Eroare de compilare: user.c: In function ‘main’: user.c:37:2: warning: implicit declaration of function ‘ftruncate’ [-Wimplicit-function-declaration] if(ftruncate(mem,mem_size)) ^ user.c:15:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.c:21:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ /tmp/cctg8Vqn.o: In function `main': user.c:(.text.startup+0xe3): undefined reference to `shm_open' user.c:(.text.startup+0x18f): undefined reference to `shm_unlink' user.c:(.text.startup+0x1a9): undefined reference to `shm_unlink' user.c:(.text.startup+0x2dd): undefined reference to `shm_unlink' collect2: error: ld returned 1 exit status