Eroare de compilare: user.c: In function ‘main’: user.c:32:2: warning: implicit declaration of function ‘ftruncate’ [-Wimplicit-function-declaration] if(ftruncate(memo,memo_size)==-1) ^ user.c:65:6: warning: unused variable ‘copil’ [-Wunused-variable] int copil=wait(NULL); ^ user.c:16:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d" ,&n); ^ user.c:19:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ /tmp/ccWTNOVM.o: In function `main': user.c:(.text.startup+0xb8): undefined reference to `shm_open' user.c:(.text.startup+0x26e): undefined reference to `shm_unlink' collect2: error: ld returned 1 exit status