Annotation of dietlibc/CHANGES, revision 1.42
1.34 fefe 1: 0.7.3:
2: vsnprintf(0,...) estimated the length of strings with a padding width
3: incorrectly.
1.35 fefe 4: new reboot() from Olaf.
1.36 fefe 5: added prototypes for getsockopt and setsockopt.
1.39 fefe 6: added experimental sem* and shm*
1.38 fefe 7: define EXIT_SUCCESS and EXIT_FAILURE
1.40 fefe 8: added setvbuf (only changes mode, not buffer)
1.41 fefe 9: added dietwarning.h (woohoo, linker warnings!) and used it to warn of
10: insecurity (system, sprintf) or bloat (printf and stdio).
1.42 ! fefe 11: added qsort() and bsearch(). Benchmark on 1000 random ints:
! 12: glibc: 679414 cycles qsort and 3352 cycles bsearch
! 13: diet libc: 300010 cycles qsort, 553 cycles bsearch
! 14: I have no idea why glibc is so slow.
1.34 fefe 15:
1.21 fefe 16: 0.7.2:
17: added several prototypes to already implemented functions and
18: <sys/reboot.h>. Thanks for Abraham for pointing this out.
1.22 fefe 19: added prototypes for process group and dup syscalls. Thanks to
20: Abraham again. He also contributed an implementation for daemon(),
21: an ugly BSD hack. I decided to diversify the lib/ directory a
22: little and now created a libugly/ directory for stuff like system()
23: and daemon() ;-)
24: added libstdio and moved all that stdio crap from lib/ there. The
25: idea is to start separating now what we will separate for shared
26: libraries anyway.
1.26 fefe 27: optimized x86 unified-syscall by Olaf.
1.27 fefe 28: added limits.h, removed __ARCHBITS from endian.h (use __WORDSIZE from
29: limits.h instead)
30: added remove.c and enough cruft to limits.h to make it compile lzo,
31: lzop and bzip2.
1.28 fefe 32: added mktime, asctime_r, asctime and ctime (needed for gzip).
33: Someone will need to implement a reader for the glibc localtime file
1.31 fefe 34: format some day (man tzfile, ugh!) :-(
1.29 fefe 35: added unlink prototype to unistd.h.
36: added gmtime and gmtime_r.
1.31 fefe 37: fixed sparc unified syscall error handling (please upgrade!).
1.30 fefe 38: removed readdir glibc compatibility cruft.
1.31 fefe 39: removed stat glibc compatibility cruft.
1.32 fefe 40: oops, my fread was broken for pipes.
1.33 fefe 41: Olaf found a bug in pipe() for sparc, too.
1.21 fefe 42:
1.9 fefe 43: 0.7.1:
1.11 fefe 44: optimized away the static arrays from __ltostr and __lltostr.
45: optimized away the static arrays (and more!) from strtoul and strtoull.
46: added system (by Olaf).
1.12 fefe 47: added tolower and toupper
1.13 fefe 48: added getopt from Olaf (~600 bytes on x86!)
1.14 fefe 49: added clone for mips (by Olaf).
50: fixed longjmp and setjmp on sparc not to require glibc include files.
1.15 olaf 51: added pause for all (by Olaf).
1.17 fefe 52: added __attribute__ ((__const__)) to ctype.h
1.16 fefe 53: added isupper and islower.
54: added putc and putchar as macros.
1.17 fefe 55: added strcasecmp and strncasecmp (thanks to Abraham vd Merwe for
56: insightful discussions and patches I partially used for the last three)
1.18 fefe 57: added getpriority and setpriority (also by Abraham)
1.19 fefe 58: oops, I broke strtoul in a recent optimization attempt.
1.20 fefe 59: oi, setjmp and longjmp were broken on other platforms, too!
60: Thanks to Sébastien Côté for reporting this.
1.9 fefe 61:
62: 0.7:
1.6 olaf 63: clone support for i386,alpha,arm and sparc by Olaf.
1.1 cvs 64: Initial dynamic loading glue for i386, also by Olaf.
65: We don't have a dynamic loader yet, so this is not yet usable.
66: added readv, sigdelset, sigaltstack, sigfillset, sigismember, usleep,
67: vsprintf, writev, all by Olaf.
1.2 fefe 68: imported readdir fix from Guillaume. Mhh, can the kernel interface
69: really be this broken?
1.3 fefe 70: Found a kludgy way to detect whether the kernel includes define struct
71: stat64 (they also define STAT64_HAS_BROKEN_ST_INO). If this does
72: not work for you, please tell me!
1.4 fefe 73: Removed bogus __seek_types enum, it's a bunch of #defines now.
1.7 fefe 74: Fixed stdio line buffering. The code was already there but I forgot
75: to mark stdio and stdout as line buffered. This should really be
76: done dynamically using isatty, though.
1.8 fefe 77: Removed superfluous "if (1)" in execvp.c
1.1 cvs 78:
79: 0.6.14:
80: *scanf did not append the 0 byte for %s.
81: added creat and changed creat to call open directly instead of open64.
82: did for fread what 0.6.10 did for fwrite.
83: repaired buffered stdio a little (line buffering is still not
84: supported).
85: [All of these bugs have been reported by Guillaume. Thanks!]
86: added __pure__ to strchr and strrchr in <string.h>
87:
88: 0.6.13:
89: included COPYING to make clear that the diet libc is covered by the
90: GNU General Public License (and _not_ the LGPL). That means that
91: you need to obtain a license from me if you want to use the diet
92: libc in a proprietary program that you want to distribute.
93: The x86 unified syscall swapped arguments #4 and #5 and noone
94: noticed until now! Thanks to Guillaume Cottenceau for reporting
95: this!
96: The malloc had a subtle bug with small allocations that could cause
97: segfault. Guillaume reported it, Olaf fixed it.
98:
99: 0.6.12:
100: added assert, statfs and fstatfs
101: added include/net/if.h so fget compiles again.
102:
103: 0.6.11:
104: added putenv.
105:
106: 0.6.10:
107: fixed fwrite. It returned the number of bytes written, not the number
108: of records. Thanks to Albert D. Cahalan for pointing this out.
109: fixed fgets. It returned EOF on empty lines. Thanks, Erik Frey.
110: added brk and sbrk. harold@nb.com.sg made me do it.
111:
112: 0.6.9:
113: fixed execvp not to return on ENOENT
114: did for {open|read|close|seek|tell}dir what I did for stat before.
115: The glibc compatibility part is currently non-functional.
116: fixed white space handling in sscanf " (" would not match " (".
117: fixed printf to accept 'l' flag.
118: fixed getpwuid (ignored last line)
119:
120: 0.6.8:
121: Olaf contributed initial thread-safe syscalls for i386, alpha, sparc,
122: mips and arm. I did the one for ppc. They can be enabled in dietfeatures.h.
123: added strlcpy and strlcat from OpenBSD.
124: added stat64, fstat64 and lstat64.
125: added endian.h and made ending of strlen.c endianness-aware
126: added string routines size tweak to dietfeatures.h. Most of the
127: string routines have been unrolled. This is up to three times as
128: fast but creates up to three times larger code. Now you can disable
129: the unrolling.
130: added sendfile.
131: I also added pread. It works on x86 and sparc but not on ppc and mips.
132: I have no idea what's going on. strace disagrees with the kernel.
133: Can anyone help? I asked the Linux kernel mailing list for help, too.
134: added a few aliases of the type __libc_open for open. nm on
135: libpthreads.so indicates that we will need them.
136:
137: 0.6.7:
138: the sources now compile without warnings with -Wall.
139: printf now prints "(null)" when %s is passed NULL. This can be
140: removed with WANT_NULL_PRINTF in dietfeatures.h
141: added vfprintf, execl, ttyname.
142: stat, lstat and fstat are now #defined to __dietstat, __dietlstat and
143: __dietfstat so they can use the normal kernel struct stat.
144: stat, lstat and fstat are now C wrappers that convert to the glibc
145: struct stat. So we can avoid that overhead for programs that use
146: dietlibc headers.
147:
148: 0.6.6:
149: changed the Makefiles so you can now set CFLAGS on the command line
150: added memccmp (analogous to memccpy) and strncmp.
151: Olaf fixed another bug in the sparc unified syscall.
152: Paul Clifford contributed a C version of his strlen.S that is much
153: more efficient than the previous strlen on all platforms! It also
154: looks like technology from Roswell. ;-}
155: added a "real" stdio. Well, almost. Please contribute!
156: added dietfeatures.h so you can remove features you don't need.
157: removed debug code from vsnprintf that changed \0 to ' ' (argh!).
158: stdio now works with simple programs and minigzip from libz.
159: stdio uses some major trickery to avoid linking the stdio, stderr and
160: stdout (and reserving space for them) when they are not used.
161:
162: 0.6.5:
163: Red Plait <redplait@ixcelerator.com> found several bugs in diet libc,
164: most of them bugs in the new header files, but also missing sigset
165: functions.
166: Paul Clifford contributed an assembly strlen.S for ARM and fixed
167: several bugs.
168: Fixed ppc/setjmp and mips/pipe.
169: Olaf contributed a new sparc unified syscall.
170:
171: 0.6.4:
172: declared is* static inline in getservent.
173: added assert_fail, strtoul, isalpha, isdigit, isalnum, isascii.
174: changed strlen to return 0 when passed NULL.
175: new, much smaller unified syscall for MIPS. Thanks to Olaf the Mad
176: Scientist who actually implemented this without access to a MIPS
177: box, just from reading the architecture manual. And it worked out
178: of the box.
179: started a set of system includes, mainly so that I can use lcc and
180: my alpha-linux cross compiler (which is unable to cross-compile
181: glibc). diet libc can now be compiled without any include files
182: from a normal libc. The includes do declare more than diet libc
183: currently delivers and they are still far from complete for real
184: applications.
185: I will only add assembly versions that are smaller _and_ faster than
186: the C version. Larger routines are only accepted if they are called
187: very often and are substantially faster.
188: added i386 assembly strchr, which is smaller and faster than the old
189: version. It is, however, larger than the version contributed by
190: proton (thanks, anyway).
191: added i386 strlen (31% faster, 14% smaller)
192: "make t" will now create a map file called "mapfile".
193:
194: 0.6.3:
195: added sys_errlist, strerror and perror
196: added isblank
197: added atol
198:
199: 0.6.2:
200: mmap for ARM didn't compile. Thanks, Paul!
201:
202: 0.6.1:
203: split mmap into the architecture specific subdirectories.
204: getenv now copes with environ==NULL, thanks Paul Clifford.
205: Paul also contributed a smaller ARM startup code.
206:
207: 0.6:
208: strcat returned the wrong result. Thanks, Dietz Pröpper.
209: strtod now understands a negative exponent (oops, thanks Bertram Barth)
210: Port to arm-linux-gnu, but on the Netwinder I use for testing the
211: __dtostr does not work (I have no idea why!)
212: The MIPS port now uses (much smaller) non-PIC code. That means that
213: the applications you link against diet libc also have to be compiled
214: non-PIC. I suggest copying the CFLAGS from the diet libc Makefile.
215: Thanks to Ralf Bächle for helping me with this!
216: I made subdirectories for the architectures and use VPATH to override
217: VPATH so that make finds the source file automatically. That should
218: simplify the sources greatly.
219: Olaf Dreesen contributed Alpha support including setjmp and longjmp!
220: ARM and MIPS now also have setjmp and longjmp
221: "compile" and "load" are now make targets. Use them for djb programs.
222: added contrib/elftrunc.c which will remove unnecessary ELF headers.
223: Again, contributed from Olaf. Great work!
224:
225: 0.5.12:
226: printf also does signed numbers.
227: If you don't use atexit, dietlibc now does not link exit, only _exit.
228: *printf now correctly returns the number of bytes written.
229: Olaf contributed experimental sscanf and vsscanf implementations.
230: If passed NULL as buffer, snprintf will not write anything but still
231: return the number of bytes it would have written.
232: Initial MIPS port! (Oh, the agony!)
233: No setjmp and longjmp support yet! Please contribute!
234: I even implemented unified syscalls for MIPS. Still, MIPS code is
235: almost twice the size of SPARC code. If anyone knows why: please
236: tell me!
237:
238: 0.5.11:
239: I implemented new unified syscalls for x86, sparc and ppc, this time based
240: on .s files and not .c files, and I moved the syscalls into
241: subdirectores to clean the dietlibc sources up a little.
242: A binary consisting of printf("%s is %d\n","olaf",23) is now
243: 2864 bytes on sparc
244: 2488 bytes on intel
245: I kludgily implemented fprintf(stdout,... and fprintf(stderr,...
246: to make a few more applications work.
247: Olaf Dreesen also implemented some unified syscall stuff for x86.
248: He discovered that with our unified syscall interface it actually
249: costs <10 bytes total to make all system calls thread safe!
250: I implemented atexit() (can register up to 4 callbacks).
251: I implemented strtod and __dtostr (the opposite). Now we can add
252: floating point support to vsnprintf and sscanf!
253:
254: 0.5.10:
255: I actually saw that I can not only merge the errno handling code of
256: the system calls on x86, I can also merge the rest (including the
257: arguments) except for setting the system call number. All those
258: system calls are now just a jump to a unified system call handler.
259: I got rid of x86openclose again. The savings are substantial:
260: chown from embutils went from 7664 to 7184 bytes!
261: If I'd move the system call wrappers to assembly language, I could
262: even reduce the alignment (does not matter since it's just a jump
263: anyway) and get rid of the "ret" behind each jump (one byte per
264: system call!)
265:
266: 0.5.9:
267: added memchr, strpbrk, strstr, strtol, isspace (hehe)
268: fixed strdup
269: fixed return values for strcpy and strcat (thanks to Norbert Berzen)
270: Olaf Dreesen contributed a strtol and initial {sn|vsn|}printf implementation
271: (no signed integers, only strings and unsigned integers (but
272: supporting octal, hex and decimal). Thanks, Olaf! (by the way:
273: that code must be wonderful, I don't understand it at all *bg*)
274: Olaf's printf does understand padding like in "%08d" and "%8d" and
275: automatically pads pointers with '0'.
276: Rewrote the x86 start code, old: 22 instructions, new: 12 instructions.
277: Thanks to proton for inspiration on this.
278: The new x86 start code also does not reference exit any more, thus saving
279: 64 bytes for executables that don't call exit explicitly.
280: [insert maniacal laughter] EVERY BYTE COUNTS!1!! ;-)
281: Moved errno and environ to start.S, saving no byte binary size but
282: speeding up compilation and slightly shortening dietlibc.a ;-)
283: For x86: joined open and close into one assembler file, sharing the
284: errno handling. This is a feasibility test and it actually saves a
285: few bytes. I think I will reimplement the _syscall[1-6] macros on
286: all platforms now to share the errno handling code for them.
287:
288: 0.5.8:
289: fixed strchr to be able to look for 0.
290:
291: added _llseek, ftruncate, getpgid, getresgid, getresuid, getsid,
292: memccpy, memmove, mprotect, setregid, setresgid, setresuid, setreuid,
293: strncpy, swapon, truncate, strtok, strtok_r, strspn, strcspn (all
294: contributed by Olaf Dreesen)
295:
296: added execvp, getcwd
297:
298: fixed __xmknod
299:
300: Note: can it be that the ftw interface really is so broken that I
301: cannot implement it without having to implement some searching data
302: structure? I included an experimental ftw implementation that will
303: not follow symlinks.
304:
305: 0.5.7:
306: oops, if_nametoindex was broken!
307:
308: 0.5.6:
309: ported to ppc-linux.
310: fixed i386 sigsetjmp (I mistyped the function name)
311: included sigjmp.c
312:
313: 0.5.5:
314: added wait, sys_siglist, longjmp/setjmp/sigsetjmp for i386 and sparc
315: actually, it wasn't fork that wasn't working for sparc, it was pipe.
316: I fixed it now.
317: dietlibc/SPARC assumes -msupersparc (does not provide div, mul, etc)
318: fixed readdir to use getdents and not the intel inline asm
319:
320: 0.5.4:
321: ported to sparclinux (sparc32 only). Beware: does not work yet.
322: added raise, abort, readlink, strcat, geteuid, geteuid, wait3, access
323:
324: 0.5.3:
325: added tcsetattr and getenv to compile e3
326:
327: 0.5.2:
328: added vhangup, tcgetattr, isatty and memcmp for fgetty
329: (http://www.fefe.de/fgetty/)
330: added localtime from uC-libc.
331:
332: 0.5.1:
333: stat and friends actually work now. Yuck! Another case of
334: translation between kernel and userland. Why can't the kernel
335: people and the libc people simply agree on a standard?
336: removed many unnecessary includes to speed up compilation.
337: added -fomit-frame-pointer and i386 compilation target to reduce code size.
338: inlined socketcall to reduce code size.
339: "load" and "compile" are examples for djb code.
340:
341: 0.5:
342: Olaf Dreesen contributed a much smaller implementation of malloc and friends.
343: each object file is now treated with "strip -x -R .note -R .comment"
344: split each system call into a separate object file
345: added ntohs, htons, alarm, if_indextoname and if_nametoindex
346:
347: 0.4.1:
348: oops, the strchr implementation was wrong. Thanks Jens Laas!
349:
350: 0.4:
351: copied opendir and friends from uC-libc.
352: added getservent and getservby* in gerservent.c
353:
354: 0.3:
355: remove readdir system call
356: added getdents system call
357: added getpwnam/getpwuid implementation in getpwnam.c
358: added a few string functions (in str*.c)
359:
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