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| author | Siddhesh Poyarekar <siddhesh@redhat.com> | 2014-05-27 13:54:19 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2014-05-27 13:54:19 +0530 |
| commit | 2482ae433a4249495859343ae1fba408300f2c2e (patch) | |
| tree | 9fdaad4e75acb1672022be1c49862ee726134bd9 /libio/Makefile | |
| parent | bab900166e8b5f0f4081c5cf1afa0cd33b123714 (diff) | |
| download | glibc-2482ae433a4249495859343ae1fba408300f2c2e.zip glibc-2482ae433a4249495859343ae1fba408300f2c2e.tar.gz glibc-2482ae433a4249495859343ae1fba408300f2c2e.tar.bz2 | |
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
Diffstat (limited to 'libio/Makefile')
| -rw-r--r-- | libio/Makefile | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libio/Makefile b/libio/Makefile index cca0345..b324ccc 100644 --- a/libio/Makefile +++ b/libio/Makefile @@ -60,7 +60,8 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \ tst-wmemstream1 tst-wmemstream2 \ bug-memstream1 bug-wmemstream1 \ tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos tst-fseek \ - tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler + tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler \ + tst-ftell-append ifeq (yes,$(build-shared)) # Add test-fopenloc only if shared library is enabled since it depends on # shared localedata objects. @@ -160,6 +161,7 @@ tst-fgetwc-ENV = LOCPATH=$(common-objpfx)localedata tst-fseek-ENV = LOCPATH=$(common-objpfx)localedata tst-ftell-partial-wide-ENV = LOCPATH=$(common-objpfx)localedata tst-ftell-active-handler-ENV = LOCPATH=$(common-objpfx)localedata +tst-ftell-append-ENV = LOCPATH=$(common-objpfx)localedata generated += tst-fopenloc.mtrace tst-fopenloc.check |