Moxa Technologies UC-7110 Uživatelský manuál stáhnout pdf (Strana 46)

Appendix C FAQ

FAQ 1 Why am I only able to use vfork ( ),and cannot use fork ( )?

Answer 1 μClinux only supports vfork ( ). It does not support fork ( ). Note that when using

vfork ( ), the parent process will hang until the child process calls an exec group API,

or exits.

FAQ 2 When using a pthread group API, why can I not use SIGUSR1 and SIGUSR2?

Answer 2 We cannot use the SIGUSR1 and SIGUSR2 signals since a pthread group API uses

SIGUSR1 and SIGUSR2 to do a pthread control suspend, restart exit function. You

will get the same result if you link the pthread. This means that you cannot use

-1pthread to add an option to the linker.

FAQ 3 What is the correct format for linking to an API?

Answer 3 arm-elf-gcc –W1, -elf2flt

(In this example, the API converts elf format to flat format.)

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Moxa Technologies UC-7110 Uživatelský manuál Strana 46