spawnl and mode commands

Question

I want to use spawnl to restore a DOS terminal session after my application has completed, I'm doing the following:

    static char* pszMode = "mode.com";
    int intRC = spawnl(P_WAIT, pszMode, pszMode, "co80", NULL);
    char szCOM2setup[80];
    sprintf(szCOM2setup, "%s:9600,n,8,1", clsPort::mpcszCOM2);
    intRC = spawnl(P_WAIT, pszMode, pszMode, szCOM2setup, NULL);

mpcszCOM contains COM2

In both cases intRC contains -1, I've single stepped execution and it doesn't look like these commands are being properly executed, what haven't I done?

I'm using ROM-DOS version 6.22 on an embedded PC104 platform.

I've checking with perrror and using strError, the actual error is:

    No such file or directory

But why? The path is set-up before the application is launched and mode.com is accessible from the command line in the same folder as the application.

Tried using spawnlp instead of spawnl, no better same error.

Do the `spawnl` function set `errno` when they fail (return `-1`)? Have you checked what `errno` is on failure (perhaps by using [`perror`](http://en.cppreference.com/w/c/io/perror))? — Some programmer dude, Jul 10 '17 at 13:53
I don't know. Error numbers are not part of the C++ specification. Use `perror` to print a readable string about the error. — Some programmer dude, Jul 10 '17 at 14:04
You can use `strerror` to *get* a printable string that you print. Or you use `perror` which *prints* the string directly (to `stderr`). Either way is fine to know a little more about what's going on. — Some programmer dude, Jul 10 '17 at 14:07

score 0 · Accepted Answer · answered Jul 10 '17 at 14:54

0

For a reason I don't understand even though the path is set-up correctly, the application was returning "No such file or directory" so I modified the application to include the path and this resolved the issue.

answered Jul 10 '17 at 14:54

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spawnl and mode commands

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