How to detect sd card insert/removal in user space code

[Dhevan]

Hi,

      We are using imx8m mini evk board.

      SD card auto mounting is working fine.

      But we want user space code detect to detect sd card insertion and removal.

      Ubuntu i have tried netlink(libnl) suite https://www.infradead.org/~tgr/libnl/doc/core.html but not able to find proper apis.

      Please help us solve the issue.

Thanks & Regards,

       Vasu

[b36401]

I can suggest to grep /var/log/messages for messages related to SD card.
I mean something like this:
[ 542.576330] mmc1: card 59b4 removed
and this:
[ 570.761873] mmc1: new high speed SDHC card at address 59b4

[Dhevan]

Hi @b36401,

     We want to detect user space c/c++ code.

     Do you have any suggestion detecting in user space c/c++ code ?

Thanks & Regards,

        Vasu

[b36401]

Another way (that may be more useful for C code) is to check if /dev/mmcblk1 appears.
I mean that the code may periodically check /dev/mmcblk1 filesystem entry for existing.