Commit Graph

13 Commits

Author SHA1 Message Date
FRIGN
11e2d472bf Add *fshut() functions to properly flush file streams
This has been a known issue for a long time. Example:

printf "word" > /dev/full

wouldn't report there's not enough space on the device.
This is due to the fact that every libc has internal buffers
for stdout which store fragments of written data until they reach
a certain size or on some callback to flush them all at once to the
kernel.
You can force the libc to flush them with fflush(). In case flushing
fails, you can check the return value of fflush() and report an error.

However, previously, sbase didn't have such checks and without fflush(),
the libc silently flushes the buffers on exit without checking the errors.
No offense, but there's no way for the libc to report errors in the exit-
condition.

GNU coreutils solve this by having onexit-callbacks to handle the flushing
and report issues, but they have obvious deficiencies.
After long discussions on IRC, we came to the conclusion that checking the
return value of every io-function would be a bit too much, and having a
general-purpose fclose-wrapper would be the best way to go.

It turned out that fclose() alone is not enough to detect errors. The right
way to do it is to fflush() + check ferror on the fp and then to a fclose().
This is what fshut does and that's how it's done before each return.
The return value is obviously affected, reporting an error in case a flush
or close failed, but also when reading failed for some reason, the error-
state is caught.

the !!( ... + ...) construction is used to call all functions inside the
brackets and not "terminating" on the first.
We want errors to be reported, but there's no reason to stop flushing buffers
when one other file buffer has issues.
Obviously, functionales come before the flush and ret-logic comes after to
prevent early exits as well without reporting warnings if there are any.

One more advantage of fshut() is that it is even able to report errors
on obscure NFS-setups which the other coreutils are unable to detect,
because they only check the return-value of fflush() and fclose(),
not ferror() as well.
2015-04-05 09:13:56 +01:00
FRIGN
a20a9350db Audit uuencode(1)
Style cleanup, Manpage refactoring.
2015-03-18 00:14:56 +01:00
Hiltjo Posthuma
31f0624f3d code-style: minor cleanup and nitpicking 2015-02-20 13:29:38 +01:00
FRIGN
31572c8b0e Clean up #includes 2015-02-14 21:12:23 +01:00
sin
d61add5dee uuencode: Style fix 2015-02-13 11:20:22 +00:00
Tai Chi Minh Ralph Eastwood
b907e8747d uuencode: refactor by removing extranous #include 2015-02-13 11:20:22 +00:00
Tai Chi Minh Ralph Eastwood
ec02816d3e uuencode: add support for base64 and -o to stdout 2015-02-13 11:20:21 +00:00
FRIGN
eee98ed3a4 Fix coding style
It was about damn time. Consistency is very important in such a
big codebase.
2014-11-13 18:08:43 +00:00
sin
0c5b7b9155 Stop using EXIT_{SUCCESS,FAILURE} 2014-10-02 23:46:59 +01:00
sin
31894adad2 Use printf() instead of fprintf() in uuencode(1) 2014-01-31 15:55:38 +00:00
sin
cb5733ea41 Make the buffer 45 bytes exactly for uuencode(1) 2014-01-31 15:45:26 +00:00
sin
b60882f206 Use putchar() instead of fputc() in uuencode(1) 2014-01-31 15:44:00 +00:00
sin
aab53ef197 Add uuencode(1) 2014-01-31 15:29:11 +00:00