Reg SEGV

Reg SEGV

[Vivek Katakam]

Hi all,

I am recieving segmentation fault at the following line :
 vfprintf(output_file, input_msg, allargs);

when run in gdb I am getting this:
 847             vfprintf(output_file, input_msg, allargs);
 (gdb) p output_file
 $1 = (FILE *) 0x504750
 (gdb)  p input_msg
 $2 = 0x2a9588fdc8 "schema to %s: %d %*s\n"
 (gdb) p allargs
 $3 = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7fbffb2428,
 reg_save_area = 0x7fbffb2350}}
(gdb)

Regards,
 Vivek


I want to know what is wrong with the code.

Regards,
 Vivek

Re: Reg SEGV

[Andrew Haley]

Vivek Katakam writes:
 > 
 > I am recieving segmentation fault at the following line :
 >  vfprintf(output_file, input_msg, allargs);
 > 
 > when run in gdb I am getting this:
 >  847             vfprintf(output_file, input_msg, allargs);
 >  (gdb) p output_file
 >  $1 = (FILE *) 0x504750
 >  (gdb)  p input_msg
 >  $2 = 0x2a9588fdc8 "schema to %s: %d %*s\n"
 >  (gdb) p allargs
 >  $3 = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7fbffb2428,
 >  reg_save_area = 0x7fbffb2350}}
 > (gdb)
 > 
 > I want to know what is wrong with the code.

We don't know because you didn't post the code.  Post the code and
we'll tell you.

Andrew.

Re: Reg SEGV

[John Love-Jensen]

Hi Vivek,

> I want to know what is wrong with the code.

Probably one of the parameters does not jibe with the % specifier in the
format string.

Just a guess, though, since you did not post the code.

--Eljay

Re: Reg SEGV

[Vivek Katakam]

Hi John,

I am actually working on a proc file and when i am running it I am
getting the error.

The code is in a file called vaprintf.c

These are the Lines of code from where the error came.
 /* Write out the message to the file. */
        va_start(args, input_msg);
        #ifdef LINUX
        va_copy(allargs,args);
        #else
        allargs=args;
        #endif
        vfprintf(output_file, input_msg, args);
        va_end(args);

        fputc('\n', output_file);
        fflush(output_file);
        return_value = ML_LOGGING_MESSAGE_LOGGED;

        va_end(args);

Regards,
Vivek


Reading specs from /usr/lib/gcc-lib/x86_64-redhat-linux/3.2.3/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--host=x86_64-redhat-linux
Thread model: posix
gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-53)

On 5/12/06, John Love-Jensen <eljay@adobe.com> wrote:
> Hi Vivek,
>
> > I want to know what is wrong with the code.
>
> Probably one of the parameters does not jibe with the % specifier in the
> format string.
>
> Just a guess, though, since you did not post the code.
>
> --Eljay
>
>

Re: Reg SEGV

[Andrew Haley]

Vivek Katakam writes:

 > I am actually working on a proc file and when i am running it I am
 > getting the error.
 > 
 > The code is in a file called vaprintf.c
 > 
 > These are the Lines of code from where the error came.
 >  /* Write out the message to the file. */
 >         va_start(args, input_msg);
 >         #ifdef LINUX
 >         va_copy(allargs,args);
 >         #else
 >         allargs=args;
 >         #endif
 >         vfprintf(output_file, input_msg, args);
 >         va_end(args);
 > 
 >         fputc('\n', output_file);
 >         fflush(output_file);
 >         return_value = ML_LOGGING_MESSAGE_LOGGED;
 > 
 >         va_end(args);

Why are you calling va_end() twice?  This is wrong.

You still haven't given us enough code.  In particular you haven't
show us the args that get passed to this function.  You haven't even
shown us all of this function.

Andrew.