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| author | Siddhesh Poyarekar <siddhesh@redhat.com> | 2014-05-27 13:54:19 +0530 |
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| committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2014-05-27 13:54:19 +0530 |
| commit | 2482ae433a4249495859343ae1fba408300f2c2e (patch) | |
| tree | 9fdaad4e75acb1672022be1c49862ee726134bd9 /rt/tst-aio6.c | |
| 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 'rt/tst-aio6.c')
0 files changed, 0 insertions, 0 deletions