bad file pointer from fopen

[Robert Ambrose]

I'm not sure why you think you have a bad file pointer.  FWIW, unless you
have the library source, it isn't much use stepping into a library
function.

rna

On Thu, 18 Apr 2002, lynn tilby wrote:

>
> I am receiving a bad file pointer from fopen.
>
> The permissions on the foo_data (input) file are 777,
> owner is the person executing the compiled code, the code is
> being executed in the same dir as the foo_data file.
>
> The interesting thing is that fopen is NOT returning a NULL
> file pointer.  The program continues on and gives the message
> of successfully opening foo_data.  In the real (non-example)
> code the prog eventually core dumps on the fread.
>
> gcc version is:
> Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
> gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
>
> Here is the sample code:
> #include <stdio.h>
> FILE *in_ptr, *fopen();
:> main()
> {
>   if((in_ptr = fopen ( "./foo_data" , "r")) == NULL)
>   {
>     printf("\nfopen failed on foo_data\n\n");
>     exit(1);
>   }
>   printf("\nfopen successful on foo_data\n\n");
> }
>
> Here is the xxgdb output:
> Breakpoint 1, 0x804838c in fopen ()
> (xxgdb) step
> Single stepping until exit from function fopen,
> which has no line number information.
> _IO_new_fopen (filename=0x8048522 "./foo_data", mode=0x8048520 "r") at
> iofopen.c:42
> 42    iofopen.c: No such file or directory.
> (xxgdb)
>
> ANY THOUGHTS??????
>
> Thanks for you response!
> Lynn
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