There is a mknod system call in Fig. 1-16 but there is no rmnod call. Does this mean that you have to be very, very careful about making nodes this way because there is no way to every remove them?

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Address OxFFFFFFFF User space Kernel space (Operating system) 6 Return to caller Trap to the kernel 5 Put code for read in register Increment SP 11 - Call read 3 Push fd 2 1 Push &buffer Push nbytes Dispatch 7 8 10/ Sys call handler 6 Library procedure read User program calling read Figure 1-16. The 11 steps in making the system call read(fd, buffer, nbytes).