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2482ae433a
glibc/libio
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Siddhesh Poyarekar 2482ae433a Fix offset computation for append+ mode on switching from read (BZ #16724) 
The offset computation in write mode uses the fact that _IO_read_end
is kept in sync with the external file offset.  This however is not
true when O_APPEND is in effect since switching to write mode ought to
send the external file offset to the end of file without making the
necessary adjustment to _IO_read_end.

Hence in append mode, offset computation when writing should only
consider the effect of unflushed writes, i.e. from _IO_write_base to
_IO_write_ptr.

The wiki has a detailed document that describes the rationale for
offsets returned by ftell in various conditions:

https://sourceware.org/glibc/wiki/File%20offsets%20in%20a%20stdio%20stream%20and%20ftell
2014-05-27 13:54:19 +05:30
..
bits Complete _BSD_SOURCE / _SVID_source followup cleanup. 2014-02-21 21:45:26 +00:00
__fbufsize.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__flbf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__fpending.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__fpurge.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__freadable.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__freading.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__fsetlocking.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__fwritable.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
__fwriting.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
bug-fopena+.c
bug-fseek.c
bug-ftell.c
bug-memstream1.c
bug-mmap-fflush.c
bug-rewind2.c
bug-rewind.c
bug-ungetc2.c
bug-ungetc3.c
bug-ungetc4.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
bug-ungetc.c
bug-ungetwc1.c
bug-ungetwc2.c
bug-wfflush.c
bug-wmemstream1.c
bug-wsetpos.c Fix fsetpos on wide stream. 2009-09-02 19:45:33 -07:00
clearerr_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
clearerr.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Depend
fcloseall.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feof_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feof.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ferror_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ferror.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
filedoalloc.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
fileno.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fileops.c Fix offset computation for append+ mode on switching from read (BZ #16724) 2014-05-27 13:54:19 +05:30
fmemopen.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
fputc_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fputc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fputwc_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fputwc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
freopen64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
freopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fseek.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fseeko64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fseeko.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ftello64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ftello.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fwide.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fwprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fwscanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
genops.c Revert "Fix _IO_JUMPS_OFFSET -Wundef warnings" 2014-03-17 20:37:42 +00:00
getc_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
getc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
getchar_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
getchar.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
getwc_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
getwc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
getwchar_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
getwchar.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofclose.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofdopen.c Change offset in fdopen only if setting O_APPEND 2014-03-17 21:24:02 +05:30
iofflush_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofflush.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofgetpos64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofgetpos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofgets_u.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
iofgets.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
iofgetws_u.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
iofgetws.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
iofopen64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofopncook.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofputs_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofputs.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofputws_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofputws.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofread_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofread.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofsetpos64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofsetpos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ioftell.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofwide.c Use cached offset in ftell when reliable 2014-03-04 12:23:28 +05:30
iofwrite_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iofwrite.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iogetdelim.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
iogetline.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iogets.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iogetwline.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iolibio.h Remove use of INTDEF/INTUSE in libio 2012-05-24 23:06:20 +02:00
iopadn.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iopopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ioputs.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ioseekoff.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ioseekpos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iosetbuffer.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iosetvbuf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ioungetc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ioungetwc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iovdprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iovsprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iovsscanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iovswscanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
iowpadn.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
libc_fatal.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
libio.h Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
libioP.h Fix -Wundef warnings for _IO_JUMPS_OFFSET. 2014-05-01 13:33:13 -07:00
Makefile Fix offset computation for append+ mode on switching from read (BZ #16724) 2014-05-27 13:54:19 +05:30
memstream.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
obprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldfileops.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiofclose.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiofdopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiofgetpos64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiofgetpos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiofopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiofsetpos64.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiofsetpos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldiopopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldpclose.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldstdfiles.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
oldtmpfile.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
pclose.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
peekc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putc_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putchar_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putchar.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putwc_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putwc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putwchar_u.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
putwchar.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
rewind.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
setbuf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
setlinebuf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
stdfiles.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
stdio.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
stdio.h Complete _BSD_SOURCE / _SVID_source followup cleanup. 2014-02-21 21:45:26 +00:00
strfile.h Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
strops.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
swprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
swscanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-fmemopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-freopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-freopen.sh Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst_getwc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst_getwc.input
tst_putwc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst_swprintf.c
tst_swscanf.c
tst_wprintf2.c
tst_wprintf.c
tst_wscanf.c
tst_wscanf.input
tst-atime.c
tst-eof.c
tst-ext2.c
tst-ext.c
tst-fgetwc.c (do_test): Use de_DE.UTF-8 as locale name. 2009-06-15 17:27:48 -07:00
tst-fgetwc.input
tst-fgetws.c
tst-fopenloc2.c
tst-fopenloc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-freopen.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-fseek.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-ftell-active-handler.c Change offset in fdopen only if setting O_APPEND 2014-03-17 21:24:02 +05:30
tst-ftell-append.c Fix offset computation for append+ mode on switching from read (BZ #16724) 2014-05-27 13:54:19 +05:30
tst-ftell-partial-wide.c Fix infinite loop in ftell when writing wide char data (BZ #16398) 2014-02-05 12:49:00 +05:30
tst-fwrite-error.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-memstream1.c
tst-memstream2.c
tst-mmap2-eofsync.c
tst-mmap-eofsync.c
tst-mmap-fflushsync.c
tst-mmap-offend.c
tst-mmap-setvbuf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-popen1.c
tst-setvbuf1.c
tst-sscanf.c
tst-swscanf.c
tst-ungetwc1.c
tst-ungetwc2.c
tst-widetext.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-widetext.input Rename Oriya locale to Odia (bug 15601) 2013-11-20 17:47:41 +05:30
tst-wmemstream1.c
tst-wmemstream2.c
vasprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Versions Remove mention of open_obstack_stream, which has never existed in libio. 2011-10-26 16:53:02 -07:00
vscanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
vsnprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
vswprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
vwprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
vwscanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
wfiledoalloc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
wfileops.c Fix offset computation for append+ mode on switching from read (BZ #16724) 2014-05-27 13:54:19 +05:30
wgenops.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
wmemstream.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
wprintf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
wscanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
wstrops.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00