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Diffstat (limited to 'doc/info/mds.texinfo')
| -rw-r--r-- | doc/info/mds.texinfo | 200 |
1 files changed, 198 insertions, 2 deletions
diff --git a/doc/info/mds.texinfo b/doc/info/mds.texinfo index 8963632..d1b8514 100644 --- a/doc/info/mds.texinfo +++ b/doc/info/mds.texinfo @@ -4,9 +4,23 @@ @setfilename mds.info @settitle mds +@c @set AFIVEPAPER +@c @set SMALLBOOK +@c This document does not look too good on A5-paper +@c This document looks best on A4-paper, but smallbook format is acceptable + +@ifset AFIVEPAPER +@afivepaper +@end ifset +@ifclear AFIVEPAPER +@ifset SMALLBOOK +@smallbook +@end ifset +@ifclear SMALLBOOK @afourpaper -@c This document does not support @afivepaper -@c This document does not support @smallbook +@set AFOURPAPER +@end ifclear +@end ifclear @documentencoding UTF-8 @documentlanguage en @@ -981,11 +995,15 @@ Command: keyboard-enumeration\n @node Portability @section Portability +@cpindex Portability For optimal portability, there are some restrictions on protocols. @itemize @bullet{} @item +@cpindex Integers, minimum value restriction +@cpindex Minimum value restriction on integers +@cpindex Restrictions on minimum value for integers Because C allows unsigned integers to be encoded as either sign and magnitude, one's complement or two's complement@footnote{GCC only allows two's complement}, @@ -1005,6 +1023,10 @@ size integers or otherwise make sure that the value can be properly stored and used. @item +@tpindex @code{uint64_t} +@cpindex Integers, unsigned, restriction +@cpindex Unsigned integer, restriction +@cpindex Restrictions on unsigned integers Integer 64-bits that are not especially encoded must not be unsigned if the bit-size is fixed. This is because some programming languages @@ -1013,12 +1035,15 @@ are signed; a large enough unsigned 64-bit integer would overflow. @item +@cpindex Endianness, portability Native endianness when a endianness is choosen. Do not assume big endianness, but the same endianness that appear on the same machine when using C. @item +@cpindex UTF-8, portability +@cpindex Strings, portibility All strings musts be encoded in UTF-8 without any NUL-character unless express permission is given. NUL-character may be encoded either @@ -1033,6 +1058,8 @@ and is hence disallowed by newer specifications of UTF-8. @item +@cpindex New line, portability +@cpindex Strings, portibility The new line-character is always LF (@code{'\n'}, 10, line feed) and never a combination of LF and any other character, or multiple LF:s. @@ -1451,6 +1478,7 @@ and commands, @command{cmdipc} and @command{ipcmd} can be used for this purpose. We will use @command{cmdipc} in an example: +@ifset AFOURPAPER @example S=$(cmdipc -Scx set 1 | cut -d ' ' -f 2) # Create a System V semaphore with the value 1. @@ -1462,6 +1490,22 @@ cmdipc -Sk $S z # Wait for the semaphore's value to become 0. cmdipc -Srk $S # Remove the semaphore. mds-respawn @{ mds-bar @} & # Spawn `mds-bar`. @end example +@end ifset +@ifclear AFOURPAPER +@example +S=$(cmdipc -Scx set 1 | cut -d ' ' -f 2) +# Create a System V semaphore with the value 1. + +mds-respawn @{ mds-foo --on-init-sh="cmdipc -Sk $S p" @} & +# Spawn `mds-foo` and decrease the semaphore with +# 1 when initialised. + +cmdipc -Sk $S z # Wait for the semaphore's + # value to become 0. +cmdipc -Srk $S # Remove the semaphore. +mds-respawn @{ mds-bar @} & # Spawn `mds-bar`. +@end example +@end ifclear @pgindex @command{mds-reg} This is however seldom necessary as @command{mds-reg} can @@ -3674,6 +3718,7 @@ The entry will also be removed, unless @code{Time to live: forever} is used, if the server crashes or is re-executed. +@sgindex @code{SIGARLM} It is up to the implementation to choose when the removal actually takes place. For example, the reference implementation will pop entries that have timed out when @@ -3949,6 +3994,7 @@ Alpha channel should be included but ignored if @code{Has alpha: no}, in such as it is best to set it to full. +@ifset AFOURPAPER Example image with @code{Bytes: 2}, @code{Has alpha: no} and @code{Size: 3}: @example @@ -3971,6 +4017,28 @@ FF FF 02 01 0 0 0 0 FF FF 0 0 04 03 0 0 FF FF 0 0 0 0 06 05 FF FF 08 07 0 0 0 0 FF FF 0 0 0A 09 0 0 FF FF 0 0 0 0 0C 0B FF FF 0E 0D 0 0 0 0 FF FF 0 0 10 0F 0 0 FF FF 0 0 0 0 12 11 @end example +@end ifset +@ifclear AFOURPAPER +Example image with @code{Bytes: 2}, +@code{Has alpha: no} and @code{Size: 2}: +@example +sRGB(x0102, 0, 0), sRGB(0, x0304, 0) +sRGB(x0708, 0, 0), sRGB(0, x090A, 0) +@end example + +Encoding of example image in hexadecimal representation: +@example +FFFF 0102 0000 0000 FFFF 0000 0304 0000 +FFFF 0708 0000 0000 FFFF 0000 090A 0000 +@end example + +Note that on a big-endian system this would be: +@footnote{x86_64 computers are big-endian.} +@example +FF FF 02 01 0 0 0 0 FF FF 0 0 04 03 0 0 +FF FF 08 07 0 0 0 0 FF FF 0 0 0A 09 0 0 +@end example +@end ifclear It is up to the networking servers to translate the encoding between machines.@footnote{The host @@ -5517,6 +5585,7 @@ a list, reads its variable @code{size_t size}. The variable @code{uint64_t* clients} is used to retrieve stored elements. +@ifset AFOURPAPER @example void print_elements(client_list_t* this) @{ @@ -5525,6 +5594,18 @@ void print_elements(client_list_t* this) printf("Element #%zu: %" PRIu64 "\n", i, this->elements[i]); @} @end example +@end ifset +@ifclear AFOURPAPER +@example +void print_elements(client_list_t* this) +@{ + size_t i; + for (i = 0; i < this->size; i++) + printf("Element #%zu: %" PRIu64 "\n", + i, this->elements[i]); +@} +@end example +@end ifclear @@ -5857,6 +5938,7 @@ be stored to the variable @code{entry} and the bucket index will be stored to the variable @code{i}. +@ifset AFOURPAPER @example void print_hash_table(hash_table_t* table) @{ @@ -5866,6 +5948,19 @@ void print_hash_table(hash_table_t* table) printf("%zu --> %zu\n", entry->key, entry->value); @} @end example +@end ifset +@ifclear AFOURPAPER +@example +void print_hash_table(hash_table_t* table) +@{ + hash_entry_t* entry; + size_t i; + foreach_hash_table_entry (*table, i, entry) + printf("%zu --> %zu\n", entry->key, + entry->value); +@} +@end example +@end ifclear Note the the data type for the parameter @code{this} is not a popinter. @@ -6109,6 +6204,7 @@ The server is re-executing. @item --alarm=SECONDS @opindex @option{--alarm} +@sgindex @code{SIGALRM} Kill the process after @var{SECONDS} seconds. At most one minute. @@ -6813,6 +6909,7 @@ character other than space.}. Therefore the letter is prefixed with the word `letter'. For example: +@ifset AFOURPAPER @example <keycode 16> : <letter q> # The Q-key has keycode 16 (on QWERTY) <letter q> : "q" # The Q-key should produce a `q' @@ -6820,6 +6917,21 @@ For example: <caps q> : "Q" # or when caps is used <shift caps letter q> : "q" # but not when both are used @end example +@end ifset +@ifclear AFOURPAPER +@example +# The Q-key has keycode 16 (on QWERTY) +<keycode 16> : <letter q> +# The Q-key should produce a `q' +<letter q> : "q" +# but `Q' when shift is used +<shift letter q> : "Q" +# or when caps is used +<caps q> : "Q" +# but not when both are used +<shift caps letter q> : "q" +@end example +@end ifclear Special characters like simple double quotes, backspace and, in @code{<>}-notation, greater than @@ -6975,6 +7087,7 @@ compiler required that the @option{--force} flag is used and that the unordered subsequences uses double brackets: +@ifset AFOURPAPER @example <dead compose> ("1" "2" "3" "4" "5") : "120" <dead compose> (("1" "2" "3" "4" "5" "6")) : "720" @@ -6982,6 +7095,14 @@ double brackets: <dead compose> (("1" "2" "3" "4" "5" "6" "7" "8")) : "40320" <dead compose> (("1" "2" "3" "4" "5" "6" "7" "8" "9")) : "362880" @end example +@end ifset +@ifclear AFOURPAPER +@example +<dead compose> ("1" "2" "3" "4" "5") : "120" +<dead compose> (("1" "2" "3" "4" "5" "6")) : "720" +<dead compose> (("1" "2" "3" "4" "5" "6" "7")) : "5040" +@end example +@end ifclear @@ -7191,10 +7312,19 @@ built-in functions named `add/2' and `sub/2'. Alternation can be used to invoke a macro: +@ifset AFOURPAPER @example letter(["a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m"]) letter(["n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"]) @end example +@end ifset +@ifclear AFOURPAPER +@example +letter(["a" "b" "c" "d" "e" "f" "g" "h" "i" "j"]) +letter(["k" "l" "m" "n" "o" "p" "q" "r" "s" "t"]) +letter(["u" "v" "w" "x" "y" "z"]) +@end example +@end ifclear You may use `.' in an alternation, in that case macro is called once with the argument, causing it @@ -7206,6 +7336,9 @@ example want to call the macro `letter/1' for all letters betweeh and including `a' and `z' we can just write +@ifclear AFOURPAPER +@page +@end ifclear @example for "a" to "z" as \1 letter(\1) @@ -8491,6 +8624,9 @@ transition from @code{X-release} to @code{X}. Clients should not set the cursor to either of them, it is up to the server to do this based on events from the rat device. +@ifset AFIVEPAPER +@page +@end ifset @table @code @item default This is the default cursor. It is used as a fallback if no @@ -8554,6 +8690,9 @@ small menu. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item text This cursor should be used when the rat pointers is above an horizontal text that can be selected and possibly edited. @@ -8656,6 +8795,9 @@ of animated ring. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item pointer This cursor indicates that the object beneath it is clickable. Typically a link in a web browser. @@ -8764,6 +8906,9 @@ This cursor is usually rendered as @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item move This cursor indicates that the dragged object will be moved upon release, or otherwise @@ -8828,6 +8973,9 @@ links next to it, or an arced arrow. @end example @vskip 0pt plus 2filll +@ifclear AFOURPAPER +@page +@end ifclear @item no-drop This cursor indicates that the dragged object cannot be release where the rat pointer is @@ -8889,6 +9037,9 @@ a diagonal line through it. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item not-allowed This cursor is used to indicate that moving the rat will also move the object beneath @@ -8915,7 +9066,9 @@ vertical and horizontal twin-headed arrow. @end example @vskip 0pt plus 2filll +@ifclear AFIVEPAPER @page +@end ifclear @item up-arrow This cursor is typically used to identify an insertion point. @@ -8990,6 +9143,9 @@ horizontally towards it. @end example @vskip 0pt plus 2filll +@ifclear AFOURPAPER +@page +@end ifclear @item row-resize This cursor is used to indicate the the cursor is within a region that allows it rat to be used to resize a column. @@ -9091,7 +9247,9 @@ west pointing arrow. @end example @vskip 0pt plus 2filll +@ifclear AFIVEPAPER @page +@end ifclear @item e-resize If this cursor is missing, @code{e-select} should be used as the first fallback, @@ -9115,6 +9273,9 @@ wall at the arrow head. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item e-select If this cursor is missing, @code{e-resize} should be used as the first fallback, @@ -9137,6 +9298,9 @@ east pointing arrow. @end example @vskip 0pt plus 2filll +@ifset SMALLBOOK +@page +@end ifset @item n-resize If this cursor is missing, @code{n-select} should be used as the first fallback, @@ -9169,7 +9333,9 @@ wall at the arrow head. @end example @vskip 0pt plus 2filll +@ifclear SMALLBOOK @page +@end ifclear @item n-select If this cursor is missing, @code{n-resize} should be used as the first fallback, @@ -9199,6 +9365,9 @@ north pointing arrow. @end example @vskip 0pt plus 2filll +@ifclear AFOURPAPER +@page +@end ifclear @item s-resize If this cursor is missing, @code{s-select} should be used as the first fallback, @@ -9231,7 +9400,9 @@ wall at the arrow head. @end example @vskip 0pt plus 2filll +@ifclear SMALLBOOK @page +@end ifclear @item s-select If this cursor is missing, @code{s-resize} should be used as the first fallback, @@ -9261,6 +9432,9 @@ south pointing arrow. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item nw-resize If this cursor is missing, @code{nw-select} should be used as the first fallback, @@ -9293,7 +9467,9 @@ with a corner at the arrow head. @end example @vskip 0pt plus 2filll +@ifclear SMALLBOOK @page +@end ifclear @item nw-select If this cursor is missing, @code{nw-resize} should be used as the first fallback, @@ -9322,6 +9498,9 @@ north-west pointing arrow. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item se-resize If this cursor is missing, @code{se-select} should be used as the first fallback, @@ -9354,7 +9533,9 @@ with a corner at the arrow head. @end example @vskip 0pt plus 2filll +@ifclear SMALLBOOK @page +@end ifclear @item se-select If this cursor is missing, @code{se-resize} should be used as the first fallback, @@ -9383,6 +9564,9 @@ south-east pointing arrow. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item ne-resize If this cursor is missing, @code{ne-select} should be used as the first fallback, @@ -9415,7 +9599,9 @@ with a corner at the arrow head. @end example @vskip 0pt plus 2filll +@ifclear SMALLBOOK @page +@end ifclear @item ne-select If this cursor is missing, @code{ne-resize} should be used as the first fallback, @@ -9444,6 +9630,9 @@ north-east pointing arrow. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item sw-resize If this cursor is missing, @code{sw-select} should be used as the first fallback, @@ -9476,7 +9665,9 @@ with a corner at the arrow head. @end example @vskip 0pt plus 2filll +@ifclear SMALLBOOK @page +@end ifclear @item sw-select If this cursor is missing, @code{sw-resize} should be used as the first fallback, @@ -9544,7 +9735,9 @@ east and west pointing twin-arrow. @end example @vskip 0pt plus 2filll +@ifclear AFIVEPAPER @page +@end ifclear @item ns-resize If this cursor is missing, @code{ns-select} should be used as the first fallback, and @@ -9626,6 +9819,9 @@ optionally with a corner at the arrow heads. @end example @vskip 0pt plus 2filll +@ifset AFIVEPAPER +@page +@end ifset @item nesw-resize If this cursor is missing, @code{all-resize} should be used as the first fallback. |