Package: libc6
Version: 2.11.2-1
Severity: normal
For fprintf (thus printf), the C standard says:
The fprintf function returns the number of characters transmitted,
or a negative value if an output or encoding error occurred.
But in glibc, printf doesn't return a negative value in case of output
error (at least not in some cases). For instance:
#include <stdio.h>
int main (void)
{
int r;
r = printf ("%10000s\n", "foo");
fprintf (stderr, "%d\n", r);
return 0;
}
Then I get:
$ ./out > /dev/null
10001
$ ./out >&-
8196
The first case is correct (anything can be written to /dev/null),
but in the second case (where the fd is closed), there's obviously
an output error (the return value is not 10001), but in such a case,
r should have been negative.
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/8 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.ISO8859-1 (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/dash
Versions of packages libc6 depends on:
ii libc-bin 2.11.2-1 Embedded GNU C Library: Binaries
ii libgcc1 1:4.4.4-5 GCC support library
libc6 recommends no packages.
Versions of packages libc6 suggests:
ii debconf [debconf-2.0] 1.5.32 Debian configuration management sy
ii glibc-doc 2.11.2-1 Embedded GNU C Library: Documentat
ii locales 2.11.2-1 Embedded GNU C Library: National L
-- debconf information:
glibc/upgrade: true
glibc/disable-screensaver:
glibc/restart-failed:
* glibc/restart-services: gdm exim4 cups cron atd
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