Appendix C. Solutions to Selected Exercises

	Example	Relevant Functions
C.1	notatty.c Demonstrate bad interaction between errno and printf. Prints errno=25 (ENOTTY) when stdout is redirected into a file.	open, printf, isatty (implied)
C.2	longpath.c Create a deep directory tree Show getcwd(3C) system limits.	mkdir, chdir, creat, getcwd, path_alloc, realloc
C.3	getpwsvr4.c Print encrypted password under SVR4.	getspnam
C.4	getpw44bsd.c Print encrypted password under 4.3+BSD	getpwnam
C.5	prtime.c Print date/time. Similar to date(1)	time, localtime, strftime
C.6	vfork3.c Incorrect use of vfork: Child overwrites parent stack area.	vfork (not under IRIX)
C.7	zombie.c Create a zombie process Watch ps(1) show it.	fork, err_sys (Stevens' lib), sleep, system, exit
C.8	raise Implementation of the raise(3C) function.	getpid, kill
C.9	lib.sun/sleepus.c Implementation of uSec sleep using select.	select
C.10	lib.svr4/sleepus.c Implementation of uSec sleep using poll.	poll
C.11	selectpipe.c Calculation of pipe-capacity using select.	select pipe, err_sys (Stevens' lib), FD_ZERO, FD_SET, write, printf, exit
C.12	sess/tdaemon2.c Call daemon_init (background, detached from tty process) and then try to obtain the login name (w/o a controlling tty) May not work in certain environments.	daemon_init (see 13.1), close, getlogin, sprintf, write, exit
C.13	ipc/fifo1.c Opening a FIFO for read/write without blocking.	unlink, mkfifo, open, err_sys (Stevens' lib), clr_fl (Stevens' lib), exit