what's the meaning of ::system in Linux Embedded Arm?

Asked Apr 08 '20 at 07:49

Active Apr 08 '20 at 15:31

Viewed 31 times

I'm checking a snippet made in Qt fo embedded, that allow to set the serial port parameter. Its not clear the meaning of the following instruction: I understand it sets communication parameter, but I don't understand "::system" (probably the launch of an external command?) and the possible values variable "ret" could assume:

    int ret=::system( RS232_1_SET="stty -F /dev/ttymxc1 230400 parodd -cstopb cs8 -echo");

Does anyone could explain it in a detailed way OR give me some link to the related sintax?

Thanks

Paolo

edited Apr 08 '20 at 15:31

artless noise

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asked Apr 08 '20 at 07:49

LittleSaints

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https://en.cppreference.com/w/cpp/utility/program/system – vermaete Apr 08 '20 at 07:52
In C++ a symbol like `::symbol` means it is in the [global namespace](https://stackoverflow.com/search?q=%5Bc%2B%2B%5D+global+namespace). – artless noise Apr 08 '20 at 15:31

what's the meaning of ::system in Linux Embedded Arm?

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