when the job starts.
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ASYNC_start_job will return one of the following values:
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.IP "\fB\s-1ASYNC_ERR\s0\fR" 4
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.IX Item "ASYNC_ERR"
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An error occurred trying to start the job. Check the OpenSSL error queue (e.g.
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see \fBERR_print_errors\fR\|(3)) for more details.
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.IP "\fB\s-1ASYNC_NO_JOBS\s0\fR" 4
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.IX Item "ASYNC_NO_JOBS"
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There are no jobs currently available in the pool. This call can be retried
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again at a later time.
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.IP "\fB\s-1ASYNC_PAUSE\s0\fR" 4
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.IX Item "ASYNC_PAUSE"
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The job was successfully started but was \*(L"paused\*(R" before it completed (see
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\&\fBASYNC_pause_job()\fR below). A handle to the job is placed in \fB*job\fR. Other work
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can be performed (if desired) and the job restarted at a later time. To restart
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a job call \fBASYNC_start_job()\fR again passing the job handle in \fB*job\fR. The
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\&\fBfunc\fR, \fBargs\fR and \fBsize\fR parameters will be ignored when restarting a job.
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When restarting a job \fBASYNC_start_job()\fR \fBmust\fR be called from the same thread
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that the job was originally started from.
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.IP "\fB\s-1ASYNC_FINISH\s0\fR" 4
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.IX Item "ASYNC_FINISH"
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The job completed. \fB*job\fR will be \s-1NULL\s0 and the return value from \fBfunc\fR will
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be placed in \fB*ret\fR.
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.PP
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At any one time there can be a maximum of one job actively running per thread
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(you can have many that are paused). \fBASYNC_get_current_job()\fR can be used to get
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a pointer to the currently executing \s-1ASYNC_JOB.\s0 If no job is currently executing
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then this will return \s-1NULL.\s0
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.PP
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If executing within the context of a job (i.e. having been called directly or
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indirectly by the function \*(L"func\*(R" passed as an argument to \fBASYNC_start_job()\fR)
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then \fBASYNC_pause_job()\fR will immediately return control to the calling
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application with \s-1ASYNC_PAUSE\s0 returned from the \fBASYNC_start_job()\fR call. A
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subsequent call to ASYNC_start_job passing in the relevant \s-1ASYNC_JOB\s0 in the
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\&\fB*job\fR parameter will resume execution from the \fBASYNC_pause_job()\fR call. If
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\&\fBASYNC_pause_job()\fR is called whilst not within the context of a job then no
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action is taken and \fBASYNC_pause_job()\fR returns immediately.
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.PP
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\&\fBASYNC_get_wait_ctx()\fR can be used to get a pointer to the \s-1ASYNC_WAIT_CTX\s0
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for the \fBjob\fR. ASYNC_WAIT_CTXs can have a \*(L"wait\*(R" file descriptor associated
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with them. Applications can wait for the file descriptor to be ready for \*(L"read\*(R"
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using a system function call such as select or poll (being ready for \*(L"read\*(R"
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indicates that the job should be resumed). If no file descriptor is made
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available then an application will have to periodically \*(L"poll\*(R" the job by
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attempting to restart it to see if it is ready to continue.
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.PP
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An example of typical usage might be an async capable engine. User code would
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initiate cryptographic operations. The engine would initiate those operations
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asynchronously and then call \fBASYNC_WAIT_CTX_set_wait_fd\fR\|(3) followed by
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\&\fBASYNC_pause_job()\fR to return control to the user code. The user code can then
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perform other tasks or wait for the job to be ready by calling \*(L"select\*(R" or other
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similar function on the wait file descriptor. The engine can signal to the user
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code that the job should be resumed by making the wait file descriptor
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\&\*(L"readable\*(R". Once resumed the engine should clear the wake signal on the wait
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file descriptor.
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.PP
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The \fBASYNC_block_pause()\fR function will prevent the currently active job from
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pausing. The block will remain in place until a subsequent call to
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\&\fBASYNC_unblock_pause()\fR. These functions can be nested, e.g. if you call
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\&\fBASYNC_block_pause()\fR twice then you must call \fBASYNC_unblock_pause()\fR twice in
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order to re-enable pausing. If these functions are called while there is no
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currently active job then they have no effect. This functionality can be useful
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to avoid deadlock scenarios. For example during the execution of an \s-1ASYNC_JOB\s0 an
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application acquires a lock. It then calls some cryptographic function which
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invokes \fBASYNC_pause_job()\fR. This returns control back to the code that created
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the \s-1ASYNC_JOB.\s0 If that code then attempts to acquire the same lock before
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resuming the original job then a deadlock can occur. By calling
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\&\fBASYNC_block_pause()\fR immediately after acquiring the lock and
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\&\fBASYNC_unblock_pause()\fR immediately before releasing it then this situation cannot
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occur.
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.PP
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Some platforms cannot support async operations. The \fBASYNC_is_capable()\fR function
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can be used to detect whether the current platform is async capable or not.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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ASYNC_init_thread returns 1 on success or 0 otherwise.
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.PP
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ASYNC_start_job returns one of \s-1ASYNC_ERR, ASYNC_NO_JOBS, ASYNC_PAUSE\s0 or
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\&\s-1ASYNC_FINISH\s0 as described above.
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.PP
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ASYNC_pause_job returns 0 if an error occurred or 1 on success. If called when
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not within the context of an \s-1ASYNC_JOB\s0 then this is counted as success so 1 is
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returned.
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.PP
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ASYNC_get_current_job returns a pointer to the currently executing \s-1ASYNC_JOB\s0 or
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\&\s-1NULL\s0 if not within the context of a job.
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.PP
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\&\fBASYNC_get_wait_ctx()\fR returns a pointer to the \s-1ASYNC_WAIT_CTX\s0 for the job.
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.PP
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\&\fBASYNC_is_capable()\fR returns 1 if the current platform is async capable or 0
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otherwise.
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.SH "NOTES"
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.IX Header "NOTES"
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On Windows platforms the openssl/async.h header is dependent on some
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of the types customarily made available by including windows.h. The
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application developer is likely to require control over when the latter
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is included, commonly as one of the first included headers. Therefore
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it is defined as an application developer's responsibility to include
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windows.h prior to async.h.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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The following example demonstrates how to use most of the core async APIs:
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.PP
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.Vb 7
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\& #ifdef _WIN32
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\& # include <windows.h>
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\& #endif
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\& #include <stdio.h>
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\& #include <unistd.h>
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\& #include <openssl/async.h>
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\& #include <openssl/crypto.h>
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\&
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\& int unique = 0;
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\&
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\& void cleanup(ASYNC_WAIT_CTX *ctx, const void *key, OSSL_ASYNC_FD r, void *vw)
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\& {
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\& OSSL_ASYNC_FD *w = (OSSL_ASYNC_FD *)vw;
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\&
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\& close(r);
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\& close(*w);
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\& OPENSSL_free(w);
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\& }
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\&
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\& int jobfunc(void *arg)
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\& {
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\& ASYNC_JOB *currjob;
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\& unsigned char *msg;
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\& int pipefds[2] = {0, 0};
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\& OSSL_ASYNC_FD *wptr;
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\& char buf = \*(AqX\*(Aq;
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\&
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\& currjob = ASYNC_get_current_job();
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\& if (currjob != NULL) {
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\& printf("Executing within a job\en");
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\& } else {
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\& printf("Not executing within a job \- should not happen\en");
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\& return 0;
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\& }
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\&
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\& msg = (unsigned char *)arg;
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\& printf("Passed in message is: %s\en", msg);
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\&
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\& if (pipe(pipefds) != 0) {
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\& printf("Failed to create pipe\en");
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\& return 0;
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\& }
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\& wptr = OPENSSL_malloc(sizeof(OSSL_ASYNC_FD));
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\& if (wptr == NULL) {
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\& printf("Failed to malloc\en");
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\& return 0;
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\& }
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\& *wptr = pipefds[1];
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\& ASYNC_WAIT_CTX_set_wait_fd(ASYNC_get_wait_ctx(currjob), &unique,
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\& pipefds[0], wptr, cleanup);
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\&
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\& /*
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\& * Normally some external event would cause this to happen at some
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\& * later point \- but we do it here for demo purposes, i.e.
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\& * immediately signalling that the job is ready to be woken up after
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\& * we return to main via ASYNC_pause_job().
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\& */
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\& write(pipefds[1], &buf, 1);
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\&
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\& /* Return control back to main */
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\& ASYNC_pause_job();
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\&
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\& /* Clear the wake signal */
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\& read(pipefds[0], &buf, 1);
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\&
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\& printf ("Resumed the job after a pause\en");
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\&
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\& return 1;
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\& }
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\&
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\& int main(void)
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\& {
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\& ASYNC_JOB *job = NULL;
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\& ASYNC_WAIT_CTX *ctx = NULL;
|
|
\& int ret;
|
|
\& OSSL_ASYNC_FD waitfd;
|
|
\& fd_set waitfdset;
|
|
\& size_t numfds;
|
|
\& unsigned char msg[13] = "Hello world!";
|
|
\&
|
|
\& printf("Starting...\en");
|
|
\&
|
|
\& ctx = ASYNC_WAIT_CTX_new();
|
|
\& if (ctx == NULL) {
|
|
\& printf("Failed to create ASYNC_WAIT_CTX\en");
|
|
\& abort();
|
|
\& }
|
|
\&
|
|
\& for (;;) {
|
|
\& switch (ASYNC_start_job(&job, ctx, &ret, jobfunc, msg, sizeof(msg))) {
|
|
\& case ASYNC_ERR:
|
|
\& case ASYNC_NO_JOBS:
|
|
\& printf("An error occurred\en");
|
|
\& goto end;
|
|
\& case ASYNC_PAUSE:
|
|
\& printf("Job was paused\en");
|
|
\& break;
|
|
\& case ASYNC_FINISH:
|
|
\& printf("Job finished with return value %d\en", ret);
|
|
\& goto end;
|
|
\& }
|
|
\&
|
|
\& /* Wait for the job to be woken */
|
|
\& printf("Waiting for the job to be woken up\en");
|
|
\&
|
|
\& if (!ASYNC_WAIT_CTX_get_all_fds(ctx, NULL, &numfds)
|
|
\& || numfds > 1) {
|
|
\& printf("Unexpected number of fds\en");
|
|
\& abort();
|
|
\& }
|
|
\& ASYNC_WAIT_CTX_get_all_fds(ctx, &waitfd, &numfds);
|
|
\& FD_ZERO(&waitfdset);
|
|
\& FD_SET(waitfd, &waitfdset);
|
|
\& select(waitfd + 1, &waitfdset, NULL, NULL, NULL);
|
|
\& }
|
|
\&
|
|
\& end:
|
|
\& ASYNC_WAIT_CTX_free(ctx);
|
|
\& printf("Finishing\en");
|
|
\&
|
|
\& return 0;
|
|
\& }
|
|
.Ve
|
|
.PP
|
|
The expected output from executing the above example program is:
|
|
.PP
|
|
.Vb 8
|
|
\& Starting...
|
|
\& Executing within a job
|
|
\& Passed in message is: Hello world!
|
|
\& Job was paused
|
|
\& Waiting for the job to be woken up
|
|
\& Resumed the job after a pause
|
|
\& Job finished with return value 1
|
|
\& Finishing
|
|
.Ve
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fBcrypto\fR\|(7), \fBERR_print_errors\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
ASYNC_init_thread, ASYNC_cleanup_thread,
|
|
ASYNC_start_job, ASYNC_pause_job, ASYNC_get_current_job, \fBASYNC_get_wait_ctx()\fR,
|
|
\&\fBASYNC_block_pause()\fR, \fBASYNC_unblock_pause()\fR and \fBASYNC_is_capable()\fR were first
|
|
added in OpenSSL 1.1.0.
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2015\-2019 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
|
<https://www.openssl.org/source/license.html>.
|