Of 'shm_open' undefined reference

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Compile error:

Of 'shm_open' undefined reference

the reason:

General cause of the error is caused no link library

Solution:

In compiling the final add -lrt

E.g:

gcc -o test test.c -lrt

The last few lines of man shm_open Help file:

NOTES

       These functions are provided in glibc 2.2 and  later.   Programs  using

       these  functions  must  specify  the  -lrt  flag to cc in order to link

       against the required ("realtime") library.