[PATCH] Use exec_file_find to prepend gdb_sysroot in follow_exec

[Pedro Alves]

On 04/17/2015 02:28 PM, Gary Benson wrote:
> Hi all,
> 
> This commit updates follow_exec to use exec_file_find to prefix
> the new executable's filename with gdb_sysroot rather than doing
> it longhand.
> 
> Built and regtested on RHEL6.6 x86_64.
> 
> Ok to commit?

OK.

> -  if (gdb_sysroot && *gdb_sysroot)
> +  if (gdb_sysroot != NULL && *gdb_sysroot != '\0')
>      {
> -      char *name = alloca (strlen (gdb_sysroot)
> -			    + strlen (execd_pathname)
> -			    + 1);
> +      int fd = -1;
> +      char *name;
>  
> -      strcpy (name, gdb_sysroot);
> -      strcat (name, execd_pathname);
> -      execd_pathname = name;
> +      name = exec_file_find (execd_pathname, &fd);
> +      if (fd >= 0)
> +	close (fd);

We now have at least two places that need to remember to call
close.  IWBN if we hid that close in a exec_file_find variant, so
that callers didn't have to recall to do it.  Maybe
rename exec_file_find to (e.g.) exec_file_find_fd and reuse
the exec_file_find name, even.

Thanks,
Pedro Alves