Hi.
There is a bug in G_list_element or G_popen, if GRASS_PAGER
enviroment variable is not set g.list prints nothing because
G_popen returns some a pipe (what pipe if cmd is empty?) instead of NULL.
Try
unset GRASS_PAGER
g.list rast
Radim
Radim Blazek wrote:
There is a bug in G_list_element or G_popen, if GRASS_PAGER
enviroment variable is not set g.list prints nothing because
G_popen returns some a pipe (what pipe if cmd is empty?) instead of NULL.
If GRASS_PAGER isn't set, that's a bug in the startup.
Note that G_popen() doesn't use popen(), but contains its own
implementation using pipe/fork/exec. If the command fails, you will
still get the pipes; there just won't be a process on the other end of
them (technically, there will be a zombie process, which will be
reaped by G_pclose()).
If you need to handle GRASS_PAGER not being set, the most
straightforward solution would be something like:
if (!getenv("GRASS_PAGER"))
putenv("GRASS_PAGER=cat");
[What to use on Windows? "type" requires a filename.]
--
Glynn Clements <glynn@gclements.plus.com>