Constants not loaded by compiler

Question

I started studying POSIX timers, so I started also doing some exercises, but I immediately had some problems with the compiler. When compiling this code, I get some strange

Answer 1

If you are using -std=c99 you need to tell gcc you're still using recent versions of POSIX:

#define _POSIX_C_SOURCE 199309L

before any #include, or even with -D on the command line.

Other errors:

• Missing #include
• You need a pointer for timer_create, i.e. &sigeventStruct instead of just sigeventStruct