ESP32 Forum

Hi,

A third party library that we are planning to use has a dependency to signal.h.

I have found that the ESP-IDF has this header file,
https://github.com/espressif/esp-idf/bl ... e/signal.h
https://github.com/espressif/esp-idf/bl ... s/signal.h

During compilation we get this error,
undefined reference to `signal'

The header file is included as: #include <signal.h>

Code snippet: We are using the release/v3.2 branch of ESP-IDF.

Hi PatrikB,

Unfortunately there are some standard libc headers in newlib for some features which are not supported in ESP-IDF. ESP-IDF and FreeRTOS has no concept of POSIX signal handlers, so code which calls signal() will not work.

I'm afraid you'll have to refactor the third party code so it doesn't require sending/receiving signals.

Angus

Ok, then i know .

Thanks for your reply.