diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/info/mds.texinfo | 63 |
1 files changed, 62 insertions, 1 deletions
diff --git a/doc/info/mds.texinfo b/doc/info/mds.texinfo index 87655f1..b1e76c5 100644 --- a/doc/info/mds.texinfo +++ b/doc/info/mds.texinfo @@ -6885,7 +6885,7 @@ interruption unless it is interrupted one hundred times within the same clock second. The parameters and return value are exactly those of @code{waitpid}. -@item @code{verify_utf8}[(@code{const char* string, int allow_modified_nul}) @arrow{} @code{int}] +@item @code{verify_utf8} [(@code{const char* string, int allow_modified_nul}) @arrow{} @code{int}] @fnindex @code{verify_utf8} @cpindex Security, encoding, UTF-8 @cpindex UTF-8, security @@ -6900,6 +6900,67 @@ NUL-character.@footnote{Remember @code{0} is used to terminated the string, but @code{192 128} is not.} This function returns zero if the @code{string} is properly formatted, and @code{-1} otherwise. + +@item @code{construct_error_message} [(@code{const char* restrict recv_client_id, const char* restrict recv_message_id, int custom, int errnum, const char* restrict message, char** restrict send_buffer, size_t* restrict send_buffer_size}) @arrow{} @code{size_t}] +This function constructs an error message to be sent to +a client. It implements the @code{error} protocol with +with identifying header @code{Command: error}. +The parameters are: + +@table @code +@item recv_client_id +The client ID attached on the message that was +received in the message that caused the error, +that is, the value of the header @code{Client ID} +on the received message and the header @code{To} +in the message to construct. Must not be @code{NULL}. +@item recv_message_id +The message ID attached on the message that was +received in the message that caused the error, +that is, the value of the header @code{Message ID} +on the received message and the header +@code{In response to} in the message to construct. +Must not be @code{NULL}. +@item custom +If and only if set to zero, value of @code{errnum} +is a value for @code{errno}. +@item errnum +A numeric value describing the error. A negative +value, such as @code{-1} should be used if the +error does not have a numeric value. Zero is +reserved to indicate success. +@item message +The description of the error, the line feed at the end +is added automatically and thus should not be included. +The description should be a statement in mid-sentence +case and without punctuation at the end. +@code{NULL} if no description should be included. +@item send_buffer +Pointer to the buffer where the message should be stored, +it should contain the current send buffer. Must not be +@code{NULL} +@item send_buffer_size +Pointer to the allocation size of @code{*send_buffer}, +it should contain the current size of @code{*send_buffer} +and will be updated with the new size. Must not be +@code{NULL} +@end table + +It is not allowed to have a negative value on +@code{errnum} and a zero value on @code{custom} +at the same time. + +This function returns the length of the constructed +message on success, and zero on failure. On failure +@code{errno} will be set accordingly. + +@item @code{send_error} [(@code{..., int socket_fd}) @arrow{} @code{int}] +This function is a wrapper for @code{construct_error_message} that also +sends constructed message to the socket whose file descriptor is @code{socket_fd}. +This function has the same parameters as @code{construct_error_message}, +but with one additional parameter as its last parameter: @code{socket_fd}. +Also, instead of returning the length of the message, it returns zero +on success and @code{-1} on error. @end table |