* [Bug libc/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
@ 2011-10-27 2:08 ` bugdal at aerifal dot cx
2011-10-27 2:08 ` bugdal at aerifal dot cx
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From: bugdal at aerifal dot cx @ 2011-10-27 2:08 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
Rich Felker <bugdal at aerifal dot cx> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
CC| |bugdal at aerifal dot cx
Resolution|WORKSFORME |
--- Comment #6 from Rich Felker <bugdal at aerifal dot cx> 2011-10-27 02:07:43 UTC ---
This bug still exists; I'm reopening it and adding a new attachment that
demonstrates it trivially. Actually I wrote this test-case a while back as a
demonstration of one of the very few safe uses of gets(), which happened to
become unsafe due to the bug in glibc.
To see the bug, run the program (stdio_eof.c) and press ^D (or whatever your
EOF key on the terminal is). The program should exit, but under glibc, the
gets() call waits for a line of input and prints it back before exiting.
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug libc/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
2011-10-27 2:08 ` [Bug libc/1190] fgetc()/fread() behaviour is not POSIX compliant bugdal at aerifal dot cx
@ 2011-10-27 2:08 ` bugdal at aerifal dot cx
2011-11-04 18:31 ` gotom at debian dot or.jp
` (8 subsequent siblings)
10 siblings, 0 replies; 11+ messages in thread
From: bugdal at aerifal dot cx @ 2011-10-27 2:08 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
--- Comment #7 from Rich Felker <bugdal at aerifal dot cx> 2011-10-27 02:08:30 UTC ---
Created attachment 6036
--> http://sourceware.org/bugzilla/attachment.cgi?id=6036
Tiny test-case showing the bug.
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug libc/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
2011-10-27 2:08 ` [Bug libc/1190] fgetc()/fread() behaviour is not POSIX compliant bugdal at aerifal dot cx
2011-10-27 2:08 ` bugdal at aerifal dot cx
@ 2011-11-04 18:31 ` gotom at debian dot or.jp
2012-02-21 1:33 ` [Bug stdio/1190] " jsm28 at gcc dot gnu.org
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From: gotom at debian dot or.jp @ 2011-11-04 18:31 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
GOTO Masanori <gotom at debian dot or.jp> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gotom at debian dot or.jp
AssignedTo|gotom at debian dot or.jp |drepper.fsp at gmail dot
| |com
--- Comment #8 from GOTO Masanori <gotom at debian dot or.jp> 2011-11-04 18:31:35 UTC ---
It looks like "end-of-file" condition is cleared when gets() called (which
should be preserved according to the standard), like:
#include <stdio.h>
int main(void) {
char buf[100];
gets(buf); // We need to type ^D
gets(buf); // We need to type ^D but the stream already received ^D
(end-of-file condition)
}
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[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (2 preceding siblings ...)
2011-11-04 18:31 ` gotom at debian dot or.jp
@ 2012-02-21 1:33 ` jsm28 at gcc dot gnu.org
2012-02-21 2:01 ` funtoos at yahoo dot com
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From: jsm28 at gcc dot gnu.org @ 2012-02-21 1:33 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|libc |stdio
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug stdio/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (3 preceding siblings ...)
2012-02-21 1:33 ` [Bug stdio/1190] " jsm28 at gcc dot gnu.org
@ 2012-02-21 2:01 ` funtoos at yahoo dot com
2012-03-17 20:34 ` bugdal at aerifal dot cx
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From: funtoos at yahoo dot com @ 2012-02-21 2:01 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
--- Comment #9 from Sunil <funtoos at yahoo dot com> 2012-02-21 01:41:06 UTC ---
Can't believe its almost 7 yrs since I opened this bug. And it still
exists...:)
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug stdio/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (4 preceding siblings ...)
2012-02-21 2:01 ` funtoos at yahoo dot com
@ 2012-03-17 20:34 ` bugdal at aerifal dot cx
2012-03-18 14:23 ` jsm28 at gcc dot gnu.org
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From: bugdal at aerifal dot cx @ 2012-03-17 20:34 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
--- Comment #10 from Rich Felker <bugdal at aerifal dot cx> 2012-03-17 20:34:20 UTC ---
Ping. Now that there's a new willingness to fix longstanding glibc bugs, please
examine this report again.
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug stdio/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (5 preceding siblings ...)
2012-03-17 20:34 ` bugdal at aerifal dot cx
@ 2012-03-18 14:23 ` jsm28 at gcc dot gnu.org
2012-09-13 13:33 ` siddhesh at redhat dot com
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From: jsm28 at gcc dot gnu.org @ 2012-03-18 14:23 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|drepper.fsp at gmail dot |unassigned at sourceware
|com |dot org
--- Comment #11 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-03-18 14:20:03 UTC ---
This report appears to be correct and still present in current sources (tested
x86_64).
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug stdio/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (6 preceding siblings ...)
2012-03-18 14:23 ` jsm28 at gcc dot gnu.org
@ 2012-09-13 13:33 ` siddhesh at redhat dot com
2012-09-13 13:52 ` siddhesh at redhat dot com
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From: siddhesh at redhat dot com @ 2012-09-13 13:33 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
Siddhesh Poyarekar <siddhesh at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |ASSIGNED
CC| |siddhesh at redhat dot com
AssignedTo|unassigned at sourceware |siddhesh at redhat dot com
|dot org |
--- Comment #12 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2012-09-13 13:32:49 UTC ---
I'll take a crack at this.
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug stdio/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (7 preceding siblings ...)
2012-09-13 13:33 ` siddhesh at redhat dot com
@ 2012-09-13 13:52 ` siddhesh at redhat dot com
2012-09-13 14:15 ` siddhesh at redhat dot com
2022-09-23 5:25 ` fweimer at redhat dot com
10 siblings, 0 replies; 11+ messages in thread
From: siddhesh at redhat dot com @ 2012-09-13 13:52 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
--- Comment #13 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2012-09-13 13:52:06 UTC ---
The change is quite simple, but a comment in fileops.c says that this behaviour
is retained for sysv compatibility:
...
int
_IO_new_file_underflow (fp)
_IO_FILE *fp;
{
_IO_ssize_t count;
#if 0
/* SysV does not make this test; take it out for compatibility */
if (fp->_flags & _IO_EOF_SEEN)
return (EOF);
#endif
...
I'm not sure if this is valid anymore, so I'll try to find out what the current
status is, unless someone here already knows the answer.
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^ permalink raw reply [flat|nested] 11+ messages in thread* [Bug stdio/1190] fgetc()/fread() behaviour is not POSIX compliant
[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (8 preceding siblings ...)
2012-09-13 13:52 ` siddhesh at redhat dot com
@ 2012-09-13 14:15 ` siddhesh at redhat dot com
2022-09-23 5:25 ` fweimer at redhat dot com
10 siblings, 0 replies; 11+ messages in thread
From: siddhesh at redhat dot com @ 2012-09-13 14:15 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=1190
--- Comment #14 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2012-09-13 14:14:36 UTC ---
The discussion can be followed (and contributed to) here:
http://sourceware.org/ml/libc-alpha/2012-09/msg00343.html
I am currently of the opinion that this change may break a lot of existing
programs and hence this fix may not be a good idea.
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[not found] <bug-1190-131@http.sourceware.org/bugzilla/>
` (9 preceding siblings ...)
2012-09-13 14:15 ` siddhesh at redhat dot com
@ 2022-09-23 5:25 ` fweimer at redhat dot com
10 siblings, 0 replies; 11+ messages in thread
From: fweimer at redhat dot com @ 2022-09-23 5:25 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=1190
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=29601
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