Eroare de compilare: user.c: In function ‘main’: user.c:394:53: error: ‘S_IRWXU’ undeclared (first use in this function) fd2 = open("royfloyd.out", O_CREAT|O_RDWR|O_TRUNC, S_IRWXU); ^ user.c:394:53: note: each undeclared identifier is reported only once for each function it appears in user.c: In function ‘ft_putchar_fd’: user.c:22:7: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] write(fd, &c, 1); ^ user.c: In function ‘ft_putchar’: user.c:66:7: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] write(1, &c, 1); ^