mirror of
https://github.com/openssl/openssl.git
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66 lines
2.0 KiB
Plaintext
66 lines
2.0 KiB
Plaintext
=pod
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=head1 NAME
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ERR_error_string, ERR_error_string_n, ERR_lib_error_string,
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ERR_func_error_string, ERR_reason_error_string - obtain human-readable
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error message
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=head1 SYNOPSIS
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#include <openssl/err.h>
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char *ERR_error_string(unsigned long e, char *buf);
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void ERR_error_string_n(unsigned long e, char *buf, size_t len);
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const char *ERR_lib_error_string(unsigned long e);
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const char *ERR_func_error_string(unsigned long e);
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const char *ERR_reason_error_string(unsigned long e);
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=head1 DESCRIPTION
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ERR_error_string() generates a human-readable string representing the
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error code I<e>, and places it at I<buf>. I<buf> must be at least 256
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bytes long. If I<buf> is B<NULL>, the error string is placed in a
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static buffer.
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Note that this function is not thread-safe and does no checks on the size
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of the buffer; use ERR_error_string_n() instead.
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ERR_error_string_n() is a variant of ERR_error_string() that writes
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at most I<len> characters (including the terminating 0)
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and truncates the string if necessary.
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For ERR_error_string_n(), I<buf> may not be B<NULL>.
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The string will have the following format:
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error:[error code]:[library name]:[function name]:[reason string]
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I<error code> is an 8 digit hexadecimal number, I<library name>,
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I<function name> and I<reason string> are ASCII text.
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ERR_lib_error_string(), ERR_func_error_string() and
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ERR_reason_error_string() return the library name, function
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name and reason string respectively.
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If there is no text string registered for the given error code,
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the error string will contain the numeric code.
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L<ERR_print_errors(3)> can be used to print
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all error codes currently in the queue.
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=head1 RETURN VALUES
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ERR_error_string() returns a pointer to a static buffer containing the
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string if I<buf> B<== NULL>, I<buf> otherwise.
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ERR_lib_error_string(), ERR_func_error_string() and
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ERR_reason_error_string() return the strings, and B<NULL> if
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none is registered for the error code.
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=head1 SEE ALSO
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L<err(3)>, L<ERR_get_error(3)>,
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L<ERR_print_errors(3)>
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=cut
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