1 Open jobs for finishing GNU libc:
2 ---------------------------------
5 If you have time and talent to take over any of the jobs below please
6 contact <bug-glibc@gnu.org>.
8 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 [ 1] Port to new platforms or test current version on formerly supported
13 **** See http://www.gnu.org/software/libc/porting.html for more details.
16 [ 2] Test compliance with standards. If you have access to recent
17 standards (IEEE, ISO, ANSI, X/Open, ...) and/or test suites you
18 could do some checks as the goal is to be compliant with all
19 standards if they do not contradict each other.
22 [ 3] The IMHO opinion most important task is to write a more complete
23 test suite. We cannot get too many people working on this. It is
24 not difficult to write a test, find a definition of the function
25 which I normally can provide, if necessary, and start writing tests
26 to test for compliance. Beside this, take a look at the sources
27 and write tests which in total test as many paths of execution as
31 [ 4] Write translations for the GNU libc message for the so far
32 unsupported languages. GNU libc is fully internationalized and
33 users can immediately benefit from this.
35 Take a look at the matrix in
36 ftp://ftp.gnu.org/pub/gnu/ABOUT-NLS
37 for the current status (of course better use a mirror of ftp.gnu.org).
40 [ 8] If you enjoy assembler programming (as I do --drepper :-) you might
41 be interested in writing optimized versions for some functions.
42 Especially the string handling functions can be optimized a lot.
46 Faster String Functions
47 Henry Spencer, University of Toronto
48 Usenix Winter '92, pp. 419--428
50 or just ask. Currently mostly i?86 and Alpha optimized versions
51 exist. Please ask before working on this to avoid duplicate
55 [10] Extend regex and/or rx to work with wide characters and complete
56 implementation of character class and collation class handling.
58 It is planned to do a complete rewrite.
60 *** We have now multibyte character support. But a rewrite is still
64 [11] Write access function for netmasks, bootparams, and automount
65 databases for nss_files and nss_db module.
66 The functions should be embedded in the nss scheme. This is not
67 hard and not all services must be supported at once.
70 [15] Cleaning up the header files. Ideally, each header style should
71 follow the "good examples". Each variable and function should have
72 a short description of the function and its parameters. The prototypes
73 should always contain variable names which can help to identify their
76 int foo (int, int, int, int);
80 *** The conformtest.pl tool helps cleaning the namespace. As far as
81 known the prototypes all contain parameter names. But maybe some
82 comments can be improved.
85 [16] The libio stream file functions should be extended in a way to use
86 mmap to map the file and use it as the buffer to user sees. For
87 read-only streams this should be rather easy and it avoids all read()
90 A more sophisticated solution would use mmap also for writing. The
91 standards do not demand that the file on the disk is always in the
92 correct form so it would be possible to enlarge it always according
93 to the page size and install the correct length only for fclose() and
97 [18] Based on the sprof program we need tools to analyze the output. The
98 result should be a link map which specifies in which order the .o
99 files are placed in the shared object. This should help to improve
100 code locality and result in a smaller foorprint (in code and data
101 memory) since less pages are only used in small parts.
104 [19] A user-level STREAMS implementation should be available if the
105 kernel does not provide the support.
107 *** This is a much lower priority job now that STREAMS are optional in
111 [20] More conversion modules for iconv(3). Existing modules should be
112 extended to do things like transliteration if this is wanted.
113 For often used conversion a direct conversion function should be
117 [21] The nscd program and the stubs in the libc should be changed so
118 that each program uses only one socket connect. Take a look at
119 http://www.cygnus.com/~drepper/nscd.html
121 An alternative approach is to use an mmap()ed file. The idea is
123 - the nscd creates the hash tables and the information it stores
124 in it in a mmap()ed region. This means no pointers must be
127 if POSIX shared memory is available use a named shared memory
128 region to put the data in
129 - each program using NSS functionality tries to open the file
131 - by checking some timestamp (which the nscd renews frequently)
132 the programs can test whether the file is still valid
133 - if the file is valid look through the nscd and locate the
134 appropriate hash table for the database and lookup the data.
135 If it is included we are set.
136 - if the data is not yet in the database we contact the nscd using
137 the currently implemented methods.
140 [23] The `strptime' function needs to be completed. This includes among
141 other things that it must get teached about timezones. The solution
142 envisioned is to extract the timezones from the ADO timezone
143 specifications. Special care must be given names which are used
144 multiple times. Here the precedence should (probably) be according
145 to the geograhical distance. E.g., the timezone EST should be
146 treated as the `Eastern Australia Time' instead of the US `Eastern
147 Standard Time' if the current TZ variable is set to, say,
148 Australia/Canberra or if the current locale is en_AU.
151 [25] Sun's nscd version implements a feature where the nscd keeps N entries
152 for each database current. I.e., if an entries lifespan is over and
153 it is one of the N entries to be kept the nscd updates the information
154 instead of removing the entry.
156 How to decide about which N entries to keep has to be examined.
157 Factors should be number of uses (of course), influenced by aging.
158 Just imagine a computer used by several people. The IDs of the current
159 user should be preferred even if the last user spent more time.
162 [27] We need a second test suite with tests which cannot run during a normal
163 `make check' run. This test suite can require root priviledges and
164 can test things like DNS (i.e., require network access),
165 user-interaction, networking in general, and probably many other things.