[U-Boot-Users] Capture of the returned value in cmdline

[U-Boot-Users] Capture of the returned value in cmdline

[do]

Hello,
Is this possible to capture value returned by the function, which 
implement some command (for example do_printenv),
from commandline in u-boot and for example write it to some shell variable?
Is this also possible with standalone programs like examples/hello_world.c?


By the way, what is the usage/application of the flag argument in 
command function declaration, for example:
int do_printenv(cmd_tbl_t * cmdtp, int flag, int argc, char * argv[]);

Best regards!

[U-Boot-Users] Capture of the returned value in cmdline

[Wolfgang Denk]

In message <dscm94$ovq$1@sea.gmane.org> you wrote:
>
> Is this possible to capture value returned by the function, which 
> implement some command (for example do_printenv),
> from commandline in u-boot and for example write it to some shell variable?

No, but you can evaluate the return code (especially if  you  enabled
the HUSH shell as command line parser).

> Is this also possible with standalone programs like examples/hello_world.c?

Same here.

> By the way, what is the usage/application of the flag argument in 
> command function declaration, for example:
> int do_printenv(cmd_tbl_t * cmdtp, int flag, int argc, char * argv[]);

See do_run() and run_command() in common/main.c

Best regards,

Wolfgang Denk

-- 
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