[rsf-user] Debugging using gdb with I/O redirection

[O'Donnell, T. (S. US) <tom...@si...>]

Dear All,

I am trying to debug a simple program, sfsegyheader,  using gdb  (I recompiled  Madagascar using  gcc with the -g option)

gdb sfsegyheader < plane.rsf tracl=tracl.rsf > tfile.rsf

$ gdb sfsegyheader
(gdb) run < filter.rsf tracl=tracl.rsf > tfile.rsf

Starting program: /usr/local/rsf/bin/bin/sfsegyheader < filter.rsf tracl=tracl.r
sf > tfile.rsf
[New Thread 3360.0x17ac]
[New Thread 3360.0x1668]

And it hangs..........

If I run it from the console I get:
$ sfsegyheader < filter.rsf tracl=tracl.rsf > tfile.rsf
sfsegyheader: Need filesize=1Segmentation fault (core dumped)

Different results.


I think the problem is  that gdb is not recognizing the stdin redirection to filter.rsf. It thinks that stdin is still stdin.

Specifically, in simtab.c
void sf_simtab_input (sf_simtab table, FILE* fp, FILE* out)
/*< extract parameters from a file >*/
{
    char line[LINELEN], word[LINELEN], *cl, *cw;
    int c;
    enum {START, INAWORD, STRING} state;

    while (NULL != fgets(line,4,fp)) {

It seems to be waiting here for input from the console.



What am I doing wrong? Or alternatively, how do people debug these programs?

Thanks,
Tom