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Linux 2.6 - man page for err_peek_error (linux section 3SSL)

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ERR_get_error(3SSL)			     OpenSSL			      ERR_get_error(3SSL)

       ERR_get_error, ERR_peek_error, ERR_peek_last_error, ERR_get_error_line,
       ERR_peek_error_line, ERR_peek_last_error_line, ERR_get_error_line_data,
       ERR_peek_error_line_data, ERR_peek_last_error_line_data - obtain error code and data

	#include <openssl/err.h>

	unsigned long ERR_get_error(void);
	unsigned long ERR_peek_error(void);
	unsigned long ERR_peek_last_error(void);

	unsigned long ERR_get_error_line(const char **file, int *line);
	unsigned long ERR_peek_error_line(const char **file, int *line);
	unsigned long ERR_peek_last_error_line(const char **file, int *line);

	unsigned long ERR_get_error_line_data(const char **file, int *line,
		const char **data, int *flags);
	unsigned long ERR_peek_error_line_data(const char **file, int *line,
		const char **data, int *flags);
	unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
		const char **data, int *flags);

       ERR_get_error() returns the earliest error code from the thread's error queue and removes
       the entry. This function can be called repeatedly until there are no more error codes to

       ERR_peek_error() returns the earliest error code from the thread's error queue without
       modifying it.

       ERR_peek_last_error() returns the latest error code from the thread's error queue without
       modifying it.

       See ERR_GET_LIB(3) for obtaining information about location and reason of the error, and
       ERR_error_string(3) for human-readable error messages.

       ERR_get_error_line(), ERR_peek_error_line() and ERR_peek_last_error_line() are the same as
       the above, but they additionally store the file name and line number where the error
       occurred in *file and *line, unless these are NULL.

       ERR_get_error_line_data(), ERR_peek_error_line_data() and ERR_get_last_error_line_data()
       store additional data and flags associated with the error code in *data and *flags, unless
       these are NULL. *data contains a string if *flags&ERR_TXT_STRING. If it has been allocated
       by OPENSSL_malloc(), *flags&ERR_TXT_MALLOCED is true.

       The error code, or 0 if there is no error in the queue.

       err(3), ERR_error_string(3), ERR_GET_LIB(3)

       ERR_get_error(), ERR_peek_error(), ERR_get_error_line() and ERR_peek_error_line() are
       available in all versions of SSLeay and OpenSSL. ERR_get_error_line_data() and
       ERR_peek_error_line_data() were added in SSLeay 0.9.0.  ERR_peek_last_error(),
       ERR_peek_last_error_line() and ERR_peek_last_error_line_data() were added in OpenSSL

1.0.0e					    2002-11-29			      ERR_get_error(3SSL)
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