isatty bug

isatty bug

[Sam Steingold]

calling isatty(0) in a program results in a segfault:

Exception: STATUS_ACCESS_VIOLATION at eip=00000000
eax=00000000 ebx=00000004 ecx=610CEE30 edx=610CEE18 esi=004073B8 edi=0022FECC
ebp=00000400 esp=0022FE00 program=d:\sds\c\scratch.exe
cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
Stack trace:
Frame     Function  Args
End of stack trace

calling isatty(0) in gdb results in a segfault too:

Exception: STATUS_ACCESS_VIOLATION at eip=610B7374
eax=00000010 ebx=00000010 ecx=00000004 edx=00000000 esi=D0105E51 edi=100F7240
ebp=0022F178 esp=0022F16C program=d:\gnu\cygwin\bin\gdb.exe
cs=001B ds=0023 es=0023 fs=0038 gs=0000 ss=0023
Stack trace:
Frame     Function  Args
0022F178  610B7374  (100F7240, D0105E51, 00000010, 000005EC)
0022F1A8  004A767A  (100F7178, 00000020, D0105E51, 004C26D8)
0022F1C8  004A75C1  (00000020, D0105E51, 00000000, 00000000)
0022F1E8  004B6175  (00000020, 00000000, 00000000, 000005EC)
0022F218  004A5B8D  (100F7178, 00000020, 0022F270, 10292E34)
0022F238  004A5085  (100F7178, 00000020, 0022F270, 0042EF07)
0022F298  004A4F14  (102CB4A8, 004A5050, 100F7178, 0042EF59)
0022F2B8  004A51C5  (102CB4A8, 100F7178, 0022F2E8, 0042DDC0)
0022F2E8  004A5403  (100F7178, FFFFFFE2, 0022F3A8, 004D1F07)
0022F2F8  0049B0A5  (00000001, 61602144, 0022F330, 00A00088)
0022F3A8  004D1F07  (101DBAE8, 00000001, 0022F3DC, 00446EB4)
0022F648  0044712F  (00000000, 102AE3D8, 0022F684, 00000000)
0022F668  004443F6  (00000000, 102AE3D8, 0022F684, 00000000)
0022F688  0044461F  (102AE3D8, 0022F6B8, 00000000, 00000000)
0022F6C8  0047D269  (100C050A, 00000000, 00000001, 00000001)
0022F6E8  0047D2E1  (100C050A, 00000001, 0022F718, 00407A8C)
End of stack trace (more stack frames may be present)



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<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
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Re: isatty bug

[Corinna Vinschen]

On Mon, Sep 15, 2003 at 05:19:16PM -0400, Sam Steingold wrote:
> calling isatty(0) in a program results in a segfault:

And the version number of the DLL is ...
Fd 0 is a tty, a console window, a tape drive, a ...
Reproducible testcase is ...

http://cygwin.com/problems.html

I've tested with 1.5.[234] and current CVS, with fd 0 being a tty and a
console window.  No segv.

Corinna

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Re: isatty bug

[Sam Steingold]

>* Corinna Vinschen <pbevaan-pltjva@pltjva.pbz> [2003-09-16 12:01:08 +0200]:
>
> On Mon, Sep 15, 2003 at 05:19:16PM -0400, Sam Steingold wrote:
> > calling isatty(0) in a program results in a segfault:
> And the version number of the DLL is ...

1.5.4(0.94/3/2)

> Fd 0 is a tty, a console window, a tape drive, a ...

I am doing this in a windows console, as created by clicking on the
cygwin icon, i.e., in the bash shell.
I assume that 0 means stdin.

> Reproducible testcase is ...

------- scratch.c ----
#include <stdio.h>
int main (void) {
#define Y_N(x)  ((x) ? "(TTY)" : "(not a TTY)")
  printf("0: %s %s\n1: %s %s\n2: %s %s\n",
         ttyname(0),Y_N(isatty(0)),ttyname(1),Y_N(isatty(1)),
         ttyname(2),Y_N(isatty(2)))
#undef Y_N
  return 0;
}
------- scratch.c ----


$ gdb scratch
GNU gdb 2003-09-02-cvs (cygwin-special)
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i686-pc-cygwin"...
(gdb) run tty
Starting program: /cygdrive/d/sds/c/scratch.exe tty

Program received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? () from
(gdb) where
#0  0x00000000 in ?? () from
(gdb) p isatty(1)
Segmentation fault (core dumped)
$

same for ttyname(0) &c.

-- 
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<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
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Re: isatty bug

[Christopher Faylor]

On Tue, Sep 16, 2003 at 10:42:49AM -0400, Sam Steingold wrote:
>>* Corinna Vinschen <pbevaan-pltjva@pltjva.pbz> [2003-09-16 12:01:08 +0200]:
>>
>> On Mon, Sep 15, 2003 at 05:19:16PM -0400, Sam Steingold wrote:
>> > calling isatty(0) in a program results in a segfault:
>> And the version number of the DLL is ...
>
>1.5.4(0.94/3/2)
>
>> Fd 0 is a tty, a console window, a tape drive, a ...
>
>I am doing this in a windows console, as created by clicking on the
>cygwin icon, i.e., in the bash shell.
>I assume that 0 means stdin.
>
>> Reproducible testcase is ...
>
>------- scratch.c ----
>#include <stdio.h>
>int main (void) {
>#define Y_N(x)  ((x) ? "(TTY)" : "(not a TTY)")
>  printf("0: %s %s\n1: %s %s\n2: %s %s\n",
>         ttyname(0),Y_N(isatty(0)),ttyname(1),Y_N(isatty(1)),
>         ttyname(2),Y_N(isatty(2)))
>#undef Y_N
>  return 0;
>}
>------- scratch.c ----

Fixing the obvious typo in the above provides the desired results both
inside gdb and outside gdb.  With CYGWIN=tty and with CYGWIN=notty.

So, I can't duplicate this problem.

cgf

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Re: isatty bug

[Sam Steingold]

> * Christopher Faylor <pts-epz@pltjva.pbz> [2003-09-16 13:19:51 -0400]:
>
> On Tue, Sep 16, 2003 at 10:42:49AM -0400, Sam Steingold wrote:
> >>* Corinna Vinschen <pbevaan-pltjva@pltjva.pbz> [2003-09-16 12:01:08 +0200]:
> >>
> >> On Mon, Sep 15, 2003 at 05:19:16PM -0400, Sam Steingold wrote:
> >> > calling isatty(0) in a program results in a segfault:
> >> And the version number of the DLL is ...
> >
> >1.5.4(0.94/3/2)
> >
> >> Fd 0 is a tty, a console window, a tape drive, a ...
> >
> >I am doing this in a windows console, as created by clicking on the
> >cygwin icon, i.e., in the bash shell.
> >I assume that 0 means stdin.
> >
> >> Reproducible testcase is ...
> >
> >------- scratch.c ----
> >#include <stdio.h>
> >int main (void) {
> >#define Y_N(x)  ((x) ? "(TTY)" : "(not a TTY)")
> >  printf("0: %s %s\n1: %s %s\n2: %s %s\n",
> >         ttyname(0),Y_N(isatty(0)),ttyname(1),Y_N(isatty(1)),
> >         ttyname(2),Y_N(isatty(2)))
> >#undef Y_N
> >  return 0;
> >}
> >------- scratch.c ----
> 
> Fixing the obvious typo in the above provides the desired results both
> inside gdb and outside gdb.  With CYGWIN=tty and with CYGWIN=notty.

what is the "obvious typo"?

-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
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Re: isatty bug

[Igor Pechtchanski]

On Tue, 16 Sep 2003, Sam Steingold wrote:

> > * Christopher Faylor <pts-epz@pltjva.pbz> [2003-09-16 13:19:51 -0400]:
> >
> > On Tue, Sep 16, 2003 at 10:42:49AM -0400, Sam Steingold wrote:
> > >>* Corinna Vinschen <pbevaan-pltjva@pltjva.pbz> [2003-09-16 12:01:08 +0200]:
> > >>
> > >> On Mon, Sep 15, 2003 at 05:19:16PM -0400, Sam Steingold wrote:
> > >> > calling isatty(0) in a program results in a segfault:
> > >> And the version number of the DLL is ...
> > >
> > >1.5.4(0.94/3/2)
> > >
> > >> Fd 0 is a tty, a console window, a tape drive, a ...
> > >
> > >I am doing this in a windows console, as created by clicking on the
> > >cygwin icon, i.e., in the bash shell.
> > >I assume that 0 means stdin.
> > >
> > >> Reproducible testcase is ...
> > >
> > >------- scratch.c ----
> > >#include <stdio.h>
> > >int main (void) {
> > >#define Y_N(x)  ((x) ? "(TTY)" : "(not a TTY)")
> > >  printf("0: %s %s\n1: %s %s\n2: %s %s\n",
> > >         ttyname(0),Y_N(isatty(0)),ttyname(1),Y_N(isatty(1)),
> > >         ttyname(2),Y_N(isatty(2)))
                                        ^
> > >#undef Y_N
> > >  return 0;
> > >}
> > >------- scratch.c ----
> >
> > Fixing the obvious typo in the above provides the desired results both
> > inside gdb and outside gdb.  With CYGWIN=tty and with CYGWIN=notty.
>
> what is the "obvious typo"?

Aw, come on, try to at least *compile* the code you posted, will ya? ;-)
	Igor
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Re: isatty bug

[Sam Steingold]

> * Igor Pechtchanski <crpugpun@pf.alh.rqh> [2003-09-16 13:36:30 -0400]:
>
> > > >int main (void) {
> > > >#define Y_N(x)  ((x) ? "(TTY)" : "(not a TTY)")
> > > >  printf("0: %s %s\n1: %s %s\n2: %s %s\n",
> > > >         ttyname(0),Y_N(isatty(0)),ttyname(1),Y_N(isatty(1)),
> > > >         ttyname(2),Y_N(isatty(2)))
>                                         ^
> > > >#undef Y_N
> > > >  return 0;
> > > >}
> > >
> > > Fixing the obvious typo in the above provides the desired results both
> > > inside gdb and outside gdb.  With CYGWIN=tty and with CYGWIN=notty.
> >
> > what is the "obvious typo"?
>
> Aw, come on, try to at least *compile* the code you posted, will ya? ;-)

looks like my cut-and-paste is not as good as it was ... :-)

OK.

what about this:

int same_tty_p (int fd1, int fd2)
{
  struct stat stat1;
  struct stat stat2;
  return ((fstat(fd1,&stat1) >= 0) && (fstat(fd2,&stat2) >= 0) &&
          (stat1.st_dev == stat2.st_dev) && (stat2.st_ino == stat2.st_ino));
}


  printf("0/1: %d\n1/2: %d\n2/0: %d\n",same_tty_p(0,1),
         same_tty_p(1,2),same_tty_p(2,0));


I get crash both in program and gdb (i.e., gdb itself segfaults) on the
fstat() calls.

ps. I am missing "man fstat" - what package do I need for that?

--
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Re: isatty bug

[Igor Pechtchanski]

On Tue, 16 Sep 2003, Sam Steingold wrote:

> [snip]
> ps. I am missing "man fstat" - what package do I need for that?

I don't believe system call manpages are contained in any package (a
search on <http://cygwin.com/packages/> for "man2/" returns nothing).
Feel free to submit one.
	Igor
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Re: isatty bug

[Christopher Faylor]

On Tue, Sep 16, 2003 at 02:16:05PM -0400, Sam Steingold wrote:
>what about this:
>
>int same_tty_p (int fd1, int fd2)
>{
>  struct stat stat1;
>  struct stat stat2;
>  return ((fstat(fd1,&stat1) >= 0) && (fstat(fd2,&stat2) >= 0) &&
>          (stat1.st_dev == stat2.st_dev) && (stat2.st_ino == stat2.st_ino));
>}
>
>
>  printf("0/1: %d\n1/2: %d\n2/0: %d\n",same_tty_p(0,1),
>         same_tty_p(1,2),same_tty_p(2,0));
>
>
>I get crash both in program and gdb (i.e., gdb itself segfaults) on the
>fstat() calls.

Is it really that hard to produce working test cases that compile out of
the box?

Anyway, after adding a main and some include files the above, unsurprisingly,
works fine.

cgf

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Re: isatty bug

[Brian Ford]

Sam Steingold wrote:

> I get crash both in program and gdb (i.e., gdb itself segfaults) on the
> fstat() calls.
>
Sounds like you have 1.3.22 headers and a 1.5.x Cygwin DLL and import lib?

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Re: isatty bug

[Sam Steingold]

> * Brian Ford <sbeq@iff.sfv.pbz> [2003-09-16 13:35:58 -0500]:
>
> Sam Steingold wrote:
> 
> > I get crash both in program and gdb (i.e., gdb itself segfaults) on the
> > fstat() calls.
> >
> Sounds like you have 1.3.22 headers and a 1.5.x Cygwin DLL and import lib?

sounds too good to be true (a simple upgrade would then help, right?)
unfortunately, I did a clean install this weekend (rm -rf cygwin),
so I doubt that this is the case.
at any rate, how do I check for this?

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Re: isatty bug

[Brian Ford]

Was that stock Cygwin gdb that crashed?

Try this:

$ cat stest.c
#include <sys/types.h>
#include <sys/stat.h>

int same_tty_p (int fd1, int fd2)
{
  struct stat stat1, stat2;

  return (fstat(fd1, &stat1) >= 0 && fstat(fd2, &stat2) >= 0 &&
          stat1.st_dev == stat2.st_dev && stat2.st_ino == stat2.st_ino);
}

int main(void)
{
  printf("0/1: %d\n1/2: %d\n2/0: %d\n",same_tty_p(0,1),
         same_tty_p(1,2),same_tty_p(2,0));
  printf("stat %d bytes\n", sizeof(struct stat));
}

ford@fordpc ~
$ gcc -o stest stest.c

ford@fordpc ~
$ ./stest
0/1: 1
1/2: 1
2/0: 1
stat 96 bytes

$ nm stest.exe | grep fstat
00402970 T __fstat64
004060a4 I __imp___fstat64
004060e0 I __imp__fstat
004027a0 T _fstat

Make sure struct stat is 96 bytes and you are calling fstat64.

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FlightSafety International
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Fax:   314-551-8444

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Re: isatty bug

[Sam Steingold]

> * Brian Ford <sbeq@iff.sfv.pbz> [2003-09-16 14:22:33 -0500]:
>
> Was that stock Cygwin gdb that crashed?

yes, gdb 20030901-1

> $ cat stest.c
> #include <sys/types.h>
> #include <sys/stat.h>
> 
> int same_tty_p (int fd1, int fd2)
> {
>   struct stat stat1, stat2;
> 
>   return (fstat(fd1, &stat1) >= 0 && fstat(fd2, &stat2) >= 0 &&
>           stat1.st_dev == stat2.st_dev && stat2.st_ino == stat2.st_ino);
> }
> 
> int main(void)
> {
>   printf("0/1: %d\n1/2: %d\n2/0: %d\n",same_tty_p(0,1),
>          same_tty_p(1,2),same_tty_p(2,0));
>   printf("stat %d bytes\n", sizeof(struct stat));
> }
> 
> ford@fordpc ~
> $ gcc -o stest stest.c
> 
> ford@fordpc ~
> $ ./stest
> 0/1: 1
> 1/2: 1
> 2/0: 1
> stat 96 bytes
> 
> $ nm stest.exe | grep fstat
> 00402970 T __fstat64
> 004060a4 I __imp___fstat64
> 004060e0 I __imp__fstat
> 004027a0 T _fstat

i get the exact same output (but read on!):

15:57:15 /cygdrive/d/sds/c [74]$ gcc -o stest stest.c
15:57:21 /cygdrive/d/sds/c [75]$ ./stest
0/1: 1
1/2: 1
2/0: 1
stat 96 bytes
15:57:27 /cygdrive/d/sds/c [76]$ nm stest.exe | grep fstat
00402970 T __fstat64
004060a4 I __imp___fstat64
004060e0 I __imp__fstat
004027a0 T _fstat
15:57:40 /cygdrive/d/sds/c [77]$ gcc -g -o stest stest.c
15:58:05 /cygdrive/d/sds/c [78]$ ./stest
0/1: 1
1/2: 1
2/0: 1
stat 96 bytes
15:58:07 /cygdrive/d/sds/c [79]$ nm stest.exe | grep fstat
00402970 T __fstat64
004060a4 I __imp___fstat64
004060e0 I __imp__fstat
004027a0 T _fstat
15:58:10 /cygdrive/d/sds/c [80]$ gdb stest
GNU gdb 2003-09-02-cvs (cygwin-special)
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i686-pc-cygwin"...
(gdb) run
Starting program: /cygdrive/d/sds/c/stest.exe
0/1: 1
1/2: 1
2/0: 1
stat 96 bytes

Program exited with code 016.
(gdb) break main
Breakpoint 1 at 0x401138: file stest.c, line 17.
(gdb) run
Starting program: /cygdrive/d/sds/c/stest.exe

Breakpoint 1, main () at stest.c:17
17        printf("0/1: %d\n1/2: %d\n2/0: %d\n",same_tty_p(0,1),
(gdb) s
same_tty_p (fd1=0, fd2=1) at stest.c:11
11        return (fstat(fd1, &stat1) >= 0 && fstat(fd2, &stat2) >= 0 &&
(gdb) s
13      }
(gdb) p stat1
$1 = {st_dev = 65536, st_ino = 768719909725019470, st_mode = 8630,
  st_nlink = 1, st_uid = 13044, st_gid = 10513, st_rdev = 65536, st_size = 0,
  st_atim = {tv_sec = 1063742318, tv_nsec = 659000000}, st_mtim = {
    tv_sec = 1063742318, tv_nsec = 659000000}, st_ctim = {
    tv_sec = 1063742318, tv_nsec = 659000000}, st_blksize = 1024,
  st_blocks = 0, st_spare4 = {0, 0}}
(gdb) p stat2
$2 = {st_dev = 65536, st_ino = 5383573127766058053, st_mode = 8630,
  st_nlink = 1, st_uid = 13044, st_gid = 10513, st_rdev = 65536, st_size = 0,
  st_atim = {tv_sec = 1063742318, tv_nsec = 699000000}, st_mtim = {
    tv_sec = 1063742318, tv_nsec = 699000000}, st_ctim = {
    tv_sec = 1063742318, tv_nsec = 699000000}, st_blksize = 1024,
  st_blocks = 0, st_spare4 = {0, 0}}
(gdb) p fstat(fd1, &stat1)
Segmentation fault (core dumped)

it turned out that I needed to recompile the obj file that defined my
same_tty_p() - of course.  how silly of me!  [now, I think I was told
that everything was binary backwards compatible; I guess I was confused]
now that I did it -- my scratch.c works just like your stest.c.
good.

now, why does GDB crash?

-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
<http://www.mideasttruth.com/> <http://www.honestreporting.com>
All extremists should be taken out and shot.


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Re: isatty bug

[Brian Ford]

Sam Steingold wrote:

> it turned out that I needed to recompile the obj file that defined my
> same_tty_p() - of course.  how silly of me!  [now, I think I was told
> that everything was binary backwards compatible; I guess I was confused]
> now that I did it -- my scratch.c works just like your stest.c.
> good.
>
Executables (and DLLs) are binary backwards compatible.  Static libs
and objects are not.  The 64 bit translation happens at link time.

> (gdb) p fstat(fd1, &stat1)
> Segmentation fault (core dumped)
>
> now, why does GDB crash?
>
Maybe because gdb actually calls fstat instead of fstat64 since it doesn't
get the magic link time redirection?  No idea really.

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
Phone: 314-551-8460
Fax:   314-551-8444

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Re: isatty bug

[Christopher Faylor]

On Tue, Sep 16, 2003 at 03:53:07PM -0500, Brian Ford wrote:
>>(gdb) p fstat(fd1, &stat1)
>>Segmentation fault (core dumped)
>>
>>now, why does GDB crash?
>>
>Maybe because gdb actually calls fstat instead of fstat64 since it doesn't
>get the magic link time redirection?  No idea really.

The current version of gdb just can't call functions from the prompt.  I
just fixed this recently.  It was a gdb bug.  I'm having a hard time
regenerating gdb from cvs recently, otherwise, I'd have a new update
out.

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